Abstract
We present results for the QCD production of Z/γ + 2 jets matched with parton showers using the POWHEG method. Some technicalities relevant for the merging of NLO corrections for this process with parton showers are discussed, and results for typical distributions are shown, in presence of different sets of cuts. A comparison with ATLAS data is also presented, and good agreement is found.
Similar content being viewed by others
References
Z. Bern et al., Driving missing data at next-to-leading order, Phys.Rev. D 84 (2011) 114002 [arXiv:1106.1423] [INSPIRE].
D.L. Rainwater, D. Zeppenfeld and K. Hagiwara, Searching for H → τ + τ − in weak boson fusion at the CERN LHC, Phys. Rev. D 59 (1998) 014037 [hep-ph/9808468] [INSPIRE].
T. Plehn, D.L. Rainwater and D. Zeppenfeld, A method for identifying H →τ + τ − →e ± μ ∓ p T at the CERN LHC, Phys. Rev. D 61(2000) 093005 [hep-ph/9911385] [INSPIRE].
J.M. Campbell and R.K. Ellis, Next-to-leading order corrections to W + 2 jet and Z + 2 jet production at hadron colliders, Phys. Rev. D 65 (2002) 113007 [hep-ph/0202176] [INSPIRE].
J.M. Campbell, R.K. Ellis and D.L. Rainwater, Next-to-leading order QCD predictions for W +2 jet and Z+2 jet production at the CERN LHC, Phys. Rev. D 68 (2003) 094021 [hep-ph/0308195] [INSPIRE].
C. Oleari and D. Zeppenfeld, QCD corrections to electroweak ν(ℓ)jj and ℓ + ℓ − jj production, Phys. Rev. D 69 (2004) 093004 [hep-ph/0310156] [INSPIRE].
S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 06 (2002) 029 [hep-ph/0204244] [INSPIRE].
S. Frixione, P. Nason and B.R. Webber, Matching NLO QCD and parton showers in heavy flavor production, JHEP 08 (2003) 007 [hep-ph/0305252] [INSPIRE].
P. Nason, A New method for combining NLO QCD with shower Monte Carlo algorithms, JHEP 11 (2004) 040 [hep-ph/0409146] [INSPIRE].
S. Frixione, P. Nason and C. Oleari, Matching NLO QCD computations with parton shower simulations: the POWHEG method, JHEP 11 (2007) 070 [arXiv:0709.2092] [INSPIRE].
S. Alioli, P. Nason, C. Oleari and E. Re, Vector boson plus one jet production in POWHEG, JHEP 01 (2011) 095 [arXiv:1009.5594] [INSPIRE].
S. Alioli, K. Hamilton, P. Nason, C. Oleari and E. Re, Jet pair production in POWHEG, JHEP 04 (2011) 081 [arXiv:1012.3380] [INSPIRE].
A. Kardos, C. Papadopoulos and Z. Trócsányi, Top quark pair production in association with a jet with NLO parton showering, Phys. Lett. B 705 (2011) 76 [arXiv:1101.2672] [INSPIRE].
S. Alioli, S.-O. Moch and P. Uwer, Hadronic top-quark pair-production with one jet and parton showering, JHEP 01 (2012) 137 [arXiv:1110.5251] [INSPIRE].
L. D’Errico and P. Richardson, Next-to-leading-order Monte Carlo simulation of diphoton production in hadronic collisions, JHEP 02 (2012) 130 [arXiv:1106.3939] [INSPIRE].
S. Hoeche, F. Krauss, M. Schonherr and F. Siegert, A critical appraisal of NLO + PS matching methods, JHEP 09 (2012) 049 [arXiv:1111.1220] [INSPIRE].
R. Frederix et al., aMC@NLO predictions for Wjj production at the Tevatron, JHEP 02 (2012) 048 [arXiv:1110.5502] [INSPIRE].
S. Hoeche, F. Krauss, M. Schonherr and F. Siegert, W + n-jet predictions with MC@NLO in Sherpa, arXiv:1201.5882 [INSPIRE].
J.M. Campbell et al., NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM, JHEP 07 (2012) 092 [arXiv:1202.5475] [INSPIRE].
S. Alioli, P. Nason, C. Oleari and E. Re, A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX, JHEP 06 (2010) 043 [arXiv:1002.2581] [INSPIRE].
K. Hagiwara and D. Zeppenfeld, Helicity amplitudes for heavy lepton production in e + e − annihilation, Nucl. Phys. B 274 (1986) 1 [INSPIRE].
K. Hagiwara and D. Zeppenfeld, Amplitudes for multiparton processes involving a current at e + e − , e ± p and hadron colliders, Nucl. Phys. B 313 (1989) 560 [INSPIRE].
J. Alwall et al., MadGraph/MadEvent v4: the new web generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [INSPIRE].
Z. Bern, L.J. Dixon and D.A. Kosower, One loop amplitudes for e + e − to four partons, Nucl. Phys. B 513 (1998) 3 [hep-ph/9708239] [INSPIRE].
C. Berger et al., An automated implementation of on-shell methods for one-loop amplitudes, Phys. Rev. D 78 (2008) 036003 [arXiv:0803.4180] [INSPIRE].
T. Binoth et al., A proposal for a standard interface between Monte Carlo tools and one-loop programs, Comput. Phys. Commun. 181 (2010) 1612 [arXiv:1001.1307] [INSPIRE].
T. Gleisberg et al., Event generation with SHERPA 1.1, JHEP 02 (2009) 007 [arXiv:0811.4622] [INSPIRE].
F. Krauss, R. Kuhn and G. Soff, AMEGIC++ 1.0: a matrix element generator in C++, JHEP 02 (2002) 044 [hep-ph/0109036] [INSPIRE].
J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
D.L. Rainwater, R. Szalapski and D. Zeppenfeld, Probing color singlet exchange in Z + two jet events at the CERN LHC, Phys. Rev. D 54 (1996) 6680 [hep-ph/9605444] [INSPIRE].
P. Nason and C. Oleari, NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG, JHEP 02 (2010) 037 [arXiv:0911.5299] [INSPIRE].
T. Plehn, D.L. Rainwater and D. Zeppenfeld, Determining the structure of Higgs couplings at the LHC, Phys. Rev. Lett. 88 (2002) 051801 [hep-ph/0105325] [INSPIRE].
ATLAS collaboration, G. Aad et al., Measurement of the production cross section for Z/γ * in association with jets in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Rev. D 85 (2012) 032009 [arXiv:1111.2690] [INSPIRE].
L. D’Errico and P. Richardson, A positive-weight next-to-leading-order Monte Carlo simulation of deep inelastic scattering and Higgs boson production via vector boson fusion in HERWIG++, arXiv:1106.2983 [INSPIRE].
S. Frixione, P. Nason and G. Ridolfi, A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction, JHEP 09 (2007) 126 [arXiv:0707.3088] [INSPIRE].
S. Alioli, K. Hamilton and E. Re, Practical improvements and merging of POWHEG simulations for vector boson production, JHEP 09 (2011) 104 [arXiv:1108.0909] [INSPIRE].
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1204.5433
Rights and permissions
About this article
Cite this article
Re, E. NLO corrections merged with parton showers for Z + 2 jets production using the POWHEG method. J. High Energ. Phys. 2012, 31 (2012). https://doi.org/10.1007/JHEP10(2012)031
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP10(2012)031