Hadroproduction of $W^+ W^- b \bar{b}$ at NLO accuracy matched with shower Monte Carlo programs

M. V. Garzelli; A. Kardos; Z. Trocsanyi

doi:10.1007/JHEP08(2014)069

paper

Hadroproduction of $W^{+} W^{-} b b ˉ$ at NLO accuracy matched with shower Monte Carlo programs

arXiv:1405.5859 · doi:10.1007/JHEP08(2014)069

Abstract

We present the computation of the differential cross section for the process $pp (p ˉ) \to (W^{+} W^{-} b b ˉ \to) e^{+} ν_{e} μ^{-} ν ˉ_{μ} b b ˉ + X$ at NLO QCD accuracy matched to Shower Monte Carlo (SMC) simulations using PowHel, on the basis of the interface between HELAC-NLO and POWHEG-BOX. We include all resonant and non-resonant contributions. This is achieved by fully taking into account the effect of off-shell t-quarks and off-shell W-bosons in the complex mass scheme. We also present a program called DECAYER that can be used to let the t-quarks present in the event files for $pp (p ˉ) \to t t ˉ X$ processes decay including both the finite width of the t-quarks and spin correlations. We present predictions for both the Tevatron and the LHC, with emphasis on differences emerging from three different $W^{+} W^{-} b b ˉ$ hadroproduction computations: (i) full implementation of the $p p (p ˉ) \to W^{+} W^{-} b b ˉ$ process, (ii) generating on-shell t-quarks pushed off-shell with a Breit-Wigner finite width and decayed by DECAYER, and (iii) on-shell t-quark production followed by decay in the narrow width approximation, as described by the SMC.

arXiv comment40 pages, 26 figures; slightly expanded version matching the one published in JHEP

Hadroproduction of $W^{+} W^{-} b b ˉ$ at NLO accuracy matched with shower Monte Carlo programs

Abstract

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Cited by in corpus (6)

Hadroproduction of $W^{+} W^{-} b b ˉ$ at NLO accuracy matched with shower Monte Carlo programs