TY - JOUR
T1 - Precise predictions for same-sign W-boson scattering at the LHC
AU - Ballestrero, Alessandro
AU - Biedermann, Benedikt
AU - Brass, Simon
AU - Denner, Ansgar
AU - Dittmaier, Stefan
AU - Frederix, Rikkert
AU - Govoni, Pietro
AU - Grossi, Michele
AU - Jäger, Barbara
AU - Karlberg, Alexander
AU - Maina, Ezio
AU - Pellen, Mathieu
AU - Pelliccioli, Giovanni
AU - Plätzer, Simon
AU - Rauch, Michael
AU - Rebuzzi, Daniela
AU - Reuter, Jürgen
AU - Rothe, Vincent
AU - Schwan, Christopher
AU - Shao, Hua Sheng
AU - Stienemeier, Pascal
AU - Zanderighi, Giulia
AU - Zaro, Marco
AU - Zeppenfeld, Dieter
N1 - Publisher Copyright:
© 2018, The Author(s).
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various approximations that are usually performed for this kind of process against the complete calculation, at LO and NLO QCD accuracy. Such a study is performed both in the usual fiducial region used by experimental collaborations and in a more inclusive phase space, where the differences among the various approximations lead to more sizeable effects. Afterwards, we turn to predictions matched to parton showers, at LO and NLO: we show that on the one hand, the inclusion of NLO QCD corrections leads to more stable predictions, but on the other hand the details of the matching and of the parton-shower programs cause differences which are considerably larger than those observed at fixed order, even in the experimental fiducial region. We conclude with recommendations for experimental studies of vector-boson scattering processes.
AB - Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various approximations that are usually performed for this kind of process against the complete calculation, at LO and NLO QCD accuracy. Such a study is performed both in the usual fiducial region used by experimental collaborations and in a more inclusive phase space, where the differences among the various approximations lead to more sizeable effects. Afterwards, we turn to predictions matched to parton showers, at LO and NLO: we show that on the one hand, the inclusion of NLO QCD corrections leads to more stable predictions, but on the other hand the details of the matching and of the parton-shower programs cause differences which are considerably larger than those observed at fixed order, even in the experimental fiducial region. We conclude with recommendations for experimental studies of vector-boson scattering processes.
UR - http://www.scopus.com/inward/record.url?scp=85052225524&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-018-6136-y
DO - 10.1140/epjc/s10052-018-6136-y
M3 - Article
AN - SCOPUS:85052225524
SN - 1434-6044
VL - 78
JO - European Physical Journal C
JF - European Physical Journal C
IS - 8
M1 - 671
ER -