A study of a NLO matrix element generator for Wγ and matching scheme for NLO events and Pythia
نویسندگان
چکیده
We present here a study of event generators for the hadronic production of Wγ . We compare a NLO Wγ matrix element generator with the leading order calculation in Pythia . A matching scheme between a next-to-leading order Wγ matrix element generator by Baur et. al. and the Pythia parton shower is presented. The NLO package produces Wγ +0 jet and Wγ +1jet final states in the hard scattering and the objective is to consistently match these to the initial state radiation from Pythia parton shower. The proposed methodology preserves both the rate of the hard scattering process as well as various kinematic distributions of experimental interest. ∗An abbreviated version to appear in the proceedings of Physics at TeV Colliders, Les Houches 8-26 June 2009 †Work was supported by the European Union Marie Curie Research Training Network MCnet, under contract MRTN-CT-2006-035606 ar X iv :1 00 2. 42 96 v1 [ he pph ] 2 3 Fe b 20 10
منابع مشابه
MC@NLO for Heavy Quarks in Photoproduction
MC@NLO [2, 3] is a generator for calculating next-to-leading order matrix elements, combined with a Monte Carlo event generator. When constructing an MC@NLO one needs to match the NLO matrix element with the parton shower of the generator. If wrongfully done, some of the configurations produced by the real gluon emissions in the matrix element may also be produced by the first branching in the ...
متن کاملInitial-state parton shower kinematics for NLO event generators
We are developing a consistent method to combine tree-level event generators for hadron collision interactions with those including one additional QCD radiation from the initial-state partons, based on the limited leading-log (LLL) subtraction method, aiming at an application to NLO event generators. In this method, a boundary between non-radiative and radiative processes necessarily appears at...
متن کاملMC@NLO for the hadronic decay of Higgs bosons in associated production with vector bosons
In this article we describe simulations of the hadronic decay of Higgs bosons produced in association with vector bosons at linear and hadronic colliders. We use the Monte Carlo at next-to-leading-order (MC@NLO) matching prescription with the Herwig++ event generator to predict various spectra of the resulting bb̄ pairs and compare our results with leading order and matrix element correction pre...
متن کاملStandard Model Higgs cross sections (NLO) and PYTHIA
Recent NLO results of the SM Higgs cross section at the LHC differ by factors of up to 2 from the LO cross section estimates currently used inside PYTHIA. We propose a scheme on how these NLO results can be used consistently inside the PYTHIA Monte Carlo simulations. Numerical results for Higgs are given for three recent parton distribution functions, MRS(R1), GRV(94)HO and CTEQ4M. For complete...
متن کاملar X iv : h ep - p h / 02 06 25 4 v 1 2 5 Ju n 20 02 Soft and hard QCD in charmonium production
Hard and soft QCD dynamics are both important in charmonium hadroproduction, as presented here through a next-to-leading order QCD matrix element calculation combined with the colour evaporation model. Observed x F and p ⊥ distributions of J/ψ in hadroproduction are reproduced. Quite similar results can also be obtained with a Monte Carlo event generator where c ¯ c pairs are instead produced t...
متن کامل