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

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2915 more authors) (2021) Observation of photon-induced W+ W- production in pp collisions at root s=13 TeV using the ATLAS detector. PHYSICS LETTERS B, 816. 136190-.

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This letter reports the observation of photon-induced production of $W$-boson pairs, $\gamma\gamma\rightarrow WW$. The analysis uses 139 fb$^{-1}$ of LHC proton-proton collision data taken at $\sqrt{s}=13$ 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 $WW\rightarrow e^\pm\nu\mu^\mp\nu$ 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 $\gamma\gamma\rightarrow WW$ process of 3.13$\pm$0.31(stat.)$\pm$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.

Item Type: Article
Additional Information: 41 pages in total, author list starting page 25, 6 figures, 2 tables, published in Phys. Lett. B.. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-21
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Jun 2021 14:28
Last Modified: 18 Jan 2023 22:36
DOI: 10.1016/j.physletb.2021.136190
Open Access URL: https://linkinghub.elsevier.com/retrieve/pii/S0370...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3124881