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Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at s=13 TeV with the ATLAS detector
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Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at s=13 TeV with 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.819, 136412
08/2021
DOI: https://doi.org/10.1016/j.physletb.2021.136412

摘要

Nuclear and High Energy Physics
A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m <sub>ℓℓ</sub> <30 GeV is presented. The analysis is performed using 139 fb <sup>−1</sup> 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 <sub>ℓℓ</sub> <30 GeV is determined to be 8.7 <sub>−2.7</sub> <sup>+2.8</sup> fb.

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