Measurements of the pp to W+- gamma gamma and pp to Z gamma gamma cross sections at sqrt(s) = 13 TeV and limits on anomalous quartic gauge couplingsстатья
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Дата последнего поиска статьи во внешних источниках: 3 ноября 2021 г.
Аннотация:The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb−1 collected by the CMS experiment at the LHC. The W→ℓν and Z→ℓℓ decay modes (where ℓ= e,μ) are used to extract the Wγγ and Zγγ cross sections in a phase space defined by electron (muon) with transverse momentum larger than 35 (30) GeV and photon transverse momentum larger than 20 GeV. The measured cross sections in this phase space are σ(Wγγ)=13.6+1.9−1.9 (stat) +4.0−4.0 (syst) ± 0.08 (PDF+scale) fb and σ(Zγγ)=5.41+0.58−0.55 (stat) +0.64−0.70 (syst) ± 0.06 (PDF+scale) fb. Limits on anomalous quartic gauge couplings are set in the framework of an effective field theory with dimension-8 operators.