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Observation of photon-induced W+W− production in pp collisions at s=13 TeV using the ATLAS detector
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Observation of photon-induced W+W− production in pp collisions at s=13 TeV using the ATLAS detector

G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.816, 136190
05/2021
DOI: https://doi.org/10.1016/j.physletb.2021.136190

摘要

Nuclear and High Energy Physics
This letter reports the observation of photon-induced production of W-boson pairs, γγ→WW. The analysis uses 139 fb −1 of LHC proton–proton collision data taken at s=13 TeV recorded by the ATLAS experiment during the years 2015–2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as WW→e ± νμ ∓ ν final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the γγ→WW process of 3.13±0.31(stat.)±0.28(syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction.

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