NLO effects in EFT fits to W+W− production at the LHC

Abstract

We study the impact of anomalous gauge boson and fermion couplings on the production of W + W − pairs at potential future LHC upgrades and estimate the sensitivity at √ S = 14 TeV with 3 ab −1 and √ S = 27 TeV with 15 ab −1 . A general technique for including NLO QCD effects in effective field theory (EFT) fits to kinematic distributions is presented, and numerical results are given for √ S = 13 TeV W + W − production. Our method allows fits to anomalous couplings at NLO accuracy in any EFT basis and has been implemented in a publicly available version of the POWHEG-BOX. Analytic expressions for the K-factors relevant for 13 TeV total cross sections are given for the HISZ and Warsaw EFT bases and differential K-factors can be obtained using the supplemental material. Our study demonstrates the necessity of including anomalous Zfermion couplings in the extraction of limits on anomalous 3-gauge-boson couplings.

Electroweak and QCD corrections to Z and W pole observables in the standard model EFT

“…A program of calculations has begun to treat the SMEFT contributions at NLO, for both the QCD and electroweak (EW) contributions. The SMEFT QCD corrections to gauge boson pair production [11,12] and top quark production and decay [13][14][15][16] are known. The electroweak SMEFT corrections to Higgs decays to bb [17][18][19], γγ [20][21][22][23], Zγ [24,25], ZZ [24], and W W [20] have also been computed, along with partial corrections to the Drell Yan process [26].…”

NLO corrections to h → b$$ \overline{b} $$ decay in SMEFT

“…Because of the increased complexity of these calculations, results are available only for a handful of processes, and often contain a limited number of operators or are restricted to a particular set of corrections. There are many NLO SMEFT calculations which involve a subset of operators [27][28][29][30][31][32][33][34], or are restricted to QCD corrections only [35][36][37][38][39][40][41][42][43][44][45]. A calculation of Higgs pair production at NNLO in QCD involving dimension-6 operators which contain the Higgs field has also been performed [46].…”

QCD corrections in Standard Model EFT fits to WZ and WW production

“…The leptonic decay channel of W þ W − pair production has been studied at NLO in the SMEFT in a previous work [19]. Here we extend those results to include the leptonic decays from WZ pair production at the LHC in the presence of anomalous three-gauge-boson and anomalous fermiongauge-boson couplings.…”