Jet pair production in POWHEG

We present an implementation of the next-to-leading order dijet production process in hadronic collisions in the framework of POWHEG, which is a method to implement NLO calculations within a shower Monte Carlo context. In constructing the simulation, we have made use of the POWHEG BOX toolkit, which makes light of many of the most technical steps. The majority of this article is concerned with the study of the predictions of the Monte Carlo simulation. In so doing, we validate our program for use in experimental analyses, elaborating on some of the more subtle features which arise from the interplay of the NLO and resummed components of the calculation. We conclude our presentation by comparing predictions from the simulation against a number of Tevatron and LHC jet-production results.

[1]  S. Frixione,et al.  Matching NLO QCD computations and parton shower simulations , 2002, hep-ph/0204244.

[2]  Mrinal Dasgupta,et al.  Dijet rates with symmetric E t cuts. , 2004 .

[3]  U. Davis.  Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector , 2011 .

[4]  F. Siegert,et al.  Automating the Powheg method in Sherpa , 2010, 1008.5399.

[5]  L. Suter,et al.  Herwig++ 2.5 Release Note , 2002, 1102.1672.

[6]  G. Salam,et al.  A Practical Seedless Infrared Safe Cone Algorithm a , 2007, 0705.2696.

[7]  J. Adelman,et al.  Measurement of the inclusive jet cross section using the k{sub T} algorithm in pp collisions at â(s)=1.96 TeV with the CDF II detector , 2007 .

[8]  Z. Kunszt,et al.  Three-jet cross sections to next-to-leading order , 1995, hep-ph/9512328.

[9]  J. Kanzaki,et al.  Generic User Process Interface for Event Generators , 2001 .

[10]  E. Re,et al.  Vector boson plus one jet production in POWHEG , 2010, 1009.5594.

[11]  D. Soper,et al.  Calculation of jet cross sections in hadron collisions at order alpha s3. , 1992, Physical review. D, Particles and fields.

[12]  S. Frixione.  A general approach to jet cross sections in QCD , 1997, hep-ph/9706545.

[13]  M. Seymour,et al.  Longitudinally-invariant k ⊥ -clustering algorithms for hadron-hadron collisions , 1993 .

[14]  Bamberger,et al.  Evidence for Color Coherence inpF Collisions at 4s = 1.8 TeV , 1998 .

[15]  E. Re,et al.  A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX , 2010, 1002.2581.

[16]  S. D. Ellis,et al.  Run II jet physics , 2000 .

[17]  P. Nason,et al.  Matching NLO QCD computations with Parton Shower simulations: the POWHEG method , 2007, 0709.2092.

[18]  Ellis,et al.  Successive combination jet algorithm for hadron collisions. , 1993, Physical review. D, Particles and fields.

[19]  E. al.,et al.  Measurement of the inclusive jet cross section at the Fermilab Tevatron pp collider using a cone-based jet algorithm , 2008, 0807.2204.

[20]  J. Sexton,et al.  QCD radiative corrections to parton-parton scattering , 1986 .

[21]  Search for dijet resonances in 7 TeV pp collisions at CMS , 2010 .

[22]  G. Kramer,et al.  Dijet cross sections in photon-proton collisions , 1996 .

[23]  R. Ellis,et al.  Soft radiation in parton-parton scattering☆ , 1987 .

[24]  I. Hinchliffe,et al.  EXCITED QUARK PRODUCTION AT HADRON COLLIDERS , 1987 .

[25]  Peter Richardson,et al.  A positive-weight Next-to-Leading Order Monte Carlo simulation for Higgs boson production , 2009, 0903.4345.

[26]  G. Salam,et al.  Giant QCD K-factors beyond NLO , 2010, 1006.2144.

[27]  M. Cacciari,et al.  Dispelling the N3 myth for the kt jet-finder , 2005, hep-ph/0512210.

[28]  M. Peskin,et al.  TeV strings and collider probes of large extra dimensions , 2000, hep-ph/0001166.

[29]  S. Moretti,et al.  HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes) , 2001 .

[30]  J. Huston,et al.  New generation of parton distributions with uncertainties from global QCD analysis , 2002, hep-ph/0201195.

[31]  G. Hooft.  A Planar Diagram Theory for Strong Interactions , 1974 .

[32]  B. R. Webber,et al.  Preprint typeset in JHEP style.- PAPER VERSION Cavendish–HEP–05/09 , 2005 .

[33]  G.Corcella,et al.  HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes) , 2000, hep-ph/0011363.

[34]  M. Cacciari,et al.  The anti-$k_t$ jet clustering algorithm , 2008, 0802.1189.

[35]  A. Bocci,et al.  Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector , 2010, 1009.5908.

[36]  H Severini,et al.  Measurement of Dijet Azimuthal Decorrelations at Central Rapidities in p̄p Collisions at √ s = 1 . 96 TeV , 2004 .

[37]  E. Re,et al.  NLO Higgs boson production via gluon fusion matched with shower in POWHEG , 2008, 0812.0578.

[38]  B. Webber,et al.  Monte Carlo simulation of general hard processes with coherent QCD radiation , 1988 .

[39]  M. Gigg,et al.  Herwig++ physics and manual , 2008, 0803.0883.

[40]  P. Nason.  A new method for combining NLO QCD with shower Monte Carlo algorithms , 2004, hep-ph/0409146.

[41]  P. Nason.  MINT: a Computer Program for Adaptive Monte Carlo Integration and Generation of Unweighted Distributions , 2007, 0709.2085.

[42]  S. Mrenna,et al.  Pythia 6.3 physics and manual , 2003, hep-ph/0308153.

[43]  P. Bartalini,et al.  A standard format for Les Houches Event Files , 2007, Comput. Phys. Commun..

[44]  T. Sjostrand,et al.  Multiple interactions and the structure of beam remnants , 2004 .

[45]  M. Albrow,et al.  Evidence for color coherence in [ital p[bar p]] collisions at [radical][ital s] =1. 8 TeV , 1994 .

[46]  G. Ridolfi,et al.  Jet photoproduction at HERA , 1997 .

[47]  Peter Richardson,et al.  A Positive-Weight Next-to-Leading Order Monte Carlo Simulation of Drell-Yan Vector Boson Production , 2008, 0806.0290.

[48]  Krutelyov,et al.  Measurement of the inclusive jet cross section using the k(T) algorithm in p(p)over-bar collisions at root s=1.96 TeV with the CDF II detector , 2007 .