Higgs Pair Production: NLO Matching Uncertainties
|
|
|
- Meredith French
- 5 years ago
- Views:
Transcription
1 Higgs Pair Production: NLO Matching Uncertainties Silvan Kuttimalai in collaboration with Stephen Jones November 7th, 2017 Higgs Couplings Workshop, Heidelberg
2 Introduction
3 Motivation: the Higgs Potential V = 2 v 2 H vh v 2 H 4 SM 2 = SM 3 = SM 4 = m2 H 2v 2 3 can be measured in Higgs pair production Experimentally challenging (pp! HH) (pp! H) 10 3 Prospects for HL-LHC: around 10 % - 50 % precision on 3 Theoretically also extremely challenging 1
4 Higgs Pair Production at NLO Born Virtual Real Born and real corrections Automated 1-loop tools: OpenLoops, GoSam, MadLoop, Recola,... Infrared subtraction Born UV finite, use standard techniques: Catani-Seymour, FKS,... Virtual corrections Two-loop integrals, massive propagators, external masses Very hard ) not available until recently 2
5 Low-Energy Approximation t HEFT m t!1 Higgs E ective Field Theory Take into account only top quark contributions Work in low-energy limit: ŝ mt 2 ) Gives rise to point-like Higgs-gluon interactions ) Reduces complexity immensely ) Validity highly questionable, however: m HH > m t 3
6 New Level of Precision Borowka et al. JHEP 10 (2016) Two-loop virtuals numerically evaluated Details: Gudrun Heinrich s talk HEFT-based approximations inaccurate NLO corrections large, well outside LO uncertainties 4
7 Motivation New level of precision NLO corrections Full finite top mass e ects ) Meaningful fixed-order uncertainties Fixed-order NLO not su cient Small p? HH region: spoiled by logs n s log m p? HH/m HH Requires matching to parton shower / resummation ) Need careful re-assessment of PS / matching uncertainties 5
8 Motivation Heinrich et al.: JHEP 08 (2017) 6
9 Loop-Induced Processes at NLO in Sherpa Born and real corrections Interfaced from OpenLoops Interface extended for color- and spin-correlated amplitudes Infrared Substraction Use Catani-Seymour method Re-implemented for loop-induced external amplitudes Process handling and interface to parton showers Re-implemented for loop-induced external amplitudes Two parton showers available: CS shower / Dire shower [Schumann, Krauss, JHEP 03 (2008)] [Höche, Prestel, Eur.Phys.J. C75 (2015)] 7
10 Parton Shower E ects at LO
11 ds/dp? HH [pb/gev] Ratio SHERPA HEFT pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s LO+PS Results p s = 14 TeV HEFT p HH? [GeV] P M 2 1 M 2 P: process independent parton shower kernels 8
12 ds/dp? HH [pb/gev] Ratio SHERPA HEFT pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s LO+PS Results p s = 14 TeV HEFT P M 2 M p HH? [GeV] Uncertainty bands on LO+PS: 1 µ PS 2{ m HH 4, m HH 2, m HH 1 } µ PS implements phase space restriction: t( 1 ) <µ 2 PS µ PS = p s power shower, full phase space open 8
13 LO+PS Results ds/dp? HH [pb/gev] SHERPA HEFT pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s p s = 14 TeV HEFT ds/dp? HH [pb/gev] SHERPA Full SM pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s p s = 14 TeV Full SM Ratio Ratio p HH? [GeV] Qualitative di erences between HEFT and full SM HEFT: PS approximation underestimates fixed-order Full SM: PS approximation overestimates fixed-order Sharply falling spectrum above m t in full SM p HH? [GeV] Parton shower kernels don t know hard process 8
14 Parton Shower E ects at NLO
15 NLO Parton Shower Matching: NLO = Z apple Z B( B )+V( B )+ B( B )P( 1 ) (µ 2 PS t)d 1 d B Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R Modified subtraction Use parton shower splitting kernels P for subtraction Restrict subtraction terms to parton shower phase space 9
16 NLO Parton Shower Matching: NLO = Z apple Z B( B )+V( B )+ B( B )P( 1 ) (µ 2 PS t)d 1 d B Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R Modified subtraction Use parton shower splitting kernels P for subtraction Restrict subtraction terms to parton shower phase space 9
17 NLO Parton Shower Matching: NLO = Z apple Z B( B )+V( B )+ B( B )P( 1 ) (µ 2 PS t)d 1 d B Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R Modified subtraction Use parton shower splitting kernels P for subtraction Restrict subtraction terms to parton shower phase space 9
18 NLO Parton Shower Matching: NLO = Z B( B )d B S-events M 2 Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R H-events M 2 Interplay between parton shower and fixed order 10
19 NLO Parton Shower Matching: = Z apple B( B ) Z (µ 2 PS, t 0 )+ Sudakov factor: no-emission probability between µ 2 PS and t 0 (µ 2 PS, t)p( 1 ) (µ 2 PS t)d 1 d B Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R P: splittingkernel Interplay between parton shower and fixed order 11
20 NLO Parton Shower Matching: = Z apple B( B ) Z (µ 2 PS, t 0 )+ (µ 2 PS, t)p( 1 ) (µ 2 PS t)d 1 d B Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R Interplay between parton shower and fixed order Consider observable insensitive to born kinematics (p HH? ) 11
21 NLO Parton Shower Matching: = Z B( B ) (µ 2 PS, t)p( 1 ) (µ 2 PS t)d 1 d B + S-events Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R H-events Interplay between parton shower and fixed order Consider observable insensitive to born kinematics (p HH? ) 11
22 NLO Parton Shower Matching: = Z B( B ) (µ 2 PS, t)p( 1 ) (µ 2 PS t)d 1 d B + S-events Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R H-events Interplay between parton shower and fixed order Consider observable insensitive to born kinematics (p HH? ) Focus on soft region: t µ 2 PS ) recover LO+PS with local K-factor 11
23 NLO Parton Shower Matching: = Z B( B ) (µ 2 PS, t)p( 1 ) (µ 2 PS t)d 1 d B + S-events Z h i + R( R ) B( B )P( 1 ) (µ 2 PS t) d R H-events Interplay between parton shower and fixed order Consider observable insensitive to born kinematics (p HH? ) Focus on soft region: t µ 2 PS ) recover LO+PS with local K-factor Focus on hard region: t µ 2 PS ) recover fixed order, assuming B B 11
24 NLO Results ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, CS shower pp! HH p s = 14 TeV HEFT HEFT approximation µ PS cancellation between S- and H-events PS uncertainties reduced Recover fixed-order in tail Ratio to FO Ratio to MC@NLO S-events H-events p HH? [GeV] B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events 12
25 NLO Results ds/dp? HH [pb/gev] Ratio to FO Ratio to SHERPA Fixed-Order MC@NLO, CS shower S-events H-events pp! HH p s = 14 TeV HEFT p HH? [GeV] HEFT approximation µ PS cancellation between S- and H-events PS uncertainties reduced Recover fixed-order in tail B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events ( B B) P R 12
26 NLO Results ds/dp? HH [pb/gev] Ratio to FO Ratio to SHERPA Fixed-Order MC@NLO, CS shower S-events H-events pp! HH p s = 14 TeV Full SM p HH? [GeV] Full SM much larger uncertainties PS e ects extend into tail large µ PS ) don t recover fixed order B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events ( B B) P R 13
27 NLO Results ds/dp? HH [pb/gev] Ratio to FO Ratio to MC@NLO pp! HH p s = 14 TeV Full SM SHERPA Fixed-Order MC@NLO, CS Dire shower S-events H-events p? HH Full SM much larger uncertainties PS e ects extend into tail large µ PS ) don t recover fixed order B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events ( B B) P R 13
28 Comparison to Literature: NLO+PS ds/dp? HH [fb/gev] Sherpa, Dire Shower Sherpa, CS Shower MadGraph5 + Pythia Powheg-Box + Pythia Heinrich et al.: JHEP 08 (2017) Larger di erences in peak region due to di erences in algorithms beyond choice of µ PS : 15 % Ratio to fixed-order MC@NLO results within uncertainties in tail MadGraph uncertainties larger Ratio to fixed-order p HH? [GeV] POWHEG: flat excess in tail known feature of matching method somewhat suppressed through damping factor h damp = 250 GeV 14
29 Comparison to Literature: Analytic Resummation ds/dp? HH [fb/gev] SHERPA pp! HH p s = 14 TeV Full SM Ferrera, Pires: JHEP 02 (2017) Next-to-leading log (NLL) parametrically equivalent to parton shower Ratio to NLO+NLL NLO+NLL [Ferrera, Pires, 2017] MC@NLO, Dire shower MC@NLO, CS shower p HH? [GeV] Uncertainties on NLO+NLL: 3% near p? HH 20GeV 10 % near p? HH 100GeV Good agreement within uncertainties 15
30 Conclusions Recent advances at fixed-order ) reduced uncertainties Studied uncertainties introduced though parton shower matching Found good agreement with analytic resummation Matching to fixed-order at large p HH? requires judicious choice of µ PS µ PS variations may exceed FO uncertainties ) Is µ PS source of uncertainty or tuning parameter? 16
31 Backup
32 E ects on Fixed-Order Uncertainties ds/dp? HH [pb/gev] SHERPA µ f /r variations Fixed-Order MC@NLO, Dire shower pp! HH p s = 14 TeV Full SM Full SM At small p? HH : NLO uncertainties seed cross section ( B) moreinclusive At large p HH? : LO uncertainties seed cross section (R) 1-jet exclusive Ratio to FO Ratio to MC@NLO S-events H-events p HH? [GeV] B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events
33 NLO+PS: Alternative Comparison Plot ds/dp? HH [fb/gev] Sherpa, Dire Shower Sherpa, CS Shower MadGraph5 + Pythia Powheg-Box + Pythia Ratio to fixed-order Ratio to fixed-order p HH? [GeV]
34 Replacing B by B ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, Dire shower ( B! B) pp! HH p s = 14 TeV Full SM Ratio to FO Ratio to MC@NLO S-events H-events p HH? [GeV] B( B ) (µ 2 PS, t)p( 1) (µ 2 PS t)d B d 1 S-events h i R( R ) B( B )P( 1) (µ 2 PS t) d R H-events
35 LO+PS Results: CS Shower ds/dp? HH [pb/gev] SHERPA HEFT pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s p s = 14 TeV HEFT ds/dp? HH [pb/gev] SHERPA Full SM pp! HH + j pp! HH +CSshower pp! HH +CSshower,µ PS = p s p s = 14 TeV Full SM Ratio Ratio p HH? [GeV] p HH? [GeV] Uncertainty bands on LO+PS: µ CS PS 2{m HH 4, m HH 2, m HH 1 } µ Dire PS 2{m HH 8, m HH 4, m HH 2 } µ CS PS = p s power shower µ Dire PS = m HH 2 power shower
36 LO+PS Results: Dire Shower ds/dp? HH [pb/gev] SHERPA HEFT pp! HH + j pp! HH +Direshower p s = 14 TeV HEFT ds/dp? HH [pb/gev] SHERPA Full SM pp! HH + j pp! HH +Direshower p s = 14 TeV Full SM Ratio Ratio p HH? [GeV] p HH? [GeV] Uncertainty bands on LO+PS: µ CS PS 2{m HH 4, m HH 2, m HH 1 } µ Dire PS 2{m HH 8, m HH 4, m HH 2 } µ CS PS = p s power shower µ Dire PS = m HH 2 power shower
37 CS shower vs Dire: HEFT ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, CS shower pp! HH p s = 14 TeV HEFT ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, Dire shower pp! HH p s = 14 TeV HEFT Ratio to FO Ratio to FO Ratio to MC@NLO S-events H-events p HH? [GeV] Ratio to MC@NLO S-events H-events p HH? [GeV]
38 CS shower vs Dire: Full SM ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, CS shower pp! HH p s = 14 TeV Full SM ds/dp? HH [pb/gev] SHERPA Fixed-Order MC@NLO, Dire shower pp! HH p s = 14 TeV Full SM Ratio to FO Ratio to FO Ratio to MC@NLO S-events H-events p HH? [GeV] Ratio to MC@NLO S-events H-events p HH? [GeV]
39 Other Observables ds/dp j? [pb/gev] SHERPA Fixed-Order MC@NLO, Dire shower MC@NLO, CS shower pp! HH p s = 14 TeV Full SM ds/dht SHERPA Fixed-Order MC@NLO, Dire shower MC@NLO, CS shower pp! HH p s = 14 TeV Full SM Ratio to FO Ratio to Dire p j? [GeV] HT [GeV]
40 Other Observables ds/d HH [pb/gev] SHERPA Fixed-Order MC@NLO, Dire shower MC@NLO, CS shower pp! HH p s = 14 TeV Full SM Ratio to FO HH
41 Single Higgs ds/dp H? [pb/gev] Higgs boson transverse momentum Fixed-order HEFT Fixed-order LO+PS µ PS = Ratio p H? [GeV]
42 p a p b Parton shower kinematics Q p j H H ˆt =(p a p j ) 2 û =(p b p j ) 2 ŝ =(p a + p b ) 2 v = p ap j p a p b = ˆt ŝ 0 w = p bp j p a p b = û ŝ 0 ŝ + ˆt +û = Q 2 ) v + w =(1 Q 2 ŝ ) < 1 ) vw < 1 4 t Dire Q 2 = (p ap j )(p b p j ) (p a p b ) 2 = vw t Dire < Q2 4 t CSS Q 2 = vw 1 (v + w).
43 Parton Shower Simulations 1 M 2 P M 2 + P M 2 1 Soft and Collinear Limit Hardness parameter / evolution variable t( 1 )! 0 Matrix elements factorize Derive process independent splitting kernels P Generate soft/collinear emissions probabilistically according to P Parton shower scale implements phase space restriction: t( 1 ) <µ 2 PS
44 Parton Shower Simulations M 2 P 1 M 2 + P M 2 1 Sudakov form factor " Z # t1 (t 1, t 0 )=exp P( 1 )d 1 t 0 No-emission probability between scales t 0 and t 1 Parton shower scale implements phase space restriction: t( 1 ) <µ 2 PS
45 Parton Shower Simulations M 2 P 1 M 2 + P M 2 1 Leading order plus parton shower cross section LO+PS = Z apple B( B ) Z µ 2 (µ 2 PS PS, t 0 )+ (µ 2 PS, t( 1 ))P( 1 ) d 1 d B t 0 no emission hardest emission at t( 1 ) Parton shower scale implements phase space restriction: t( 1 ) <µ 2 PS
46 POWHEG NLO = Z apple Z B( B )+V( B )+ R( B, 1)d 1 d B + Z R( R ) R( R ) d R P = R B
47 POWHEG NLO = Z apple Z B( B )+V( B )+ + Z " R( R ) h 2 damp h 2 damp p? 2 + R( R ) h2 damp p? 2 + R( B, 1)d 1 d B h2 damp # d R P = h damp 2 p? 2 R +h2 damp B
Multijet merging at NLO
Multijet merging at Institute for Particle Physics Phenomenology 09/0/0 arxiv:.0, arxiv:0.588 arxiv:07.5030, arxiv:07.503 arxiv:08.85 Multijet merging at 0000 0 0 0 0 0 0 0 0 00 00000 00000 00000 00000
Uncertainties in NLO+PS matched calculations of inclusive jet and dijet production
Uncertainties in NLO+PS matched calculations of inclusive jet and dijet production Institute for Particle Physics Phenomenology 26/09/202 arxiv:.220, arxiv:208.285 Uncertainties in NLO+PS matched calculations
Understanding Parton Showers
Understanding Parton Showers Zoltán Nagy DESY in collaboration with Dave Soper Introduction Pile-up events 7 vertices 2009 single vertex reconstructed! 2011 2010 4 vertices 25 vertices 2012 Introduction
update to 29/11/2012
pp H + n jets with SHERPA update to 29/11/2012 S. Höche, F. Krauss, G. Luisoni, M. Schönherr, F. Siegert Institute for Particle Physics Phenomenology 20/12/2012 pp H + n jets with SHERPA update to 29/11/2012
arxiv: v1 [hep-ph] 3 Jul 2010
![arxiv: v1 [hep-ph] 3 Jul 2010](/thumbs/91/106377961.jpg "arxiv: v1 [hep-ph] 3 Jul 2010")
arxiv:1007.0498v1 [hep-ph 3 Jul 2010 Single-top production with the POWHEG method IPPP, Durham University E-mail: emanuele.re@durham.ac.uk We describe briefly the POWHEG method and present results for
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
NLO QCD+EW predictions for 2l2ν production
NLO QCD+E predictions for 2l2ν production Marek Schönherr Universität ürich urich 8 May 207 Marek Schönherr NLO QCD+E predictions for 2l2ν production /20 NLO E corrections fixed-order next-to-leading order
Matching & Merging of Parton Showers and Matrix Elements
Matching & Merging of Parton Showers and Matrix Elements Frank Krauss Institute for Particle Physics Phenomenology Durham University CTEQ school, Pittsburgh, 2./3.7.203 Outline Introduction: Why precision
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
Recent developments in the POWHEG BOX
Recent developments in the POWHEG BOX Emanuele Re IPPP, Durham University Standard Model @ LHC Durham, 12 April 2011 in collaboration with S. Alioli, K. Hamilton, P. Nason and C. Oleari Outline Quick description
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:
Mauro Moretti Dip. di Fisica, Univ. di Ferrara INFN Sezione di Ferrara ALPGEN. LOOPFESTV, SLAC,19-21 July 2006
Mauro Moretti Dip. di Fisica, Univ. di Ferrara INFN Sezione di Ferrara ALPGEN LOOPFESTV, SLAC,19-21 July 2006 ALPGEN is hep-ph 0206293 M.Mangano, M.Moretti, F.Piccinini, R.Pittau and A.Polosa A (tree level)
QCD resummation for collider observables. Pier F. Monni Rudolf Peierls Centre for Theoretical Physics University of Oxford
QCD resummation for collider observables Pier F. Monni Rudolf Peierls Centre for Theoretical Physics University of Oxford Particle Physics Seminar - University of Birmingham, 15 June 2016 Quest for precision
Recent Advances in QCD Event Generators
Durham University Recent Advances in QCD Event Generators Peter Richardson IPPP, Durham University Bonn Seminar 27 th January 1 Introduction Monte Carlo event generators are essential for experimental
VH production at the LHC: recent theory progress
VH production at the LHC: recent theory progress Giancarlo Ferrera Università di Milano & INFN Milano LHC Higgs Cross Section Working Group CERN June 12th 214 Motivations Associated vector boson Higgs
NNLOPS predictions for Higgs boson production
NNLOPS predictions for Higgs boson production Emanuele Re Rudolf Peierls Centre for Theoretical Physics, University of Oxford GGI Florence, 12 September 2014 Outline brief motivation method used results
Automation of NLO computations using the FKS subtraction method
Automation of NLO computations using the FKS subtraction method Institute for Theoretical Physics, Universität Zürich E-mail: frederix@physik.uzh.ch In this talk the FKS subtraction method for next-to-leading
NLO for Higgs signals
NLO for Higgs signals Gudrun Heinrich Max Planck Institute for Physics, Munich P.Meridiani, EPS 2017 P.Meridiani, EPS 2017 we need to be sure about the systematic uncertainties to see something like this
A shower algorithm based on the dipole formalism. Stefan Weinzierl
A shower algorithm based on the dipole formalism Stefan Weinzierl Universität Mainz in collaboration with M. Dinsdale and M. Ternick Introduction: I.: II: III: Event generators and perturbative calculations
Jets at the LHC. New Possibilities. Jeppe R. Andersen in collaboration with Jennifer M. Smillie. Blois workshop, Dec
Jets at the LHC New Possibilities Jeppe R. Andersen in collaboration with Jennifer M. Smillie Blois workshop, Dec 17 2011 Jeppe R. Andersen (CP 3 -Origins) Jets at the LHC Blois Workshop, Dec. 17 2011
Predictive Monte Carlo tools for the LHC
Predictive Monte Carlo tools for the LHC Centre for Cosmology, Particle Physics and Phenomenology (CP3), BelgiuM Lecture III CERN Academic Training Lectures - May 2012 1 PLAN Basics : LO predictions and
Recent developments. Monte-Carlo Event Generators
Recent developments in Monte-Carlo Event Generators Marek Schönherr Universität Zürich ISMD 205 Wildbad Kreuth Marek Schönherr /28 Contents Parton shower developments Higher precision in parton showers
GoSam: Automated One Loop Calculations within and beyond the SM
GoSam: Automated One Loop Calculations within and beyond the SM Nicolas Greiner Max-Planck Institute for Physics in collaboration with G.Cullen,H.vanDeurzen,G.Heinrich,G.Luisoni,P.Mastrolia,E.Mirabella,G.Ossola,T.Peraro,J.Schlenk,
NLO QCD corrections to pp W ± Z γ with leptonic decays
NLO QCD corrections to pp W ± Z γ in collaboration with F. Campanario, H. Rzehak and D. Zeppenfeld Michael Rauch March 2010 I NSTITUTE FOR T HEORETICAL P HYSICS KIT University of the State of Baden-Wuerttemberg
NLO merging in t t+jets 1
merging in t t+jets Institute for Particle Physics Phenomenology EPS 2013, Stockholm, 18/07/2013 arxiv:1306.2703 in collaboration with S. Höche, J. Huang, G. Luisoni, J. Winter merging in t t+jets 1 Contents
arxiv: v1 [hep-ph] 18 Dec 2014
![arxiv: v1 [hep-ph] 18 Dec 2014](/thumbs/76/73170847.jpg "arxiv: v1 [hep-ph] 18 Dec 2014")
arxiv:1412.6026v1 [hep-ph] 18 Dec 2014 Monte Carlo Tools for charged Higgs boson production Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, D-48149
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
Measurements of the production of a vector boson in association with jets in the ATLAS and CMS detectors
Measurements of the production of a vector boson in association with s in the ALAS and CMS detectors Vieri Candelise University of rieste and INFN rieste, Via Valerio 2, 3428, rieste, Italy Abstract. he
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
Outline Motivations for ILC: e + e γ/z q qg LHC: pp l + l + jet (q q l + l g + qg l + l q + qg l + l q) Existing literature The complete EW one-loop c
Complete electroweak corrections to e + e 3 jets C.M. Carloni Calame INFN & University of Southampton Workshop LC08: e + e Physics at TeV scale September 22-25, 2008 in collaboration with S. Moretti, F.
arxiv:hep-ph/ v1 25 Sep 2002
hep-ph/0209302 Direct Higgs production at hadron colliders arxiv:hep-ph/0209302v1 25 Sep 2002 Massimiliano Grazzini (a,b) (a) Dipartimento di Fisica, Università di Firenze, I-50019 Sesto Fiorentino, Florence,
Anomalous gauge couplings in SHERPA
Anomalous gauge couplings in SHERPA Institute for Particle Physics Phenomenology Dresden, 02/10/2013 Anomalous gauge couplings in SHERPA 1 Contents 1 Status of SHERPA 2 Anomalous gauge coupling model in
AN INTRODUCTION TO QCD
AN INTRODUCTION TO QCD Frank Petriello Northwestern U. & ANL TASI 2013: The Higgs Boson and Beyond June 3-7, 2013 1 Outline We ll begin with motivation for the continued study of QCD, especially in the
The Higgs pt distribution
The Higgs pt distribution Chris Wever (TUM) In collaboration with: F. Caola, K. Kudashkin, J. Lindert, K. Melnikov, P. Monni, L. Tancredi GGI: Amplitudes in the LHC era, Florence 16 Oktober, 2018 Outline
Status of Higgs and jet physics. Andrea Banfi
Status of Higgs and jet physics Andrea Banfi Outline Importance of jet physics in LHC Higgs analyses Zero-jet cross section NNLL+NNLO resummations Progress in Monte Carlo event generators One-jet cross
Vector-Boson-Fusion: Parton-shower and Anomalous-coupling Effects
Vector-Boson-Fusion: Parton-shower and Anomalous-coupling Effects Michael Rauch 25 Jul 2016 INSTITUTE FOR THEORETICAL PHYSICS KIT University of the State of Baden-uerttemberg and National Research Center
arxiv: v1 [hep-ex] 15 Jan 2019
![arxiv: v1 [hep-ex] 15 Jan 2019](/thumbs/88/114699349.jpg "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
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
Geneva: Event Generation at NLO
Geneva: Event Generation at NLO Saba Zuberi UC Berkeley/LBL Christian Bauer, Calvin Berggren, Nicholas Dunn, Andrew Hornig, Frank Tackmann, Jesse Thaler, Christopher Vermilion, Jonathan Walsh, SZ Outline
Jürgen R. Reuter, DESY. J.R.Reuter QCD NLO/Top Threshold in WHIZARD Radcor/Loopfest 2015, UCLA,
QCD NLO with Powheg Matching and Top Threshold Matching in WHIZARD Jürgen R. Reuter, DESY in collaboration with F. Bach, B. Chokoufé, A. Hoang, W. Kilian, M. Stahlhofen, C. Weiss Outline of the talk 1)
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
Superleading logarithms in QCD
Superleading logarithms in QCD Soft gluons in QCD: an introduction. Gaps between jets I: the old way (
NLO / Loop Induced. check that everything is Compare for your BSM model
NLO / Loop Induced check that everything is working @NLO p p > mu+ mu- [QCD] p p > t t~ [QCD] Compare for your BSM model p p > uv uv~ @LO and @NLO perform the decay of uv uv~ with full spin correlation
VV + JETS AND THE POWHEG BOX
VV + JETS AND THE POWHEG BOX Carlo Oleari Università di Milano-Bicocca, Milan Multi-Boson Interactions 2016, Madison 24 August 2016 The latest VV + jets fixed-order results Vector-boson production in the
Exclusive Event Generation for the t t Threshold and the Transition to the Continuum
Exclusive Event Generation for the t t Threshold and the Transition to the Continuum Wolfgang Kilian University of Siegen QWG 2017, Peking University November 2017 F. Bach, B. Chokoufé Nejad, A.H. Hoang,
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
A color matrix element corrected parton shower and multiplet color bases
A color matrix element corrected parton shower and multiplet color bases First results from an SU(3), rather than SU( ) parton shower In collaboration with Simon Plätzer (DESY), arxiv:20.0260 ColorFull
Diphoton production at LHC
1 Diphoton production at LHC 120 GeV < M γγ < 140 GeV Leandro Cieri Universidad de Buenos Aires - Argentina & INFN Sezione di Firenze Rencontres de Moriond March 11, 2012 Outline Introduction Available
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
Matching and merging Matrix Elements with Parton Showers II
Tree-level ME vs PS CKKW CKKW-L Matching and merging Matri Elements with Parton Showers II Leif Lönnblad Department of Theoretical Physics Lund University MCnet/CTEQ Summer School Debrecen 08.08.15 Matching
Higher order QCD corrections to the Drell-Yan process
Higher order QCD corrections to the Drell-Yan process Massimiliano Grazzini (INFN, Firenze) Milano, march 18, 2009 Outline Introduction NLL+LO resummation NNLO calculation Summary & Outlook Introduction
Jet Matching at Hadron Colliders. Johan Alwall National Taiwan University
Jet Matching at Hadron Colliders Johan Alwall National Taiwan University IPMU Focus week, Tokyo, Japan, 12 Nov 2009 Why jet matching? Many (all) interesting New Physics signals at hadron colliders include
Search for tt(h bb) using the ATLAS detector at 8 TeV
Search for tt(h bb) using the ATLAS detector at 8 TeV on behalf of the ATLAS Collaboration University of Göttingen Motivation, Strategy & Introduction Overview: tt(h bb) leptonic analysis Summary & Outlook
Precision calculations for collider processes Gudrun Heinrich Max Planck Institute for Physics, Munich
Precision calculations for collider processes Gudrun Heinrich Max Planck Institute for Physics, Munich Scientific Board Meeting July 27, 2016 Overview tools FeynArts/FormCalc, Cuba GoSam SecDec NLO phenomenology
arxiv: v1 [hep-ph] 12 Dec 2015
![arxiv: v1 [hep-ph] 12 Dec 2015](/thumbs/88/116125005.jpg "arxiv: v1 [hep-ph] 12 Dec 2015")
EPJ Web of Conferences will be set by the publisher DOI: will be set by the publisher c Owned by the authors, published by EDP Sciences, 208 arxiv:52.03974v [hep-ph] 2 Dec 205 Recent developments in Monte-Carlo
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
W/Z inclusive measurements in ATLAS
/Z inclusive measurements in J-B. Blanchard On behalf of the Atlas collaboration Standard Model @ LHC 1-1/4/1 Introduction /Z physics at the LHC LHC: a /Z factory... heoretically well understood bosons,
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
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
Precision Monte Carlo
Frank Krauss Institute for Particle Physics Phenomenology Durham University CTEQ School, Pittsburgh, 205 INTRODUCTION Improving event generators The inner working of event generators... simulation: divide
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
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
Sherpa, Event Generator for the LHC. Stefan Höche Dresden University of Technology
Sherpa, Event Generator for the LHC Stefan Höche Dresden University of Technology Outline Introduction Matrix Elements in Sherpa Merging ME s with the Parton Shower Simulation results vs. Data Conclusion
SM/BSM physics with GoSam
Physik-Institut SM/BSM physics with GoSam Nicolas Greiner On behalf of the GoSam collaboration Monte Carlo Tools for Physics Beyond the Standard Model -- 20-24.7.2016 Beijing Outline q Very brief introduction
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
Double Parton Scattering in CMS. Deniz SUNAR CERCI Adiyaman University On behalf of the CMS Collaboration Low-x th June 2017 Bari, Italy
Double Parton Scattering in CMS Deniz SUNAR CERCI Adiyaman University On behalf of the CMS Collaboration Low-x 2017 17th June 2017 Bari, Italy Outline Introduction to DPS DPS measurements with CMS 2b +
Non-perturbative effects in transverse momentum distribution of electroweak bosons
Non-perturbative effects in transverse momentum distribution of electroweak bosons Andrzej Siódmok a,e in collaboration with M. H. Seymour b,c & S. Gieseke b,d a Jagiellonian University, b CERN, c University
W/Z production with 2b at NLO
W/Z production with b at NLO Laura Reina Eugene, September 9 Motivations: main background to W H/ZH associated production; single-top production; H/A + b b and other signals of new physics; t t production;
Physics with Four Leptons in the ATLAS experiment
Physics with Four Leptons in the ATLAS experiment Yusheng Wu ( 吴雨生 ) University of Science and Technology of China On behalf of ATLAS Collaboration CLHCP, Nanjing University, Dec. 22-24, 2017 Facts about
Summary of precision QCD issues at FCC-ee
Summary of precision QCD issues at FCC-ee th 11 FCC-ee workshop: Theory & Experiments th CERN, 11 Jan. 2019 David d'enterria CERN 1/25 Precision QCD & FCC-ee physics FCC-ee uniquely small EXP uncertainties
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
Top-quark mass determination
Trento, 13.Sept. 2017 LFC17: Old and New Strong Interaction from LHC to Future colliders Top-quark mass determination Peter Uwer Outline 1. Motivation 2. Some preliminaries 3. Overview of existing methods
12 March 2014 Liverpool High Energy Theory Group
ELECTROWEA HIGGS BOSON PRODUCTION IN ASSOCIATION WITH THREE JETS (A..A. VBF + JET) AT QCD IN COLLABORATION WITH S. PLATZER, F. CAMPANERIO, AND M. SJODAHL! PRL, 2802, (203), ARXIV:3.5455! Dr. Terrance Figy
Progress in the MC simulation of jets and jet quenching. Abhijit Majumder Wayne State University
Progress in the MC simulation of jets and jet quenching Abhijit Majumder Wayne State University 5th JET collaboration meeting, UC Davis, June 17-18, 2013 Outline 1) Outline of project plan 2) Concise description
General-purpose event generators Issues Survey. Improving precision & modelling Matching ME & PS UE & intrinsic pt PDFs for MC Conclusions?
MC Theory Overview General-purpose event generators Issues Survey, University of Cambridge MC4BSM-3, CERN 10-11 March 2008 Improving precision & modelling Matching ME & PS UE & intrinsic pt PDFs for MC
Constraints on Higgs-boson width using H*(125) VV events
Constraints on Higgs-boson width using H*(125) VV events Roberto Covarelli ( University / INFN of Torino ) on behalf of the CMS and ATLAS collaborations 25th International Workshop on Weak Interactions
Higgs + Multi-jets in Gluon Fusion
Higgs + Multi-jets in Gluon Fusion Nicolas Greiner DESY In collaboration with S.Hoeche, G.Luisoni, M.Schoenherr, J.Winter, V. Yundin arxiv:1506.01016 Higher order corrections in Higgs physics > Higher
W + W Production with Many Jets at the LHC
W + W Production with Many Jets at the LHC NLO QCD with BlackHat+Sherpa Fernando Febres Cordero Department of Physics, University of Freiburg Radcor-Loopfest 2015, UCLA June 2015 With Philipp Hofmann and
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
Higgs + Jet angular and p T distributions : MSSM versus SM
Higgs + Jet angular and p T distributions : MSSM versus SM Oliver Brein ( Institute for Particle Physics Phenomenology, Durham, UK ) in collaboration with Wolfgang Hollik e-mail: oliver.brein@durham.ac.uk
New results for parton showers
New results for parton showers Gavin P. Salam* Rudolf Peierls Centre for Theoretical Physics & All Souls College, Oxford including work with M. Dasgupta, F. Dreyer, K. Hamilton, P. Monni * on leave from
Summary and Outlook. Davison E. Soper University of Oregon. LoopFest V, June 2006
Summary and Outlook Davison E. Soper University of Oregon LoopFest V, June 2006 Parton Showers & jet matching R. Erbacher emphasized how important this issue is for CDF analyses. CDF has been using a somewhat
arxiv: v1 [hep-ex] 24 Oct 2017
![arxiv: v1 [hep-ex] 24 Oct 2017](/thumbs/96/128296086.jpg "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
The event Generator. Chris/an Bauer. Lawrence Berkeley Na/onal Laboratory. Theorie Palaver, Mainz April
The event Generator Chris/an Bauer Lawrence Berkeley Na/onal Laboratory Theorie Palaver, Mainz April 23 2012 The GENEVA Collaboration: Simone Alioli, CWB, Calvin Berggren, Andrew Hornig, Frank Tackmann,
Hard 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
DIS 2004 Theory Highlights
DIS 2004 Theory Highlights Anna Staśto DESY Hamburg & IFJ PAN Kraków DIS 2004 Theory Highlights p.1/32 Overview DIS2004, Strbskie Pleso, Slovakia, 14-18 April 2004. Six working groups: Structure functions,
Parton Showers. Stefan Gieseke. Institut für Theoretische Physik KIT. Event Generators and Resummation, 29 May 1 Jun 2012
Parton Showers Stefan Gieseke Institut für Theoretische Physik KIT Event Generators and Resummation, 29 May Jun 202 Stefan Gieseke PSR 202 DESY Hamburg 29/5-/6/202 /45 Parton showers Quarks and gluons
Jet reconstruction in W + jets events at the LHC
Jet reconstruction in W + jets events at the LHC Ulrike Schnoor Michigan State University High Energy Physics Institutsseminar IKTP TU Dresden, Nov 4, 010 Jet reconstruction in W + jets events at the LHC
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
Matching and Merging
Matching and Merging Emanuele Re LAPTh Annecy MC4BSM 2016, UCAS, Beijing, 20 July 2016 Introduction 1 / 33 this talk is about methods aiming at improving the accuracy of LO Monte Carlo event generators:
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
Vector boson + jets at NLO vs. LHC data
Vector boson + jets at NLO vs. LHC data Lance Dixon (SLAC) for the BlackHat collaboration Z. Bern, LD, G. Diana, F. Febres Cordero, S. Höche, H. Ita, D. Kosower, D. Maître, K. Ozeren LHC Theory Workshop
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
Precision Physics at the LHC
Precision Physics at the LHC V. Ravindran The Institute of Mathematical Sciences, Chennai, India IMHEP-2019, IOP, Bhubaneswar, 17-22 Jan 2019 Precision Physics Plan Why Precision Calculation (PC) Impact
Towards Jet Cross Sections at NNLO
Towards Jet Cross Sections at HP.4, September, MPI Munich Expectations at LHC Large production rates for Standard Model processes single jet inclusive and differential di-jet cross section will be measured
Study of observables for measurement of MPI using Z+jets process
Study of observables for measurement of MPI using Z+jets process PANJAB University, IN Email: ramandeep.kumar@cern.ch AKAL University, IN 7th International Workshop on Multiple Parton Interactions at the
Comparisons of Predictions from Exact Amplitude-Based Resummation Methods with LHC and Cosmological Data
Comparisons of Predictions from Exact Amplitude-Based Resummation Methods with LHC and Cosmological Data BFL Ward Baylor University 09/27/2013 RADCOR 2013 w S. Majhi, A. Mukhopadhyay, S. Yost 9/26/2013
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
Theoretical Particle Physics in Lund
Theoretical Particle Physics in Lund QCD phenomenology Event generators: Gösta Gustafson, Torbjörn Sjöstrand, Leif Lönnblad, Malin Sjödahl, Stefan Prestel, Jesper Roy Christiansen, Christian Bierlich Diffraction,
New physics at colliders A tools vision
New physics at colliders A tools vision Fuks Benjamin LPTHE / UPMC Tools 2017: Tools for the SM and the New Physics @ Corfu, Greece September 9-14, 2017 1 Outline 1. New physics & Monte Carlo simulations