Aad, G;
Abbott, B;
Abbott, DC;
Abed Abud, A;
Abeling, K;
Abhayasinghe, DK;
Abidi, SH;
... et alia, .; + view all
(2021)
Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at \sqrt{s} = 13 TeV with the ATLAS detector.
Physics Letters B
, 819
, Article 136412. 10.1016/j.physletb.2021.136412.
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Abstract
A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m_{ℓℓ} < 30 GeV is presented. The analysis is performed using 139 fb^{−1} of proton–proton collision data, produced by the LHC at a centre-of-mass energy of 13 TeV and collected by the ATLAS experiment. Evidence for the H → ℓℓγ process is found with a significance of 3.2 over the background-only hypothesis, compared to an expected significance of 2.1 for the Standard Model prediction. The best-fit value of the signal-strength parameter, defined as the ratio of the observed signal yield to the one expected in the Standard Model, is μ = 1.5 ± 0.5. The Higgs boson production cross-section times the H → ℓℓγ branching ratio for m_{ℓℓ} < 30 GeV is determined to be 8.7_{−2.7}^{+2.8} fb.
| Type: | Article |
|---|---|
| Title: | Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at \sqrt{s} = 13 TeV with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physletb.2021.136412 |
| Publisher version: | https://doi.org/10.1016/j.physletb.2021.136412 |
| Language: | English |
| Additional information: | © 2021 The Author. Published by Elsevier B.V. under a Creative Commons license (https://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10129405 |
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