Hadroproduction of W+ W− bb at NLO accuracymatched with shower Monte Carlo programs

Garzelli, Maria Vittoria and Kardos, Ádám and Trócsányi, Zoltán (2014) Hadroproduction of W+ W− bb at NLO accuracymatched with shower Monte Carlo programs. JOURNAL OF HIGH ENERGY PHYSICS (8). ISSN 1126-6708

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Abstract

We present the computation of the differential cross section for the pro-cess p p(¯p) → (W+ W− b ¯b →) e+ νe μ− ¯νμ b ¯b + X at NLO QCD accuracy matched toShower Monte Carlo (SMC) simulations using PowHel, on the basis of the interface be-tween HELAC-NLO and POWHEG-BOX. We include all resonant and non-resonant contribu-tions. This is achieved by fully taking into account the effect of off-shell t-quarks andoff-shell W-bosons in the complex mass scheme. We also present a program called DECAYERthat can be used to let the t-quarks present in the event files for p p(¯p) → t ¯t X processesdecay including both the finite width of the t-quarks and spin correlations. We presentpredictions for both the Tevatron and the LHC, with emphasis on differences emergingfrom three different W+ W− b ¯b hadroproduction computations: (i) full implementation ofthe p p(¯p) → W+ W− b ¯b process, (ii) generating on-shell t-quarks pushed off-shell with aBreit-Wigner finite width and decayed by Decayer, and (iii) on-shell t-quark productionfollowed by decay in the narrow width approximation, as described by the SMC.

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