Transverse Energy-Energy Correlation on Hadron Collider. Deutsches Elektronen-Synchrotron

Size: px
Start display at page:

Download "Transverse Energy-Energy Correlation on Hadron Collider. Deutsches Elektronen-Synchrotron"

Transcription

1 Transverse Energy-Energy Correlation on Hadron Collider Wei Wang ( 王伟 ) Deutsches Elektronen-Synchrotron Work with Ahmed Ali, Fernando Barreiro, Javier Llorente arxiv: , Phys.Rev. D86, (2012)

2 Content Introduction Energy-Energy + e - collision Transverse hadron collider Results at LHC with s=7tev Transverse EEC jet algorithm trigger efficiency Dependence on PDF, scale Impact on α s measurement Summary and outlook

3 QCD n Quantum Chromodynamics (QCD), the gauge field theory that describes the strong interactions of colored quarks and gluons, is the SU(3) component of the SU(3) SU(2) U(1) Standard Model of Particle Physics.

4 QCD n Quantum Chromodynamics (QCD), the gauge field theory that describes the strong interactions of colored quarks and gluons, is the SU(3) component of the SU(3) SU(2) U(1) Standard Model of Particle Physics. 0.5 s (Q) July 2009 Deep Inelastic Scattering e + e Annihilation Heavy Quarkonia -decays (N3LO) Quarkonia (lattice) decays (NLO) DIS F 2 (N3LO) DIS jets (NLO) QCD s( Z) = ± Q [GeV] e + e jets & shps (NNLO) electroweak fits (N3LO) e + e jets & shapes (NNLO) s ( Z)

5 Jet event shape n Event-shape variables are functions of the four momenta in the hadronic final state that characterize the topology of an event s energy flow. They are sensitive to QCD radiation (and correspondingly to the strong coupling) insofar as gluon emission changes the shape of the energy flow. data / theory s = 300 GeV s = 318 GeV s = 546 GeV inclusive jet production in hadron-induced processes CDF 0.1 < y < 0.7 s = 630 GeV DØ y < 0.5 s = 1800 GeV CDF 0.1 < y < 0.7 DØ 0.0 < y < 0.5 DØ 0.5 < y < 1.0 s = 1960 GeV CDF cone algorithm CDF k T algorithm ( 400) ( 100) DIS ( 35) s = 200 GeV ( 16) STAR 0.2 < y < 0.8 fastnlo hepforge.cedar.ac.uk/fastnlo pp H1 150 < Q 2 < 200 GeV 2 H1 200 < Q 2 < 300 GeV 2 H1 300 < Q 2 < 600 GeV 2 H1 600 < Q 2 < 3000 GeV 2 ZEUS 125 < Q 2 < 250 GeV 2 ZEUS 250 < Q 2 < 500 GeV 2 ZEUS 500 < Q 2 < 1000 GeV 2 ZEUS 1000 < Q 2 < 2000 GeV 2 ZEUS 2000 < Q 2 < 5000 GeV 2 ( 6) pp-bar ( 3) ( 1) all pqcd calculations using NLOJET++ with fastnlo: s (M Z )=0.118 CTEQ6.1M PDFs µ r = µ f = p T jet NLO plus non-perturbative corrections pp, pp: incl. threshold corrections (2-loop) p T (GeV/c) PDG live

6 Jet event shape: energy-energy correlation n Event-shape variables are functions of the four momenta in the hadronic final state that characterize the topology of an event s energy flow. They are sensitive to QCD radiation (and correspondingly to the strong coupling) insofar as gluon emission changes the shape of the energy flow.

7 Jet event shape: energy-energy correlation n Event-shape variables are functions of the four momenta in the hadronic final state that characterize the topology of an event s energy flow. They are sensitive to QCD radiation (and correspondingly to the strong coupling) insofar as gluon emission changes the shape of the energy flow. n Energy-energy correlation (EEC): energy-weighted angular distributions

8 + e - : state of the art Energy-energy correlation, EEC EEC 1 DELPHI data Dipole Shower Dipole Shower + NLO When two jets are parallel, large logarithms will be generated. MC/data cos χ S. Platzer, S. Gieseke, NLO/NLL matching in matchbox method

9

10 Transverse EEC at Hadron collider Normalized Transverse EEC: v boost invariant v Almost independent of structure functions

11 Transverse EEC at Hadron collider Ali, Pietarinen, Stirling Phys. Lett. B 141, 447 (1984). parton level: not realistic results leading order in α s collision energy at 540 GeV We will use the state-of-the-art PDFs, include the next-toleading order corrections and compute the transverse EEC at hadron collider (LHC and Tevatron)!

12 Jet algorithm

13 Jet algorithm: definition of jet

14 Jet algorithm anti-kt algorithm first handle energetic particles and then soft anti-kt algorithm is more cone-like Cacciari,Salam,Soyez,

15 ATLAS detector efficiency ATLAS note: ATL-COM- PHYS Detector efficiency is very high. But most events will be rejected.

16 Monte Carlo simulation predictions of the DGLAP-based MC generators PYTHIA6, of CASCADE and HEJ+ARIADNE which incorporate element band indicates the size of the total systematic uncertainty are smaller than the symbol sizes. Because of limitations in possible to obtain a reliable prediction for Dy > 8. Event generators: PYTHIA, Herwig++, WHIZARD, Sherpa incl R data PYTHIA6 Z2 PYTHIA8 4C HERWIG++ UE-7000-EE-3 HEJ + ARIADNE CASCADE CMS, pp, p T s = 7 TeV dijets > 35 GeV y < data PYTHIA6 Z2 PYTHIA8 4C HERWIG++ UE-7000-EE-3 HEJ + ARIADNE CASCADE MC / data CMS: CMS, pp, s = 7 TeV 1.5 data dijets 1.4 PYTHIA6 Z2 p > 35 GeV T y PYTHIA8 < 4.7 4C 1.3 HERWIG CMS, pp, s = 7 TeV incl dijets, R p > 35 GeV T y < 4.7 MC / data !y!y Figure 2: Predictions for R Figure 1: Ratios of the inclusive to exclusive dijet cross sections as a function of the rapidity incl (left) and R MN (right) from separation Dy between the two jets, R incl (left panel) and R MN sented as ratio to data corrected for detector effects. Both BF (right panel), compared to the predictionsratios of the DGLAP-based of the inclusive MC generators to exclusive PYTHIA6, dijet PYTHIA8 cross and andsections HEJ+ARIADNE HERWIG++, as (not shown) lead to a MC/data ratio w as well as of CASCADEa and function HEJ+ARIADNE of the which rapidity incorporate separation elements of of the two indicates BFKLjets: the size of the total systematic uncertainty of the approach. The shaded are shown as bars. band indicates PYTHIA the sizecan of the well total describe systematicthe uncertainty data. of the data. Statistical uncertainties are smaller than the symbol sizes. Because of limitations in the CASCADE generator it was not possible to obtain a reliable prediction for Dy > 8.

17 Monte Carlo simulation: E T distribution 4 10 sumet sumet Entries Mean RMS

18 Monte Carlo simulation: Jet multiplicity jetn jetn Entries Mean RMS Processes with more than four jets in the final state are suppressed.

19 Small angle vs large angle region 10 Red: R=0.6 Blue: R= EEC In endpoint region, large logarithms are produced, and have to be resummed. The small angle region is also correlated with the jet algorithm size R The NLO results are valid only in the intermediate region, Cos(phi) <0.8

20 Small angle vs large angle region EEC Asymmetry

21 NLOJET++ NLOJET++ is a C++ code for calculating LO and NLO order cross section on at e + e -, DIS and hadron collider, written by Zoltan Nagyz a bug in 6q interaction is fixed We modify NLOJET++ and use anti-k T algorithm. Two PDFs: MSTW and CT inclusive jet production in hadron-induced processes ( 400) s = 200 GeV STAR 0.2 < y < 0.8 fastnlo hepforge.cedar.ac.uk/fastnlo pp pt> 25 GeV pt1+pt2>500 GeV y <2.5 R=0.4 default scale choice data / theory For NLO results, we have generated events s = 300 GeV s = 318 GeV s = 546 GeV CDF 0.1 < y < 0.7 s = 630 GeV DØ y < 0.5 s = 1800 GeV CDF 0.1 < y < 0.7 DØ 0.0 < y < 0.5 DØ 0.5 < y < 1.0 s = 1960 GeV CDF cone algorithm CDF k T algorithm ( 100) DIS ( 35) ( 16) H1 150 < Q 2 < 200 GeV 2 H1 200 < Q 2 < 300 GeV 2 H1 300 < Q 2 < 600 GeV 2 H1 600 < Q 2 < 3000 GeV 2 ZEUS 125 < Q 2 < 250 GeV 2 ZEUS 250 < Q 2 < 500 GeV 2 ZEUS 500 < Q 2 < 1000 GeV 2 ZEUS 1000 < Q 2 < 2000 GeV 2 ZEUS 2000 < Q 2 < 5000 GeV 2 ( 6) pp-bar ( 3) ( 1) all pqcd calculations using NLOJET++ with fastnlo: s (M Z )=0.118 CTEQ6.1M PDFs µ r = µ f = p T jet NLO plus non-perturbative corrections pp, pp: incl. threshold corrections (2-loop) p T (GeV/c)

22 Transverse EEC at Hadron collider (1/σ) dσ/d(cos φ) LO Prediction, MSTW2008 PDF LO Prediction, CT10 PDF (1/σ) dσ/d(cos φ) NLO Prediction, MSTW2008 PDF NLO Prediction, CT10 PDF cos φ PDF dependence: the PDF-related differences on the transverse EEC are negligible, with the largest difference found in some bins amounting to 3%. cos φ

23 Transverse EEC at Hadron collider (1/σ) dσ/d(cos φ) max LO Prediction, µ = µ = E F R T max LO Prediction, µ = µ = E T /2 F R max LO Prediction, µ = µ = 2E F R T cos φ (1/σ) dσ/d(cos φ) max NLO Prediction, µ = µ = E F R T max NLO Prediction, µ = µ = E T /2 F R max NLO Prediction, µ = µ = 2E F R T cos φ Scale dependence is significantly reduced when NLO corrections are taken into account.

24 Transverse EEC at Hadron collider EEC K-factor (1/σ) dσ/d(cos φ) (a) LO Prediction NLO Prediction Pythia Prediction K-Factor NLO / LO NLO / Pythia (c) cos φ cos φ Effects of the NLO corrections are discernible, both compared to the LO and PYTHIA8. The NLO corrections distort the shape of the transverse EEC.

25 Transverse EEC at Hadron collider Transverse EEC asymmetry is defined as 1 d asy d 1 d d 1 d d /d(cos φ) asym (1/σ) dσ (b) LO Prediction NLO Prediction Pythia Prediction cos φ

26 Transverse EEC at Hadron collider (1/σ) dσ/d(cos φ) (a) NLO Prediction, α s = 0.11 NLO Prediction, α s = 0.12 NLO Prediction, α s = 0.13 /d(cos φ) asym (1/σ) dσ (b) NLO Prediction, α s = 0.11 NLO Prediction, α s = 0.12 NLO Prediction, α s = cos φ cos φ

27 Transverse EEC at Hadron collider Integrated transverse EEC asymmetry with the dependence on α s where we have symmetrized the dominant uncertainty from the scale-variance. B. Malaescu, P. Starovoitov arxiv:

28 Summary Jets and event shapes are useful tools to test QCD We explored the transverse EEC at hadron collider v boost invariant v Almost independent of structure functions v Show low sensitivity to scale v Do not depend on modeling underlying events v Preserve sensitivity to α s These measurements will prove to be powerful techniques for the quantitative tests of perturbative QCD using event shape variables and in the measurement of α s in hadron colliders.

29 OutLook Collisions with various choices of inputs Comparison with the available data Njet: S. Badger, B. Biedermann, P. Uwer, V. Yundin Back-to-back and collinear region: have to deal with large logarithms resummation effects in collaboration with Eduard Kuraev Matchbox within Herwig++:Judith Katzy, Jan Kotanski and Simon Plaetzer Thank you for your attention!

30

31 Current results for α s at hadron collider B. Malaescu and P. Starovoitov

Results from D0: dijet angular distributions, dijet mass cross section and dijet azimuthal decorrelations

Results from D0: dijet angular distributions, dijet mass cross section and dijet azimuthal decorrelations Results from D: dijet angular distributions, dijet mass cross section and dijet azimuthal decorrelations Zdenek Hubacek Czech Technical University in Prague E-mail: zdenek.hubacek@cern.ch on behalf of

More information

Precision QCD at the Tevatron. Markus Wobisch, Fermilab for the CDF and DØ Collaborations

Precision QCD at the Tevatron. Markus Wobisch, Fermilab for the CDF and DØ Collaborations Precision QCD at the Tevatron Markus Wobisch, Fermilab for the CDF and DØ Collaborations Fermilab Tevatron - Run II Chicago Ecm: 1.8 1.96 TeV more Bunches 6 36 Bunch Crossing 3500 396ns CDF Booster Tevatron

More information

Recent QCD results from ATLAS

Recent QCD results from ATLAS Recent QCD results from ATLAS PASCOS 2013 Vojtech Pleskot Charles University in Prague 21.11.2013 Introduction / Outline Soft QCD: Underlying event in jet events @7TeV (2010 data) Hard double parton interactions

More information

Transverse Energy-Energy Correlations in Next-to-Leading Order in α s at the LHC

Transverse Energy-Energy Correlations in Next-to-Leading Order in α s at the LHC Transverse Energy-Energy Correlations in Next-to-Leading Order in α s at the LHC Deutsches Elektronen-Synchrotron DESY, D-2267 Hamburg, Germany E-mail: ahmed.ali@desy.de This contribution summarizes the

More information

Multi-jet production and jet correlations at CMS

Multi-jet production and jet correlations at CMS Multi-jet production and jet correlations at Gábor I. Veres on behalf of the Collaboration CERN E-mail: gabor.veres@cern.ch Hadronic jet production at the LHC is an excellent testing ground for QCD. Essential

More information

Determination of the strong coupling constant from multi-jet production with the ATLAS detector

Determination of the strong coupling constant from multi-jet production with the ATLAS detector Determination of the strong coupling constant from multi-jet production with the ATLAS detector WNPPC 22 Marc-André Dufour McGill University February 22 Marc-André Dufour February 22 Determination of strong

More information

Tests of QCD Using Jets at CMS. Salim CERCI Adiyaman University On behalf of the CMS Collaboration IPM /10/2017

Tests of QCD Using Jets at CMS. Salim CERCI Adiyaman University On behalf of the CMS Collaboration IPM /10/2017 Tests of QCD Using Jets at CMS Salim CERCI Adiyaman University On behalf of the CMS Collaboration IPM-2017 24/10/2017 2/25 Outline Introduction QCD at LHC QCD measurements on the LHC data Jets The strong

More information

Two Early Exotic searches with dijet events at ATLAS

Two Early Exotic searches with dijet events at ATLAS ATL-PHYS-PROC-2011-022 01/06/2011 Two Early Exotic searches with dijet events at ATLAS University of Toronto, Department of Physics E-mail: rrezvani@physics.utoronto.ca This document summarises two exotic

More information

Miguel Villaplana Università degli Studi e INFN Milano. on behalf of the ATLAS Collaboration. September 11, 2017

Miguel Villaplana Università degli Studi e INFN Milano. on behalf of the ATLAS Collaboration. September 11, 2017 Measurement of photon (also +jets) production cross sections, jets production cross sections and extraction of the strong coupling constant ISMD2017 Tlaxcala City, Mexico Miguel Villaplana Università degli

More information

QCD and jets physics at the LHC with CMS during the first year of data taking. Pavel Demin UCL/FYNU Louvain-la-Neuve

QCD and jets physics at the LHC with CMS during the first year of data taking. Pavel Demin UCL/FYNU Louvain-la-Neuve QCD and jets physics at the LHC with CMS during the first year of data taking Pavel Demin UCL/FYNU Louvain-la-Neuve February 8, 2006 Bon appétit! February 8, 2006 Pavel Demin UCL/FYNU 1 Why this seminar?

More information

Recent Results on Jet Physics and α s

Recent Results on Jet Physics and α s Recent Results on Jet Physics and α s XXI Physics in Collision Conference Seoul, Korea June 8, Presented by Michael Strauss The University of Oklahoma Outline Introduction and Experimental Considerations

More information

Precision Jet Physics At the LHC

Precision Jet Physics At the LHC Precision Jet Physics At the LHC Matthew Schwartz Harvard University JETS AT THE LHC An (almost) universal feature of SUSY is and Source: Atlas TDR SIGNAL VS. BACKGROUND Source: Atlas TDR Can we trust

More information

Measurement of the jet production properties at the LHC with the ATLAS Detector

Measurement of the jet production properties at the LHC with the ATLAS Detector Measurement of the jet production properties at the LHC with the ALAS Detector Stanislav okar Comenius University, Bratislava On behalf of the ALAS collaboration Different features of the jet production

More information

Multi-differential jet cross sections in CMS

Multi-differential jet cross sections in CMS Multi-differential jet cross sections in CMS A. Bermudez Martinez on behalf of the CMS collaboration. Deutsches Elektronen-Synchrotron (DESY) April 07 A. Bermudez (DESY) April 07 / 5 QCD Main background

More information

Azimuthal Correlations for Inclusive 2-jet, 3-jet and 4-jet events in pp collisions at s = 13 TeV with CMS

Azimuthal Correlations for Inclusive 2-jet, 3-jet and 4-jet events in pp collisions at s = 13 TeV with CMS Azimuthal Correlations for Inclusive 2-jet, 3-jet and 4-jet events in pp collisions at s = 13 TeV with CMS Paris Gianneios University of Ioannina 29 th March 2018, HEP Athens Outline 1 2 3 4 5 CMS Detector

More information

Event shapes in hadronic collisions

Event shapes in hadronic collisions Event shapes in hadronic collisions Andrea Banfi ETH Zürich SM@LHC - Durham - April Event shapes at hadron colliders Event shapes are combinations of hadron momenta in a number related to the geometry

More information

Top production measurements using the ATLAS detector at the LHC

Top production measurements using the ATLAS detector at the LHC Top production measurements using the ATLAS detector at the LHC INFN, Sezione di Bologna and University of Bologna E-mail: romano@bo.infn.it This paper is an overview of recent results on top-quark production

More information

Measurement of photon production cross sections also in association with jets with the ATLAS detector

Measurement of photon production cross sections also in association with jets with the ATLAS detector Nuclear and Particle Physics Proceedings 00 (07) 6 Nuclear and Particle Physics Proceedings Measurement of photon production cross sections also in association with jets with the detector Sebastien Prince

More information

QCD dijet analyses at DØ

QCD dijet analyses at DØ QCD dijet analyses at DØ Pavel Demine for the DØ collaboration DAPNIA-SPP, CEA Saclay, France Contents: DØ detector Jet reconstruction at DØ Dijet mass spectrum Dijet azimuthal angle decorrelation XII

More information

Atlas results on diffraction

Atlas results on diffraction Atlas results on diffraction Alessia Bruni INFN Bologna, Italy for the ATLAS collaboration Rencontres du Viet Nam 14th Workshop on Elastic and Diffractive Scattering Qui Nhon, 16/12/2011 EDS 2011 Alessia

More information

PoS(DIS2014)064. Forward-Central Jet Correlations. Pedro Miguel RIBEIRO CIPRIANO, on behalf of CMS. DESY - CMS

PoS(DIS2014)064. Forward-Central Jet Correlations. Pedro Miguel RIBEIRO CIPRIANO, on behalf of CMS. DESY - CMS DESY - CMS E-mail: pedro.cipriano@desy.de The azimuthal correlation between forward and central jets has been measured in proton proton collisions at the LHC, at the centre-of-mass energy of 7 TeV. The

More information

QCD at CDF. Régis Lefèvre IFAE Barcelona On behalf of the CDF Collaboration

QCD at CDF. Régis Lefèvre IFAE Barcelona On behalf of the CDF Collaboration QCD at CDF Régis Lefèvre IFAE Barcelona On behalf of the CDF Collaboration Jet Inclusive Cross-Section Underlying event studies Jet Shapes Specific processes _ W+Jets, γ + γ, γ + b/c, b-jet / bb jet Diffraction

More information

Using Drell-Yan to Probe the

Using Drell-Yan to Probe the Using Drell-Yan to Probe the Underlying Event in Run 2 at CDF Deepak Kar University of Florida (On behalf of the CDF Collaboration) Experimental Particle Physics Seminar 30 th October 2008 Prologue: We

More information

Moriond QCD. Latest Jets Results from the LHC. Klaus Rabbertz, KIT. Proton Structure (PDF) Proton Structure (PDF) Klaus Rabbertz

Moriond QCD. Latest Jets Results from the LHC. Klaus Rabbertz, KIT. Proton Structure (PDF) Proton Structure (PDF) Klaus Rabbertz Latest Jets Results from the LHC Proton Structure (PDF) Proton Structure (PDF), KIT 1 Flash Menu Motivation Accelerators and Detectors Jet Algorithms and Calibration Inclusive Jets Dijets and 3-Jets The

More information

Hadron Collider Physics, HCP2004, June 14-18

Hadron Collider Physics, HCP2004, June 14-18 ) " % "" ' & % % " ) " % '% &* ' ) * ' + " ' ) ( $#! ' "") ( * " ) +% % )( (. ' + -, '+ % &* ' ) ( 021 % # / ( * *' 5 4* 3 %( '' ' " + +% Hadron Collider Physics, HCP2004, June 14-18 The Run II DØ Detector

More information

EW theoretical uncertainties on the W mass measurement

EW theoretical uncertainties on the W mass measurement EW theoretical uncertainties on the W mass measurement Luca Barze 1, Carlo Carloni Calame 2, Homero Martinez 3, Guido Montagna 2, Oreste Nicrosini 3, Fulvio Piccinini 3, Alessandro Vicini 4 1 CERN 2 Universita

More information

July 8, 2015, Pittsburgh. Jets. Zoltan Nagy DESY

July 8, 2015, Pittsburgh. Jets. Zoltan Nagy DESY July 8, 2015, Pittsburgh Jets Zoltan Nagy DESY What are Jets? A di-jet ATLAS event A multi-jet (6-jet) event What are Jets? What are Jets? The pt is concentrated in a few narrow sprays of particles These

More information

QCD Jets at the LHC. Leonard Apanasevich University of Illinois at Chicago. on behalf of the ATLAS and CMS collaborations

QCD Jets at the LHC. Leonard Apanasevich University of Illinois at Chicago. on behalf of the ATLAS and CMS collaborations QCD Jets at the LHC Leonard Apanasevich University of Illinois at Chicago on behalf of the ATLAS and CMS collaborations Outline Physics at the LHC Jet Reconstruction and Performance Clustering Algorithms

More information

from Klaus Rabbertz, KIT Proton Structure (PDF) Proton Structure (PDF) Klaus Rabbertz Status of αs Determinations Mainz, Germany,

from Klaus Rabbertz, KIT Proton Structure (PDF) Proton Structure (PDF) Klaus Rabbertz Status of αs Determinations Mainz, Germany, High precision fundamental constants at the TeV scale from Proton Structure (PDF) Proton Structure (PDF), KIT 1 Outline 2012: No LHC results yet Motivation PDG2012 Jet energy scale αs from jet cross sections

More information

Measurement of multijets and the internal structure of jets at ATLAS

Measurement of multijets and the internal structure of jets at ATLAS Measurement of multijets and the internal structure of jets at ALAS Bilge M. Demirköz, on behalf of the ALAS Collaboration Institut de Fisica d Altes Energies, Barcelona, SPAIN also at Middle East echnical

More information

HERAFitter - an open source QCD Fit platform

HERAFitter - an open source QCD Fit platform DESY (Deutsches Elektronen-Synchrotron) E-mail: hayk.pirumov@desy.de The first stable release of the HERAFitter package is presented. HERAFitter is an open source project which provides a framework for

More information

QCD at the Tevatron: The Production of Jets & Photons plus Jets

QCD at the Tevatron: The Production of Jets & Photons plus Jets QCD at the Tevatron: The Production of Jets & Photons plus Jets Mike Strauss The University of Oklahoma The Oklahoma Center for High Energy Physics for the CDF and DØD Collaborations APS 2009 Denver, Colorado

More information

Parton densities with Parton Branching method and applications

Parton densities with Parton Branching method and applications Parton densities with Parton Branching method and applications Radek Žlebčík1 Armando Bermudez Martinez1, Francesco Hautmann2, Hannes Jung1, Ola Lelek1, Voica Radescu3 1 Deutsches Elektronen-Synchrotron

More information

Jet and photon production and

Jet and photon production and Jet and photon production and extraction of at HERA Radek Žlebčík1 On behalf of H1 and ZEUS collaborations 1 Deutsches Elektronen-Synchrotron (DESY) New Frontiers in Physics Kolymbari, August 24 HERA Collider

More information

Measurement of jet production in association with a Z boson at the LHC & Jet energy correction & calibration at HLT in CMS

Measurement of jet production in association with a Z boson at the LHC & Jet energy correction & calibration at HLT in CMS Measurement of jet production in association with a Z boson at the LHC & Jet energy correction & calibration at HLT in CMS Fengwangdong Zhang Peking University (PKU) & Université Libre de Bruxelles (ULB)

More information

Measurement of the Inclusive Isolated Prompt Photon Cross Section at CDF

Measurement of the Inclusive Isolated Prompt Photon Cross Section at CDF of the Inclusive Isolated Cross at IFAE Barcelona HEP Seminar University of Virginia Outline Theoretical introduction Prompt photon production The The Photon detection prediction The pqcd NLO prediction

More information

Colin Jessop. University of Notre Dame

Colin Jessop. University of Notre Dame Colin Jessop University of Notre Dame Test the evolution of QCD to higher energies ( and lower x) Search for new particles with Quarks, gluons and photons in Final state Jet production is dominant process

More information

PoS(ICHEP2012)300. Electroweak boson production at LHCb

PoS(ICHEP2012)300. Electroweak boson production at LHCb Physik-Institut der Universität Zürich, Switzerland. E-mail: jonathan.anderson@cern.ch The electroweak boson production cross-sections have been measured in the forward region using s = 7 TeV proton-proton

More information

QCD Studies at the Tevatron

QCD Studies at the Tevatron QCD Studies at the Tevatron Results from the CDF and DØ Collaborations Markus Wobisch, Louisiana Tech University DESY Seminar, June 24, 2008 Fermilab Tevatron - Run II CDF Chicago pp at 1.96 TeV DØ 36x36

More information

Physics at Hadron Colliders Part II

Physics at Hadron Colliders Part II Physics at Hadron Colliders Part II Marina Cobal Università di Udine 1 The structure of an event One incoming parton from each of the protons enters the hard process, where then a number of outgoing particles

More information

Fast pqcd Calculations for PDF Fits

Fast pqcd Calculations for PDF Fits Fast pqcd Calculations for PDF Fits Markus Wobisch, Fermilab in collaboration with T. Kluge, DESY and K. Rabbertz, Univ. Karlsruhe XIV Workshop on Deep Inelastic Scattering, DIS 2006 April 20-24, 2006,

More information

Recent DØ results in Diffractive and Jet Physics

Recent DØ results in Diffractive and Jet Physics Recent DØ results in Diffractive and Jet Physics * Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 E-mail: odell@fnal.gov DØ measurements of the inclusive jet cross section and the

More information

Power corrections to jet distributions at hadron colliders

Power corrections to jet distributions at hadron colliders Power corrections to jet distributions at hadron colliders Lorenzo Magnea Università di Torino INFN, Sezione di Torino Work in collaboration with: M. Cacciari, M. Dasgupta, G. Salam. DIS 7 Munich 8//7

More information

Proton anti proton collisions at 1.96 TeV currently highest centre of mass energy

Proton anti proton collisions at 1.96 TeV currently highest centre of mass energy Tevatron & Experiments 2 Proton anti proton collisions at 1.96 TeV currently highest centre of mass energy Tevatron performing very well 6.5 fb 1 delivered (per experiment) 2 fb 1 recorded in 2008 alone

More information

Measurement of multi-jet cross sections in proton proton collisions at a 7 TeV center-of-mass energy

Measurement of multi-jet cross sections in proton proton collisions at a 7 TeV center-of-mass energy Eur. Phys. J. C (2011) 71:1763 DOI 10.1140/epjc/s10052-011-1763-6 Regular Article - Experimental Physics Measurement of multi-jet cross sections in proton proton collisions at a 7 TeV center-of-mass energy

More information

On QCD jet mass distributions at LHC

On QCD jet mass distributions at LHC On QCD jet mass distributions at LHC Kamel Khelifa-Kerfa (USTHB) with M. Dasgupta, S. Marzani & M. Spannowsky CIPSA 2013 30 th Sep - 2 nd Oct 2013 Constantine, Algeria Outline 1 Jet substructure 2 Jet

More information

arxiv: v1 [hep-ex] 24 Oct 2017

arxiv: v1 [hep-ex] 24 Oct 2017 Production of electroweak bosons in association with jets with the ATLAS detector arxiv:1710.08857v1 [hep-ex] 24 Oct 2017 S. Spagnolo on behalf of the ATLAS Collaboration INFN Lecce and Dip. di Matematica

More information

Jet Results in pp and Pb-Pb Collisions at ALICE

Jet Results in pp and Pb-Pb Collisions at ALICE Jet Results in pp and Pb-Pb Collisions at ALICE Oliver Busch for the ALICE Collaboration Motivation Jet reconstruction in ALICE Jets in pp Jets in Pb-Pb Hadron triggered recoil jets Motivation Jets originate

More information

QCD Studies at LHC with the Atlas detector

QCD Studies at LHC with the Atlas detector QCD Studies at LHC with the Atlas detector Introduction Sebastian Eckweiler - University of Mainz (on behalf of the ATLAS Collaboration) Examples of QCD studies Minimum bias & underlying event Jet-physics

More information

arxiv: v1 [hep-ex] 15 Jan 2019

arxiv: v1 [hep-ex] 15 Jan 2019 CMS-CR-8/37 January 7, 9 Top Quark Modelling and Tuning at CMS arxiv:9.559v [hep-ex] 5 Jan 9 Emyr Clement on behalf of the CMS Collaboration University of Bristol Recent measurements dedicated to improving

More information

Bound-State Effects on Kinematical Distributions of Top-Quarks at Hadron Colliders

Bound-State Effects on Kinematical Distributions of Top-Quarks at Hadron Colliders 1 Bound-State Effects on Kinematical Distributions of Top-Quarks at Hadron Colliders Hiroshi YOKOYA (CERN-Japan Fellow) based on arxiv:1007.0075 in collaboration with Y. Sumino (Tohoku univ.) 2 Outline

More information

Zhong-Bo Kang Los Alamos National Laboratory

Zhong-Bo Kang Los Alamos National Laboratory Introduction to pqcd and Jets: lecture 3 Zhong-Bo Kang Los Alamos National Laboratory Jet Collaboration Summer School University of California, Davis July 19 21, 2014 Selected references on QCD QCD and

More information

PoS(EPS-HEP2015)309. Electroweak Physics at LHCb

PoS(EPS-HEP2015)309. Electroweak Physics at LHCb European Organisation for Nuclear Research (CERN), Switzerland E-mail: william.barter@cern.ch LHCb s unique forward acceptance allows for complementary measurements of electroweak boson production to those

More information

Results on QCD and Heavy Flavors Production at the Tevatron

Results on QCD and Heavy Flavors Production at the Tevatron Results on QCD and Heavy Flavors Production at the Tevatron Donatella Lucchesi INFN and University of Padova October 21 Padova Outline: Machine and detector description Latest results on QCD Heavy Flavor:

More information

W/Z + jets and W/Z + heavy flavor production at the LHC

W/Z + jets and W/Z + heavy flavor production at the LHC W/Z + jets and W/Z + heavy flavor production at the LHC A. Paramonov (ANL) on behalf of the ATLAS and CMS collaborations Moriond QCD 2012 Motivation for studies of jets produced with a W or Z boson Standard

More information

Minimum Bias and Underlying Event Studies at CDF

Minimum Bias and Underlying Event Studies at CDF FERMILAB-CONF--531-E Minimum Bias and Underlying Event Studies at CDF INFN, Bologna E-mail: moggi@bo.infn.it Soft, non-perturbative, interactions are poorly understood from the theoretical point of view

More information

arxiv: v1 [hep-ex] 21 Aug 2011

arxiv: v1 [hep-ex] 21 Aug 2011 arxiv:18.155v1 [hep-ex] 1 Aug 011 Early Searches with Jets with the ATLAS Detector at the LHC University of Chicago, Enrico Fermi Institute E-mail: georgios.choudalakis@cern.ch We summarize the analysis

More information

What to do with Multijet Events?

What to do with Multijet Events? DØ note 4465 2004-06-03 What to do with Multijet Events? T. Hebbeker RWTH Aachen ABSTRACT Multijet events are frequently produced in p p collisions. Events with several jets might indicate physics beyond

More information

LHC Heavy Ion Physics Lecture 5: Jets, W, Z, photons

LHC Heavy Ion Physics Lecture 5: Jets, W, Z, photons LHC Heavy Ion Physics Lecture 5: Jets, W, Z, photons HUGS 2015 Bolek Wyslouch Techniques to study the plasma Radiation of hadrons Azimuthal asymmetry and radial expansion Energy loss by quarks, gluons

More information

Overview of PDF-sensitive measurements from Run I in ATLAS

Overview of PDF-sensitive measurements from Run I in ATLAS Overview of PDF-sensitive measurements from Run I in ATLAS on behalf of ATLAS Parton Distributions for the LHC 05 February 5- ATLAS SM Measurements Traditional processes for PDF fits include jets, Drell-Yan

More information

Testing QCD at the LHC and the Implications of HERA DIS 2004

Testing QCD at the LHC and the Implications of HERA DIS 2004 Testing QCD at the LHC and the Implications of HERA DIS 2004 Jon Butterworth Impact of the LHC on QCD Impact of QCD (and HERA data) at the LHC Impact of the LHC on QCD The LHC will have something to say

More information

Azimuthal decorrelations between jets in QCD

Azimuthal decorrelations between jets in QCD Azimuthal decorrelations between jets in QCD Andrea Banfi ETH Zurich q q p 1 p 1 Outline Azimuthal decorrelations in QCD hard processes Dijets in the back-to-back region Phenomenology of azimuthal decorrelations

More information

! s. and QCD tests at hadron colliders. world summary of! s newest results (selection)! s from hadron colliders remarks

! s. and QCD tests at hadron colliders. world summary of! s newest results (selection)! s from hadron colliders remarks ! s and QCD tests at hadron colliders world summary of! s newest results (selection)! s from hadron colliders remarks S. Bethke MPI für Physik, Munich S. Bethke: a s and QCD tests at hadron colliders Collider

More information

QCD and Top physics studies in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector

QCD and Top physics studies in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector Journal of Physics: Conference Series QCD and Top physics studies in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector To cite this article: Marcello Barisonzi 2012 J. Phys.:

More information

Physics at Hadron Colliders

Physics at Hadron Colliders Physics at Hadron Colliders Part 2 Standard Model Physics Test of Quantum Chromodynamics - Jet production - W/Z production - Production of Top quarks Precision measurements -W mass - Top-quark mass QCD

More information

QCD in gauge-boson production at the LHC "

QCD in gauge-boson production at the LHC QCD in gauge-boson production at the LHC " " Matthias Schott " on behalf of the ATLAS and CMS Collaborations" Prof. Dr. Matthias Schott What can we learn " from those tests?" Inclusive and differential

More information

Distinguishing quark and gluon jets at the LHC

Distinguishing quark and gluon jets at the LHC Distinguishing quark and jets at the LHC Giorgia Rauco (on behalf of the ALAS and CMS Collaborations) Universität Zürich, Zürich, Switzerland Abstract: Studies focused on discriminating between jets originating

More information

Event Generator Physics 2

Event Generator Physics 2 Event Generator Physics University of Cambridge 1st MCnet School, IPPP Durham 18 th 20 th April 2007 Structure of LHC Events 1. Hard process 2. Parton shower 3. Hadronization 4. Underlying event Lecture

More information

Zhong-Bo Kang Los Alamos National Laboratory

Zhong-Bo Kang Los Alamos National Laboratory Introduction to pqcd and Jets: lecture 1 Zhong-Bo Kang Los Alamos National Laboratory Jet Collaboration Summer School University of California, Davis July 19 1, 014 Selected references on QCD! QCD and

More information

Mini-Bias and Underlying Event Studies at CMS

Mini-Bias and Underlying Event Studies at CMS Yuan Chao Department of Physics National Taiwan University 1617 Taipei, TAIWAN 1 Introduction The Tevatron experiments provide us very good information for the quantum chromodynamics (QCD) modelings of

More information

Forward Jets with the CAL

Forward Jets with the CAL Forward Jets with the CAL Sabine Lammers Juan Terron March 4, 004 ZEUS Collaboration Meeting Motivation Event Selection Monte Carlo Programs Forward Jet Measurements Summary and Plans Parton Evolution

More information

Future Perspectives in HEP Jet Physics and Precision Tests of QCD

Future Perspectives in HEP Jet Physics and Precision Tests of QCD Future Perspectives in HEP Jet Physics and Precision Tests of QCD Proton Structure (PDF) Proton Structure (PDF), KIT 1 Outline Motivation Photons Boson + Jets Inclusive Jets Dijets Multi-Jets and the strong

More information

FERMI NATIONAL ACCELERATOR LABORATORY

FERMI NATIONAL ACCELERATOR LABORATORY FERMI NATIONAL ACCELERATOR LABORATORY arxiv:0908.1374v1 [hep-ex] 10 Aug 2009 TEVEWWG/WZ 2009/01 FERMILAB-TM-2439-E CDF Note 9859 D0 Note 5965 10 th August 2009 Updated Combination of CDF and D0 Results

More information

Z 0 /γ +Jet via electron decay mode at s = 7TeV in

Z 0 /γ +Jet via electron decay mode at s = 7TeV in PRAMANA c Indian Academy of Sciences Vol. 86, No. 2 journal of February 2016 physics pp. 487 491 Z 0 /γ +Jet via electron decay mode at s = 7TeV in CMS@LHC U BHAWANDEEP and SUMAN B BERI for CMS Collaboration

More information

Physics at LHC. lecture one. Sven-Olaf Moch. DESY, Zeuthen. in collaboration with Martin zur Nedden

Physics at LHC. lecture one. Sven-Olaf Moch. DESY, Zeuthen. in collaboration with Martin zur Nedden Physics at LHC lecture one Sven-Olaf Moch Sven-Olaf.Moch@desy.de DESY, Zeuthen in collaboration with Martin zur Nedden Humboldt-Universität, October 22, 2007, Berlin Sven-Olaf Moch Physics at LHC p.1 LHC

More information

Hard QCD and Hadronic Final State at HERA. Alice Valkárová, on behalf of H1 and ZEUS Collaborations

Hard QCD and Hadronic Final State at HERA. Alice Valkárová, on behalf of H1 and ZEUS Collaborations Hard QCD and Hadronic Final State at HERA Alice Valkárová, on behalf of H1 and ZEUS Collaborations Diffraction 2016, Acireale, Sicily 4.9.2016 HERA collider experiments 27.5 GeV electrons/positrons on

More information

Standard Model of Particle Physics SS 2012

Standard Model of Particle Physics SS 2012 Lecture: Standard Model of Particle Physics Heidelberg SS 2012 W- and Z-Bosons 1 2 Contents Discovery of real W- and Z-bosons Intermezzo: QCD at Hadron Colliders LEP + Detectors W- and Z- Physics at LEP

More information

Top, electroweak and recent results from CDF and combinations from the Tevatron

Top, electroweak and recent results from CDF and combinations from the Tevatron IL NUOVO CIMENTO 40 C (2017) 181 DOI 10.1393/ncc/i20177181-7 Colloquia: LaThuile 2017 Top, electroweak and recent results from CDF and combinations from the Tevatron D. Lucchesi( 1 )( 2 ) on behalf of

More information

from D0 collaboration, hep-ex/

from D0 collaboration, hep-ex/ At present at the Tevatron is extracted from the transverse-mass distribution Events / GeV/c 2 2000 1500 1000 500 Fit region 0 50 60 70 80 90 100 110 120 from D0 collaboration, hep-ex/0007044 Transverse

More information

PoS(ICHEP2012)194. Measurements of the t t forward-backward asymmetry at CDF. Christopher Hays

PoS(ICHEP2012)194. Measurements of the t t forward-backward asymmetry at CDF. Christopher Hays Measurements of the t t forward-backward asymmetry at CDF On behalf of the CDF Collaboration Oxford University E-mail: hays@physics.ox.ac.uk At next-to-leading order in QCD, the t t forward-backward asymmetry

More information

Toward an Understanding of Hadron-Hadron. Collisions From Feynman-Field to the LHC

Toward an Understanding of Hadron-Hadron. Collisions From Feynman-Field to the LHC Toward an Understanding of Hadron-Hadron Collisions From Feynman-Field to the LHC Rick Field University of Florida Outline of Talk The old days of Feynman-Field Phenomenology. XXIèmes Rencontres de Blois

More information

OPAL =0.08) (%) (y cut R 3. N events T ρ. L3 Data PYTHIA ARIADNE HERWIG. L3 Data PYTHIA ARIADNE HERWIG

OPAL =0.08) (%) (y cut R 3. N events T ρ. L3 Data PYTHIA ARIADNE HERWIG. L3 Data PYTHIA ARIADNE HERWIG CR-244 15 May 1996 QCD-RESULTS AND STUDIES OF FOUR FERMION PROCESSES AT THE INTERMEDIATE LEP ENERGY SCALE p s = 130{136 GEV Hans-Christian Schultz-Coulon Universitat Freiburg, Fakultat fur Physik Hermann-Herder-Strae

More information

2. HEAVY QUARK PRODUCTION

2. HEAVY QUARK PRODUCTION 2. HEAVY QUARK PRODUCTION In this chapter a brief overview of the theoretical and experimental knowledge of heavy quark production is given. In particular the production of open beauty and J/ψ in hadronic

More information

Search for Quark Substructure in 7 TeV pp Collisions with the ATLAS Detector

Search for Quark Substructure in 7 TeV pp Collisions with the ATLAS Detector Search for Quark Substructure in 7 TeV pp Collisions with the ATLAS Detector Frank Berghaus SUPERVISOR: Michel Lefebvre University of Victoria June 12, 2012 Introduction ATLAS and the LHC The LHC provides

More information

Powheg in Herwig++ for SUSY

Powheg in Herwig++ for SUSY Powheg in Herwig++ for SUSY Alix Wilcock IPPP, Durham University 27/04/205 Based on work done with P. Richardson, S. Plätzer and B. Fuks Acronyms SUSY = Supersymmetry Want SUSY to solve the hierarchy problem

More information

Theoretical Predictions For Top Quark Pair Production At NLO QCD

Theoretical Predictions For Top Quark Pair Production At NLO QCD Theoretical Predictions For Top Quark Pair Production At NLO QCD Malgorzata Worek Wuppertal Uni. HP2: High Precision for Hard Processes, 4-7 September 2012, MPI, Munich 1 Motivations Successful running

More information

Measurements of charm and beauty proton structure functions F2 c c and F2 b b at HERA

Measurements of charm and beauty proton structure functions F2 c c and F2 b b at HERA Measurements of charm and beauty proton structure functions F c c and F b b at HERA Vladimir Chekelian MPI for Physics, Germany E-mail: shekeln@mail.desy.de Inclusive charm and beauty production is studied

More information

Jet Physics with ALICE

Jet Physics with ALICE Jet Physics with ALICE Oliver Busch for the ALICE collaboration Oliver Busch Tsukuba 2014 /03/13 1 Outline introduction results from pp jets in heavy-ion collisions results from Pb-Pb collisions jets in

More information

QCD Measurements at DØ

QCD Measurements at DØ QCD Measurements at DØ University of Texas -Arlington- Seminar, University of Virginia January 24th 27 TeVatron Collider at Fermilab Proton-Antiproton Collisions at Center-of-Mass s = 1.96 TeV Two Multi-Purpose

More information

PDFs for Event Generators: Why? Stephen Mrenna CD/CMS Fermilab

PDFs for Event Generators: Why? Stephen Mrenna CD/CMS Fermilab PDFs for Event Generators: Why? Stephen Mrenna CD/CMS Fermilab 1 Understanding Cross Sections @ LHC: many pieces to the puzzle LO, NLO and NNLO calculations K-factors Benchmark cross sections and pdf correlations

More information

Nikos Varelas. University of Illinois at Chicago. CTEQ Collaboration Meeting Northwestern November 20, Nikos Varelas. CTEQ Meeting Nov 20, 2009

Nikos Varelas. University of Illinois at Chicago. CTEQ Collaboration Meeting Northwestern November 20, Nikos Varelas. CTEQ Meeting Nov 20, 2009 QCD Physics at CMS University of Illinois at Chicago CTEQ Collaboration Meeting Northwestern November 0, 009 1 QCD Physics at CMS University of Illinois at Chicago CTEQ Collaboration Meeting Northwestern

More information

Future prospects of di-jet production at. forward rapidity constraining Δg(x) at low x in. polarized p+p collisions at RHIC

Future prospects of di-jet production at. forward rapidity constraining Δg(x) at low x in. polarized p+p collisions at RHIC Future prospects of di-jet production at forward rapidity constraining Δg(x at low x in polarized p+p collisions at RHIC Bernd Surrow QCD Evolution Workshop - QCD! Santa Fe, NM, May, Bernd Surrow Outline

More information

Bound-state effects in ttbar production at the LHC

Bound-state effects in ttbar production at the LHC 1 Bound-state effects in ttbar production at the LHC Hiroshi YOKOYA (National Taiwan University) based on works in collaboration with K.Hagiwara(KEK) and Y.Sumino(Tohoku U) GGI workshop, Firenze, 2011.09.28

More information

PoS(Confinement X)171

PoS(Confinement X)171 in pp collisions at LHC energies Institute for Particle and Nuclear Physics, Wigner RCP, HAS 2 Budapest, XII. Konkoly Thege Miklos ut 29-33 E-mail: sona.pochybova@cern.ch With increasing luminosities at

More information

QCD Phenomenology at High Energy

QCD Phenomenology at High Energy QCD Phenomenology at High Energy CERN Academic Training Lectures 18-21 February 2008 Lecture 5: Matching Fixed Order Matrix Elements with Parton Showers ME-PS Matching Two rather different objectives:

More information

Recent Results from the Tevatron

Recent Results from the Tevatron Recent Results from the Tevatron Simona Rolli Tufts University (on behalf of the CDF and D0 Collaborations) PPC 2010: IV INTERNATIONAL WORKSHOP ON THE INTERCONNECTION BETWEEN PARTICLE PHYSICS AND COSMOLOGY

More information

Lecture 5. QCD at the LHC Joey Huston Michigan State University

Lecture 5. QCD at the LHC Joey Huston Michigan State University Lecture 5 QCD at the LHC Joey Huston Michigan State University Tevatron data Wealth of data from the Tevatron, both Run 1 and Run 2, that allows us to test/add to our pqcd formalism with analysis procedures/

More information

High p T physics at the LHC Lecture III Standard Model Physics

High p T physics at the LHC Lecture III Standard Model Physics High p T physics at the LHC Lecture III Standard Model Physics Miriam Watson, Juraj Bracinik (University of Birmingham) Warwick Week, April 2011 1. LHC machine 2. High PT experiments Atlas and CMS 3. Standard

More information

W, Z and top production measurements at LHCb

W, Z and top production measurements at LHCb 1 W, Z and top production measurements at LHCb Lorenzo Sestini, on behalf of the LHCb collaboration. Universitá di Padova e INFN E-mail: lorenzo.sestini@cern.ch The LHCb experiment offers a complementary

More information

Experimental review of jet physics in hadronic collisions

Experimental review of jet physics in hadronic collisions Eur. Phys. J. C (2009) 61: 637 647 DOI 10.1140/epjc/s10052-008-0849-2 Regular Article - Experimental Physics Experimental review of jet physics in hadronic collisions Mario Martínez a ICREA/IFAE, Institut

More information