arXiv : Accurate simulation of W, Z and Higgs boson decays in Sherpa

Krauss, Frank; Schönherr, Marek; Linten, Robin; Lindert, Jonas M.

doi:10.1140/epjc/s10052-019-6614-x

Article
Report number	arXiv:1809.10650 ; IPPP-18-88 ; CERN-TH-2018-212 ; MCnet-18-26 ; IPPP--18--88,CERN-TH-2018-212,MCnet-18-26
Title	Accurate simulation of W, Z and Higgs boson decays in Sherpa
Author(s)	Krauss, Frank (Durham U., IPPP) ; Lindert, Jonas M. (Durham U., IPPP) ; Linten, Robin (Durham U., IPPP) ; Schönherr, Marek (CERN)
Publication	2019-02-19
Imprint	2018-09-27
Number of pages	35
Note	35 pages, 8 figures
In:	Eur. Phys. J. C 79 (2019) 143
DOI	10.1140/epjc/s10052-019-6614-x
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	We discuss the inclusion of next-to-next-to leading order electromagnetic and of next-to leading order electroweak corrections to the leptonic decays of weak gauge and Higgs bosons in the SHERPA event generator. To this end, we modify the Yennie-Frautschi-Suura scheme for the resummation of soft photon corrections and its systematic improvement with fixed-order calculations, to also include the effect of virtual corrections due to the exchange of weak gauge bosons. We detail relevant technical aspects of our implementation and present numerical results for observables relevant for high-precision Drell-Yan and Higgs boson production and decay simulations at the LHC.
Copyright/License	publication: (License: CC-BY-4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

$Plots of the sum of the photon energies in the decay rest frame, $\sum_{n_{\gamma}} E_{\gamma}$, on the left and the number of photons with $E_{\gamma} > 0.1 \GeV$, $n_{\gamma}$, on the right. Predictions and labels as in Fig.~\ref{fig:results:W:mTlnu_mlg}.$ $Plots of the invariant mass of the two decay leptons, $m_{\ell\ell}$, on the left and the transverse momentum of the system of the two leptons, $p_{\perp,\ell\ell}$, on the right in the process $pp\to H \to \ell^+\ell^-$. Nominal predictions are shown for $pp \to H\to \mu^+ \mu^-$ at LO, in soft-collinear NLO approximation, at NLO QED and at NNLO QED $\oplus$ NLO EW. The ratio plots highlight the effect of the considered higher-order corrections and lepton identity. See text for details.$ $Transverse mass of the lepton-neutrino system $M^{\perp}_{\ell\nu}$ (left) and the invariant mass of the system of the charged lepton and the nearest photon, $m_{\ell\gamma}$ (right) in $pp \to W^+ \to \ell^+ \nu_\ell$. Nominal predictions are shown for $pp \to W^+\to e^+ v_e$ at LO, in soft-collinear NLO approximation and at NLO EW, where electrons are always dressed with collinear photons within $\Delta R=0.1$. The ratio plots highlight the effect of the considered higher-order corrections and the effect due to different photon dressing or lepton identity. See text for details.$ Show more plots

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