Large R jets and boosted. object tagging in ATLAS. Freiburg, 15/06/2016. #BoostAndNeverLookBack. Physikalisches Institut Universität Heidelberg
|
|
- Harriet Owens
- 5 years ago
- Views:
Transcription
1 Large R jets and boosted object tagging in ATLAS Christoph Anders Physikalisches Institut Universität Heidelberg #BoostAndNeverLookBack Freiburg, 15/06/2016
2 ??? Cambridge-Aachen 2 arxiv: Higgs tagger trimming n-subjetiness Jet substructure large R jets R2D2 BOOST anti kt HEPTopTagger subjets fully hadronic, di-jet mass grooming End of last year! there was a bump
3 Have: Standard Model Want: New physics! Extended gauge sector: Z > tt - W > WZ Extra dimensions: GRS >tt/ww/zz - Susy: stop decays In this context new heavy resonances decaying to pairs of SM bosons (W/Z/H) or top quarks would be nice (we need one to better calibrate our jets!) Hadronic final states? BR(W > hadrons) ~ 2/3 -
4 Detecting particles in ATLAS center of mass energy LHC Run 1: 7 & 8TeV LHC Run 2: 13TeV How about jets? 4
5 Jets Jets: collimated bunches of stable particles originating from partons after hadronization Jet finding: an approximate attempt to reverse engineer this QM process " More than one way to do this! 5 Sequential jet clustering algorithms
6 Sequential jet clustering algorithms Use clusters of calorimeter energy as input particles (also tracks or truth particles can be used) Distance: dij=min(pti 2p,pTj 2p ) ΔRij 2 /R 2 algo: find pair with smallest dij if dij > dib = pti 2p > i is already a jet, remove it else > merge i,j repeat until all particles are clustered into a jet parameters: R: geometrical separation, radius parameter, not a radius! p: energy vs geometry, 2=kt ; 0=C/A ; -2=anti-kt 6
7 kt Cambridge-Aachen Take home message: kt = soft first C/A = closest first anti kt = hard first anti kt Towards Jetography, G. Salam, Eur.Phys.J. C67 (2010)
8 What about BOOST? 8
9 What about BOOST? July 2016 Early bird registration until tomorrow!!! 8
10 9 subjets
11 9 subjets large R jet
12 Angular separation Rule of thumb: standard jet in ATLAS: R= 0.4 JHEP09 (2013) 076 pt>200gev to contain W in R=1.0 jets top in R=1.5 jets 10
13 Two problems Larger jets pick up more junk! How to reject jets from light quarks and gluons? 11
14 recluster into small subjets JHEP 02 (2010) 084 Trimming JHEP09 (2013) 076 ATLAS typical values (for R=1.0 jets): Run 1: Rsub=0.3, fcut = 0.05 Run 2: Rsub=0.2, fcut = remove low pt subjets We ll see this at work in a bit! One easy example:
15 - Side note: lep+jets tt hadronic side leptonic side 13 Graph by D0 experiment
16 - Side note: lep+jets tt study large R jets in data for top decays W decays require BOOST: pt>200gev identify events with 14 Graph by D0 experiment
17 Jet mass Top vs QCD Trimming signal and background JHEP09 (2013) Normalized entries 2 where i = all clusters 0.25 ATLAS Simulation Preliminary anti-k t LCW jets with R=1.0 No jet grooming, no pileup correction s = 14 TeV, 25 ns bunch spacing jet < 1000 GeV jet η <1.2, 500 < p T Pythia8 Z tt (m =2 TeV) Z µ=0 µ=80 µ=140 µ=200 µ= Un-trimmed ATLAS-CONF Leading jet mass [GeV]
18 Jet mass Top vs QCD Trimming signal and background JHEP09 (2013) Normalized Normalized entries entries 2 where i = all clusters 0.25 ATLAS Simulation Preliminary LCW jets with R= ATLAS Simulation Preliminary anti-k t t LCW jets with R=1.0 No Trimmed, jet grooming, pileup no corrected pileup correction s s = = TeV, ns ns bunch spacing jet jet η jet <1.2, < < p p < < 1000 GeV T T Pythia8 Z Z tt tt (m (m jet η =2 =2 TeV) Z Z µ=0 µ=0 µ=80 µ=140 µ=200 µ=300 Un-trimmed Trimmed ATLAS-CONF Leading jet jet mass [GeV]
19 JHEP09 (2013) 076 Trimming signal 0 0 and background 15 ATLAS-CONF Leading jet jet mass [GeV] arxiv: Un-trimmed Trimmed Normalized Normalized entries entries 0.15 jet η anti-k t t LCW jets with R=1.0 No Trimmed, jet grooming, pileup no corrected pileup correction s s = = TeV, ns ns bunch spacing jet jet η jet <1.2, < < p p < < 1000 GeV T T Pythia8 Z Z tt tt (m (m =2 =2 TeV) Z Z!=300!=200!=140!= ATLAS Simulation Preliminary LCW jets with R=1.0!=0!= ATLAS Simulation Preliminary Top vs QCD Works in data too! where i = all clusters 2 Jet mass
20 kt splitting scales go back one step in the kt clustering Z >qq vs QCD Example: Z >qq: symmetric two-body decay: both subjets apart and of similar pt > large d12 For top decay: go back one more step: d23 JHEP09 (2013)
21 N=2 n-subjetiness Observables related to Nsubjet reclusters jet constituents with kt into N subjets subjets define axes within the jet constituent k distance of k to subjet i 17 Signal JHEP 03 (2011) 015 ratio: background arxiv: subjet like 2 subjet like
22 JHEP 12 (2014) 009! Energy correlation functions m of particle in 2-body decay for beta=1 18 Signal no subjets! background arxiv:
23 Variables arxiv: Are the same, apart from the mass cut! W vs Z Compare fixed signal efficiency Jet collections bkg eff = 50% Pick the following: Jet type and radius parameter, e.g. anti kt R=1.0 Groomer and its parameters, e.g. trimming, Rsub=0.3, fcut=5% Choose substructure variables (of course there are many more!) Building a simple W tagger
24 Run 1 boson tagging in data Large R jet mass arxiv: Select D2, before mass cut
25 Efficiency Signal Di-jets (background) 21 arxiv:
26 q q Large R jet W/Z Heavy Resonance W/Z q q Large R jet
27 Back to the start! arxiv: ish Full disclosure: C/A R = 1.2 jets, modified mass-drop filtering (actually no mass drop), Rsub = 0.3 ntracks < 30 Also WW,ZZ. 23
28 Limits on high mass resonance and other final states jet jet No bump in leptonic channels! lep, neutrino + jet arxiv: lep + jet Run 2 will have to tell! Eur. Phys. J. C (2015) 75:209 Eur. Phys. J. C (2015) 75:69 24
29 q q Large R jet On to Run 2 Di-boson searches: W/Z Heavy Resonance W/Z 25 lepton pair or 2. large R jet
30 Multi jet background == fake bosons Looking good! Basics in Run 2 data
31 Simple Run 2 tagger W/Z boson tagger based on: anti kt, R=1.0, Rsub=0.2, fcut=5% Mass and D2 Constant signal efficiency (25% and 50%) ATL-PHYS-PUB
32 Run 2 di-boson (W/Z) searches Channel VV > JJ VV > J ll VV > Jlν VV > Jνν Trigger Large R jet Boson Tag Large R jet, 360GeV 2 with pt>400/200 GeV 50% W/Z + Ntrack<30 Leptons/MET no Backgrounds mutlijet, shape fit in data electron/muon triggers 1 with pt>200 GeV electron/muon triggers 1 with pt>200 GeV MET trigger, 80GeV 1 with pt>200 GeV 50% W/Z 50% W/Z 50% W/Z e + e - / μ + μ - compatible with Z decay Z+jets, from mj sideband MET>100GeV 1 e or mu W+jet mj sideband top b-tagged CR MET>200 GeV Zmumu and btagged ATLAS-CONF
33 Run 2 di-boson (W/Z) searches Channel VV > JJ VV > J ll VV > Jlν VV > Jνν Trigger Large R jet Boson Tag Large R jet, 360GeV 2 with pt>400/200 GeV 50% W/Z + Ntrack<30 Leptons/MET no Backgrounds mutlijet, shape fit in data electron/muon triggers 1 with pt>200 GeV electron/muon triggers 1 with pt>200 GeV MET trigger, 80GeV 1 with pt>200 GeV 50% W/Z 50% W/Z 50% W/Z e + e - / μ + μ - compatible with Z decay Z+jets, from mj sideband MET>100GeV 1 e or mu W+jet mj sideband top b-tagged CR MET>200 GeV Zmumu and btagged ATLAS-CONF
34 Fully hadronic search == Tagging in action 2 large R jets, W or Z tagged, =50%, rej>90% Ntrack<30, exploiting bigger track multiplicity in background, ~30% improvement in sensitivity efficiency checked in data ATLAS-CONF Leading jet, D2 cut 9<Ntrack < 20 Simulation to match data Fit fraction of W/Z in data In data lower by 5%+- 6% > 6% systematic uncertainty 29
35 Evolution in data Full W/Z w/o mass w/o D2 w/o Ntrack No boson tagging WZ 30 ATLAS-CONF ZZ WW
36 ATLAS-CONF Signal eff. & background fit Reco d signal mass Fit! to MC Stable vs mass Low/high mj control region: Fit! to data CR
37 Putting it all together ATLAS-CONF = WZ ZZ WW 32
38 Putting it all together ATLAS-CONF = WZ ZZ WW 32
39 ATLAS-CONF Limits Run 1 excess not excluded Need more data 33
40 The other channels J ll J l# J ## Same conclusion > Need more data! ATLAS-CONF ATLAS-CONF ATLAS-CONF
41 Boosted Higgs bosons b RSG >hh >4b b large R jets h b jets inside large R jets X match small (R=0.2) b-tagged track jets to large R jets h b b 35 larger jets ATL-PHYS- Boost smaller jets
42 Higgs boson tagging b-tagging + Jet substructure jet mass ATL-PHYS-PUB = D2 anti kt R=1.0 Rsub=0.2 fcut=5% Most discrimination from b-tagging, but JSS can help. 36 New in Run 2
43 Back to the original fat jets subjets large R
44 Top tagging Simple taggers possible as for boson tagging Top decays have a few more handles There are more advanced taggers on the market Large R jet Simple tagger example: Select
45 Adv. Tagger Example: JHEP 1010 (2010) 078 HEPTopTagger Identify top to hadron decays with pt top >200GeV Use Cambridge/Aachen R=1.5 jets and their substructure Filter against pile-up b Identify top quarks via mass ratios C/A R=1.5 top candidate top g g q q Pictures G. Kasieczka 39
46 mw/mtop HEPTopTagger in lep+ jet data = m(subjet 2 and 3) m(subjet 1, 2 and 3) top candidate mass 40
47 Efficiency measurement ~40% ~80% Simple Tagger HEPTopTagger ~25-30% ~2-3% 41
48 Fully hadronic tt - resonance search Lots of non top background (QCD) JHEP 1301 (2013)
49 Fully hadronic tt resonance - search (Run 1) It works! JHEP 1301 (2013)
50 ATL-PHYS-PUB Run 2 top tagging ~ constant efficiency Pick two variables 44
51 - tt resonance search in lepton+jet events (Run2) Lepton Large R jet, top tagged Di-top mass ATLAS-CONF main background contains top quarks high efficiency wanted! (comes with low rejection)
52 - tt resonance search in lepton+jet events (Run2) Lepton Large R jet, top tagged Di-top mass ATLAS-CONF main background contains top quarks high! low efficiency wanted (comes with rejection)
53 Jet Reclustering or doing it all backwards Large R jets are great, but they require extra work (calibrations, uncertainties etc) Reclustering: Use standard small R(=0.4) jets as inputs to the large R jet finding! by B. Nachman Advantages: inherit calibrations and uncertainties from well understood small R jets, easy to correlate with MET, faster, Disadvantages: less information used, need to understand close-by-jet effects, it wasn t my idea 46
54 A use case Has been pioneered in ATLAS SUSY analyses How about VLQ: } Many heavy objects to tag! Standard top, W or H taggers not ideal Require a lepton and MET and a few b-tags Reclustered large R jet(s) with mj>100 GeV (i.e. keep H and top) ATLAS-CONF
55 A use case Has been pioneered in ATLAS SUSY analyses } How about VLQ: Many heavy objects to tag! Standard top, W or H taggers not ideal Require a lepton and MET and a few b-tags Reclustered large R jet(s) with mj>100 GeV (i.e. keep H and top) ATLAS-CONF
56 A use case Has been pioneered in ATLAS SUSY analyses How about VLQ: } Many heavy }objects to tag! 1 of many Standard SRs top, W or H taggers not ideal Require a lepton and MET and a few b-tags Reclustered large R jet(s) with mj>100 GeV (i.e. keep H and top) ATLAS-CONF
57 A use case Has been pioneered in ATLAS SUSY analyses How about VLQ: } Many heavy }objects to tag! 1 of many Standard SRs top, W or H taggers not ideal Require a lepton and MET and a few b-tags Reclustered large R jet(s) with mj>100 m}w GeV (i.e. keep H and top) ATLAS-CONF
58 Of course there is more! There will be/ is more W > tb SM W/Z xs Eur. Phys. J. C (2015) 75:165 arxiv: stop search arxiv: SM boosted ttbar xs 48 at 13TeV in Run 2!
59 Of course there is more! Eur. Phys. J. C (2015) 75:165 JHEP 09 (2014 ) 015 W > tb stop search 49 SM W/Z xs arxiv: arxiv: SM boosted ttbar xs W/Z discrimination area subtraction template overlap method There will be more at 13TeV in Run 2! quark gluon tagging q jets mass calibration shower deconstruction in situ JES from top mass subjet calibration variable R jets uncertainty estimation
60 Summary Dramatic increase in understanding of hadronic final states in the last few years Boosted/jet substructure techniques have been shown to work in Run 1 of LHC + been employed in analysis They are even more important at the higher center of mass energy we are running at now First Run 2 results are in > Tagging still works well! We are already thinking about the even more boosted regime G. Salam (not touched on today) 50
61 Closing remark
Jet substructure, top tagging & b-tagging at high pt Pierre-Antoine Delsart and Jeremy Andrea
Jet substructure, top tagging & b-tagging at high pt Pierre-Antoine Delsart and Jeremy Andrea Laboratoire de Physique Subatomique et Corpusculaire CNRS/IN2P3 1 Motivations Now exploring very high pt regions
More informationbb and TopTagging in ATLAS
X bb and TopTagging in ATLAS Mike Nelson, University of Oxford michael.nelson@physics.ox.ac.uk Focus of the discussion I want to try and achieve two things: Introduce the basic tools employed in ATLAS
More informationBoosted hadronic object identification using jet substructure in ATLAS Run-2
Boosted hadronic object identification using jet substructure in ATLAS Run-2 Emma Winkels on behalf of the ATLAS collaboration HEPMAD18 Outline Jets and jet substructure Top and W tagging H bb tagging
More informationSearch for Heavy Resonances X WV lνqq. Zijun Xu Peking University 2016 Dec
Search for Heavy Resonances X WV lνqq Zijun Xu Peking University 2016 Dec Diboson Resonance searches Spin-0, Heavy Higgs, Radion Spin-1, Heavy Vector Triplet W, Z Spin-2, RS/Bulk Graviton 2 Diboson Resonance
More informationSearch for W' tb in the hadronic final state at ATLAS
Search for W' tb in the hadronic final state at ATLAS Ho Ling Li The University of Chicago January 5, 2015 1 Introduction What is W'? A charged, heavy, Standard-Model-like W gauge boson Analysis channels
More informationJet tagging with ATLAS for discoveries in Run II
Jet tagging with ATLAS for discoveries in Run II Ayana Arce (Duke University) November 5 th 2014 The Large Hadron Collider 2008-2013: E CM : 7.0 8.0 TeV m H = 125.4 +/- 0.4 (ATLAS) m H = 125.0 +/- 0.3
More informationBoosted Top Resonance Searches at CMS
Boosted Top Resonance Searches at CMS Justin Pilot, UC Davis on behalf of the CMS Collaboration Northwest Terascale Workshop, Using Jet Substructure University of Oregon 5 April 013 Introduction Many new
More informationSearch for a SM-like Higgs boson. Zijun Xu Peking University ISHP, Beijing Aug 15, 2013
l n W H W Search for a SM-like Higgs boson decaying into WW lνq q in CMS Zijun Xu Peking University ISHP, Beijing Aug 15, 2013 Outline Introduction H WW Lep + MET + 2 jets [1] : 160-600 GeV H WW Lep +
More informationATLAS-CONF October 15, 2010
ATLAS-CONF-2010-096 October 15, 2010 Data-driven background estimation for the H τ + τ τ h search at 7 TeV with the ATLAS detector Ian Howley 7 December 2010 1 Motivation One of the primary LHC physics
More informationTagging Boosted Top Quarks and Higgs Bosons in ATLAS
agging Boosted op Quarks and Higgs Bosons in ALAS BOOS 05, University of Chicago Matt LeBlanc, on behalf of the ALAS Collaboration 0 th -4 th August 05 Overview Run-I op agging: ALAS-CONF-05-36 agging
More informationQCD Multijet Background and Systematic Uncertainties in Top Physics
QCD Multijet Background and Systematic Uncertainties in Top Physics Jin Wang On behalf of ATLAS, CMS, CDF and D0 Collaborations IHEP, China 2013-09-15, Top2013 1 Outline Introduction of QCD Multijet Background
More informationTop tagging at CMS. Torben Dreyer on behalf of the CMS Collaboration. BOOST 2017, Buffalo
Torben Dreyer on behalf of the CMS Collaboration BOOST 2017, Buffalo Motivation LHC at s = 13 TeV More top quarks with high momentum (Standard Model and new physics) Top tagging more important than ever
More informationJet Substructure. Adam Davison. University College London
Jet Substructure Adam Davison University College London 1 Outline Jets at the LHC Machine and ATLAS detector What is a jet? Jet substructure What is it? What can it do for us? Some ATLAS/Higgs bias here
More informationA search for t t resonances using 3.2 fb 1 of proton-proton collisions at 13 TeV: Boosted analysis
A search for t t resonances using 3.2 fb 1 of proton-proton collisions at 13 TeV: Boosted analysis Silvestre Marino Romano on behalf of ATLAS team LPC Clermont-Ferrand May 19, 2016 S. M. Romano ( LPC Clermont-Ferrand
More informationSearch for BSM Decaying to Top Quarks
1, Johns Hopkins Why 2? In many BSM models, third generation is special (esp. top) Easiest to study the spectrum of invariant masses, 1) Narrow resonance (
More informationEffects of Jet Substructure Selection in
Effects of Jet Substructure Selection in tt WbWb µνbqqb Ziggy Zacks Wesleyan University July 31, 2012 1 / 29 Optimization Optimize data selection from the semi-leptonic boosted tops analysis. Specifically
More informationResults on QCD jet production at the LHC (incl. Heavy flavours)
Results on QCD jet production at the LHC (incl. Heavy flavours) R. Seuster (TRIUMF) On behalf of the ATLAS and CMS collaborations Recontres du Vietnam August 11th 17th, 2013 Windows on the Universe Outline
More informationReconstructing low mass boosted A bb at LHCb
Summer student report - CERN 2014 Summer student: Petar Bokan Supervisor: Victor Coco Reconstructing low mass boosted A bb at LHCb ABSTRACT: LHCb has the ability to trigger low mass objects with high efficiency.
More informationATLAS Jet Reconstruction, Calibration, and Tagging
ALAS Jet Reconstruction, Calibration, and agging Steven Schramm On behalf of the ALAS Collaboration ICNFP 7 Crete, Greece August, 7 Steven Schramm (Université de Genève) Jet reconstruction, calibration,
More informationATLAS jet and missing energy reconstruction, calibration and performance in LHC Run-2
Prepared for submission to JINS International Conference on Instrumentation for Colliding Beam Physics 7 February - March, 7 Budker Institute of Nuclear Physics, Novosibirsk, Russia ALAS jet and missing
More informationPreparations for SUSY searches at the LHC
Preparations for SUSY searches at the LHC Alex Tapper UK HEP Forum: LHC First Results and Outlook, September 20-21 20. Outline Search strategy Examples with 70 nb Hadronic searches Leptonic searches (single
More informationTop-tagging at high jet multiplicity
Top-tagging at high jet multiplicity Sebastian Schätzel Universität Heidelberg, Germany Using Jet Substructure Workshop University of Oregon, Eugene, USA 23-26 April 2013 HEPTopTagger fat jet quantities
More informationPreparations for SUSY searches at the LHC
Preparations for SUSY searches at the LHC Alex Tapper UK HEP Forum: LHC First Results and Outlook, September 20-21 20. Outline Search strategy Examples with 70 nb -1 Hadronic searches Leptonic searches
More informationSearch for di-higgs to 4b with the ATLAS detector. Tony(Baojia)Tong, Harvard University CLHCP, PKU, Dec. 18, 2016
Search for di-higgs to 4b with the ATLAS detector Tony(Baojia)Tong, Harvard University CLHCP, PKU, Dec. 8, 6 Motivation Di-Higgs production Cross section small in SM: 8 TeV ~ fb (NNLO) 3 TeV ~ 38 fb (NNLO
More informationPhysics 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 informationDark matter searches and prospects at the ATLAS experiment
Dark matter searches and prospects at the ATLAS experiment Wendy Taylor (York University) for the ATLAS Collaboration TeVPA 2017 Columbus, Ohio, USA August 7-11, 2017 Dark Matter at ATLAS Use 13 TeV proton-proton
More informationPhysics 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 informationarxiv: v1 [hep-ex] 28 Aug 2017
Proceedings of the Fifth Annual LHCP AL-PHYS-PROC-7-99 November 9, 8 Boosted top production in ALAS and arxiv:78.864v [hep-ex] 8 Aug 7 Marino Romano On behalf of the ALAS and Collaborations, INFN, Sezione
More informationMono-X, Associate Production, and Dijet searches at the LHC
Mono-X, Associate Production, and Dijet searches at the LHC Emily (Millie) McDonald, The University of Melbourne CAASTRO-CoEPP Joint Workshop Melbourne, Australia Jan. 30 - Feb. 1 2017 M. McDonald, University
More informationJet physics in ATLAS. Paolo Francavilla. IFAE-Barcelona. Summer Institute LNF , QCD, Heavy Flavours and Higgs physics
Jet physics in ATLAS IFAE-Barcelona Summer Institute LNF-2012-2, QCD, Heavy Flavours and Higgs physics Frascati National Laboratories 27 June 2012 Jets in the LHC era At the Large Hadron Collider (LHC),
More informationColorful Physics for the Tevatron and LHC
Colorful Physics for the Tevatron and LHC Andy Haas, SLAC SMU Video Seminar February 21, 2011 Slide 1 What is color flow?? QCD color charge is conserved locally It flows, just like electric charge Quarks
More informationSearch for the Higgs Boson In HWW and HZZ final states with CMS detector. Dmytro Kovalskyi (UCSB)
Search for the Higgs Boson In HWW and HZZ final states with CMS detector Dmytro Kovalskyi (UCSB) Introduction WW and ZZ finals states dominate Higgs searches at Higgs Mass WW 2L2ν has best sensitivity
More informationRecent 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 informationSearch for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment
Search for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment MCTP Symposium 2012, University of Michigan, Ann Arbor, US Outline SM Higgs Boson production and decay Analysis based on
More informationMeasurement of Jet Energy Scale and Resolution at ATLAS and CMS at s = 8 TeV
Measurement of Jet Energy Scale and Resolution at ATLAS and CMS at s = 8 TeV EDSBlois 2015 02.07.2015 Dominik Haitz on behalf of the ATLAS and CMS Collaborations INSTITUT FÜR EXPERIMENTELLE KERNPHYSIK
More informationSearches for dark matter at CMS and ATLAS
Searches for dark matter at CMS and ATLAS K. Bierwagen Johannes Gutenberg University Mainz On behalf of the ATLAS and CMS Collaboration March 20, 2018 Introduction Astrophysical observations point to the
More informationSearch for the High-Mass Standard Model Higgs Boson with the ATLAS Detector
Search for the High-Mass Standard Model Higgs Boson with the ATLAS Detector Sylvie Brunet Indiana University on behalf of the ATLAS collaboration Sylvie Brunet, Tau Fake Rate Plans, 02/10/2008 SEARCH 2012
More informationPhysics at Tevatron. Koji Sato KEK Theory Meeting 2005 Particle Physics Phenomenology March 3, Contents
Physics at Tevatron Contents Koji Sato KEK Theory Meeting 5 Particle Physics Phenomenology March 3, 5 mass measurement Top physics cross section Top mass measurement SM Higgs search Tevatron Run II Started
More informationReview of physics results using jet substructure techniques in LHC Run1
EPJ Web of Conferences 9, 9 (5) DOI:.5/ epjconf/ 599 C Owned by the authors, published by EDP Sciences, 5 Review of physics results using jet substructure techniques in LHC Run Maeo Negrini,a On behalf
More informationCombination of Higgs boson searches at ATLAS
Combination of Higgs boson searches at ATLAS Second MCTP Spring Symposium on Higgs Boson Physics, University of Michigan 16 th -20 th April 2012 Gemma Wooden, University of Michigan On behalf of the ATLAS
More informationIdentification of the Higgs boson produced in association with top quark pairs in proton-proton
Identification of the Higgs boson produced in association with top quark pairs in proton-proton collision: an analysis of the final state containing three leptons with the ATLAS detector Valentina Vecchio,
More informationFlorencia Canelli On behalf of the ATLAS and CMS collaborations. University of Zürich TOP2014 Cannes, France
Florencia Canelli On behalf of the ATLAS and CMS collaborations University of Zürich TOP2014 Cannes, France Prepared with help from James Ferrando from ATLAS F. Canelli, University of Zürich TOP24 2 Largest
More informationFinal states with third generation quarks at 13 TeV. Pieter Everaerts. On Behalf of the ATLAS and CMS collaborations.
Final states with third generation quarks at 13 TeV Pieter Everaerts University of California, Los Angeles On Behalf of the ATLAS and CMS collaborations March 17, 2013 Pieter Everaerts Searches with 3rd
More informationCarlos Sandoval Universidad Antonio Nariño On behalf of the ATLAS collaboration DIS Kobe, Japan
Carlos Sandoval Universidad Antonio Nariño On behalf of the ATLAS collaboration DIS 2018 - Kobe, Japan 1 Search for long-lived massive particles (LLP) in events with displaced vertices (DV): arxiv:1710.04901v1
More informationEvidence for tth production at ATLAS
Evidence for tth production at ATLAS Rohin T Narayan on behalf of the ATLAS collaboration Nov-6-2017, Higgs couplings Heidelberg Motivation Fermion masses are generated through Yukawa interaction Heaviest
More informationHard And Soft QCD Physics In ATLAS
Hard And Soft QCD Physics In ALAS Stefanie Adomeit on behalf of the ALAS collaboration International Conference on New Frontiers in Physics - Crete, June -6, QCD Measurements in ALAS at LHC every kind
More informationarxiv: v1 [hep-ex] 7 Jan 2019
Top quarks and exotics at ATLAS and CMS Leonid Serkin on behalf of the ATLAS and CMS Collaborations 1 arxiv:1901.01765v1 [hep-ex] 7 Jan 2019 INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine and
More informationQCD 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 informationNew physics searches with top quarks at ATLAS
New physics searches with top quarks at ATLAS Marcel Vos (IFIC, CSIC/UV, Valencia, Spain) New phenomena discussion session IMFP2012, Benasque, Spain Top as a signature for new physics? Wishful thinking?:
More informationSearch for a heavy scalar boson decaying into a pair of Z bosons in the 2l2ν final state in CMS
Search for a heavy scalar boson decaying into a pair of Z bosons in the 2l2ν final state in CMS Li Yuan Beihang University CLHCP 2016 December 18, 2016 1 Outline Introduction Overview Analysis Strategy
More informationHow to find a Higgs boson. Jonathan Hays QMUL 12 th October 2012
How to find a Higgs boson Jonathan Hays QMUL 12 th October 2012 Outline Introducing the scalar boson Experimental overview Where and how to search Higgs properties Prospects and summary 12/10/2012 2 The
More informationSearch for single production of vector-like quarks decaying into a W-boson and a b-quark at 13 TeV
SNSN-33-63 November 0 06 Search for single production of vector-like quarks decaying into a W-boson and a b-quark at 3 TeV Dustin Biedermann on behalf of the ATLAS Collaboration Institut für Physik Humboldt-Universität
More informationSearch For W tb All-Hadronic. Kevin Nash
Search For W tb All-Hadronic Kevin Nash 1 Introduction Searching for BSM physics Top quarks play an important role New massive gauge bosons (W, Z ) Heavy quark partners (t,b ) Kaluza-Klein excitations
More informationSearches for BSM Physics in Events with Top Quarks (CMS)
Searches for BSM Physics in Events with Top Quarks (CMS) On behalf of the CMS collaboration SUSY 2014 Manchester, July 22nd 2014 The Top Quark Top quark special due to its high mass main responsible for
More informationTHE ATLAS TRIGGER SYSTEM UPGRADE AND PERFORMANCE IN RUN 2
THE ATLAS TRIGGER SYSTEM UPGRADE AND PERFORMANCE IN RUN 2 S. Shaw a on behalf of the ATLAS Collaboration University of Manchester E-mail: a savanna.marie.shaw@cern.ch The ATLAS trigger has been used very
More informationThe Top Quark Mass in the Muon+Jets Final State at s = 13 TeV in 2015 Data
The Top Quark Mass in the Muon+Jets Final State at s = 13 TeV in 2015 Data CMS PAS TOP6-022 55th Course of the ISSP, Erice Christoph Garbers, Nataliia Kovalchuk,Johannes Lange, Peter Schleper, Markus Seidel,
More informationttbar Background Estimation in the Search for b-associated MSSM Higgs Bosons Decaying to Tau-Pairs with ATLAS DPG Bonn, T 45. Higgs
ttbar Background Estimation in the Search for b-associated MSSM Higgs Bosons Decaying to Tau-Pairs with ATLAS DPG Bonn, T 45. Higgs 17.03.2010 Jana Schaarschmidt Supervised by Michael Kobel, Wolfgang Mader
More informationEarly physics with Atlas at LHC
Early physics with Atlas at LHC Bellisario Esposito (INFN-Frascati) On behalf of the Atlas Collaboration Outline Atlas Experiment Physics goals Next LHC run conditions Physics processes observable with
More informationHints from Run 1 and Prospects from Run 2 at CMS. Qiang Li Peking University, Beijing, China
Hints from Run 1 and Prospects from Run 2 at CMS Qiang Li Peking University, Beijing, China 2015.07.02 LHC-CMS 2 2010-2012: Successful Run1 3 2010-2012: Successful Run1 and Standard Model Rare B decay,
More informationTop production at the Tevatron
Top production at the Tevatron Bob Hirosky University of Virginia for the CDF and D0 Collaborations Moriond Moriond QCD 2017 1 Top production at the Tevatron Top mass from differential cross section Polarization
More informationATLAS Discovery Potential of the Standard Model Higgs Boson
ATLAS Discovery Potential of the Standard Model Higgs Boson Christian Weiser University of Freiburg (on behalf of the ATLAS Collaboration) 14th Lomonosov Conference on Elementary Particle Physics Moscow,
More informationHiggs Boson Searches at ATLAS
Higgs Boson Searches at ATLAS Jianming Qian University of Michigan October 5, 2011 Maryland/John Hopkins Joint Seminar, October 5, 2011 Jianming Qian (University of Michigan) 1 Standard Model Standard
More informationFuture of LHC. Beate Heinemann. University of California, Berkeley Lawrence Berkeley National Laboratory
Future of LHC Beate Heinemann University of California, Berkeley Lawrence Berkeley National Laboratory PiTP, July 2013 1 LHC Run 1: 2009-2012 25 fb -1 of 7+8 TeV pp data Higgs boson found! Looks like SM
More informationHighlights of top quark measurements in hadronic final states at ATLAS
Highlights of top quark measurements in hadronic final states at ATLAS Serena Palazzo 1,2,, on behalf of the ATLAS Collaboration 1 Università della Calabria 2 INFN Cosenza Abstract. Measurements of inclusive
More informationTop quark at LHC. M. Villa. Bologna, oggi
Top quark at LHC M. Villa Bologna, oggi 1 Outline Top quark characteristics Top production and decay Measurements 2 Outline Top quark characteristics Top production and decay Measurements 3 Top quark I.D.
More informationarxiv: v1 [hep-ex] 8 Jan 2018
Top mass measurements in ATLAS and CMS arxiv:8.239v [hep-ex] 8 Jan 28 A. CASTRO University of Bologna and INFN, Bologna, Italy On behalf of the ATLAS and CMS Collaborations Abstract Top quarks are produced
More informationHiggs search in WW * and ZZ *
Higgs search in WW * and ZZ * Emanuele Di Marco on behalf of CMS collaboration La Sapienza Università di Roma & INFN Roma1 July, 29 2011 1 Higgs production at LHC gluon fusion (gg H) gg H is the dominant
More informationPoS(CKM2016)117. Recent inclusive tt cross section measurements. Aruna Kumar Nayak
Recent inclusive tt cross section measurements Institute of Physics, Bhubaneswar, India E-mail: Aruna.Nayak@cern.ch Results of the recent measurements for the inclusive tt production cross section in the
More informationEvidence for Higgs Boson Decays to a Pair of τ-leptons
Evidence for Higgs Boson Decays to a Pair of τ-leptons ET miss = 119 GeV μ (pt=6 GeV) τhad (pt=96 GeV) mττ =19 GeV Nils Ruthmann mjj =65 GeV Nils Ruthmann (Universität Freiburg) On Behalf of the ATLAS
More informationTop Quark Production at the LHC. Masato Aoki (Nagoya University, Japan) For the ATLAS, CMS Collaborations
Top Quark Production at the LHC Masato Aoki (Nagoya University, Japan) For the ATLAS, CMS Collaborations Phys. Rev. D 83 (2011) 091503, Phys. Rev. D 82 (2010) 054018, Phys. Rev. D 81 (2010) 054028, Comput.
More informationW/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 informationStudies on hadronic top decays
Studies on hadronic top decays José M. Clavijo, Havana University, Cuba September 6, 208 Supervisors: Daniela Dominguez Damiani and Hannes Jung Abstract Top events in the boosted regime are studied using
More informationTop quark pair property measurements and tt+x, using the ATLAS detector at the LHC
Top quark pair property measurements and tt+x, using the ATLAS detector at the LHC On behalf of the ATLAS collaboration II. Physikalisches Institut 25th International Workshop on Deep Inelastic Scattering
More informationMeasurement 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 informationVBF SM Higgs boson searches with ATLAS
VBF SM Higgs boson searches with Stefania Xella (for the collaboration) Niels Bohr Institute, Copenhagen University, Denmark E-mail: xella@nbi.dk The observation of a Standard Model Higgs boson produced
More informationHiggs couplings and mass measurements with ATLAS. Krisztian Peters CERN On behalf of the ATLAS Collaboration
Higgs couplings and mass measurements with ATLAS CERN On behalf of the ATLAS Collaboration July observation: qualitative picture A single state observed around ~125 GeV Qualitatively all observations consistent
More informationSearches at the LHC: Results from first data
Searches at the LHC: Results from first data 23 March, 2011 Satyaki Bhattacharya SINP, Kolkata Plan of talk CMS Higgs, SUSY, Exotica results from Moriond Higgs SUSY Exotica main emphasis In exotica part
More informationJet reconstruction. What are jets? How can we relate the measured jets to the underlying physics process? Calibration of jets Tagging of jets
Jet reconstruction What are jets? How can we relate the measured jets to the underlying physics process? Calibration of jets Tagging of jets 1 What are jets? Jets for non- particle physicists Jets for
More informationtt + X production at ATLAS and CMS
tt + X production at ATLAS and CMS Antonio Sidoti on behalf of the ATLAS and CMS collaborations Istituto Nazionale Fisica Nucleare Sezione di Bologna Top quark Try to avoid repetitions with M. Aldaya Martin
More informationYoshikazu NAGAI (CPPM, Aix Marseille Université)
Search for the Standard Model Higgs boson decaying into a b quark pair at ATLAS Yoshikazu NAGAI (CPPM, Aix Marseille Université) CPPM Seminar October 20, 2014 Contents Introduction Analysis overview Result
More informationSearching for Beyond Standard Model Physics with Top Quarks at the ATLAS Detector
Searching for Beyond Standard Model Physics with Top Quarks at the ATLAS Detector (University of Hong Kong) Topical Mini-Workshop of the New Physics at the TeraScale @ Tsung-Dao Lee Institute, SJTU Introduction
More informationTop quark mass at ATLAS and CMS
Top quark mass at ATLAS and CMS (Introduction) Direct measurements Template/Ideogram based Indirect measurements Unfolded shapes/cross sections Conclusions & Outlook Andreas Jung for the ATLAS & CMS collaboration
More informationLatest results on the SM Higgs boson in the WW decay channel using the ATLAS detector
Latest results on the SM iggs boson in the decay channel using the detector arxiv:188.954, accepted by PRB Claudia Bertella, on behalf of Collaboration The 4th China LC Physics Workshop (CLCP 218) 21-December-218
More informationTaller de Altas Energías Michael Holzbock September 7, LMU Munich
Search for top squark pair production in final states with two τ leptons, jets, and missing transverse momentum in s = TeV pp-collisions with the ATLAS detector Taller de Altas Energías 6 Michael Holzbock
More informationSearch for heavy BSM particles coupling to third generation quarks at CMS
Search for heavy BSM particles coupling to third generation quarks at on behalf of the Collaboration University of Hamburg E-mail: mareike.meyer@desy.de Many models of physics beyond the Standard Model
More informationUpgrade of ATLAS and CMS for High Luminosity LHC: Detector performance and Physics potential
IL NUOVO CIMENTO 4 C (27) 8 DOI.393/ncc/i27-78-7 Colloquia: IFAE 26 Upgrade of ATLAS and CMS for High Luminosity LHC: Detector performance and Physics potential M. Testa LNF-INFN - Frascati (RM), Italy
More informationImproving Jet Substructure Performance in ATLAS with Unified Tracking and Calorimeter Inputs Connecting The Dots 2018
Improving Jet Substructure Performance in ATLAS with Unified Tracking and Calorimeter Inputs Connecting The Dots 2018 Roland Jansky, University of Geneva 21st March 2018 Jets at the Energy Frontier event
More informationInclusive top pair production at Tevatron and LHC in electron/muon final states
Inclusive top pair production at Tevatron and LHC in electron/muon final states Andreas Jung for the ATLAS, CDF, CMS and D Collaboration Fermilab, DAB5 - MS 357, P.O. Box 5, Batavia, IL, 651, USA DOI:
More informationHigh 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 informationSearch for a SM Higgs-like boson decaying into WW lvqq' using exclusive bins of jet multiplicity in pp collision at s = 8TeV
Search for a SM Higgs-like boson decaying into WW lvqq' using exclusive bins of jet multiplicity in pp collision at s = 8TeV PhD Student: Supervisor: Alessio Ghezzi Seminario di dottorato 25/09/2014 Introduction
More informationGeorge Bakas For the NTUA CMS Group
George Bakas For the NTUA CMS Group Top quark CMS Experiment Boosted Jets Analysis Overview 2 Mass : 172.44 ± 0.13 GeV c 2 Top Quark decay W + + b ( ҧ t W - + തb) Top pair production q + തq t + tҧ g +
More informationSubstructure at CMS:
Substructure at CMS: Experimental Perspective (SUNY Buffalo) Terajets 2013: Using Jet Substructure 1 Introduction Use one example analysis (Z tt all hadronic) to bring up some experimental discussion topics
More informationZinonas Zinonos Georg-August-Universität Göttingen
Zinonas Zinonos Georg-August-Universität Göttingen Discovery of a neutral scalar particle at LHC of mass ~125 GeV has provided important insight into the electroweak symmetry breaking mechanism! Experimental
More informationLatest results on the SM Higgs boson in the WW decay channel using the ATLAS detector ATLAS-CONF
Latest results on the SM iggs boson in the WW decay channel using the ATLAS detector ATLAS-CONF-6- C. Bertella C. Bertella Second China LC Physics Workshop: CLCP 6 7-December 6 WW lνlν WW channel well-suited
More informationOn behalf of the ATLAS and CMS Collaborations
On behalf of the ATLAS and CMS Collaborations Reza Goldouzian Université libre de Bruxelles 1 Ø There are several models of physics beyond the standard model require new particles that couple to quarks
More informationCDF top quark " $ )(! # % & '
$% CDF quark 7 3 5 ( "#! Tevatron Run II Started Spring 1. proton-antiproton collider with (Run I :. antiproton recycler commissioning electron cooling operational by Summer 5. increase in luminosity.
More informationSearch for Higgs to tt at CMS
Search for Higgs to tt at CMS Arun Nayak IRFU/SPP, CEA, Saclay 11/10/2013 Aperos du SPP 1 Why Higgs to tt? Introduction Most sensitive channel to probe lepton couplings o Important to establish SM predictions
More informationRecent searches for new particles using 13 TeV data with ATLAS at the LHC
Recent searches for new particles using 13 TeV data with ATLAS at the LHC Vivek Jain (on behalf of the ATLAS Collaboration) State University of New York, Albany MIAMI2015 Dec 19, 2015 Beyond the Standard
More informationReview of ATLAS experimental results (II)
Review of ATLAS experimental results (II) Rachid Mazini Academia Sinica Taiwan CTEQ 2012 summer school Lima, Peru 30 July -8 August Rachid Mazini, Academia Sinica 1 Outline part II Higgs searches H, H
More informationSUSY searches at LHC and HL-LHC perspectives
SUSY searches at LHC and HL-LHC perspectives Maximilian Goblirsch-Kolb, on behalf of the ATLAS and CMS collaborations 26.10.2017, LCWS 2017, Strasbourg SUSY particle production in p-p collisions Two main
More information