Iris Publication

UCL IRIS

Institutional Research Information Service

UCL Home»IRIS

IRIS FAQ

IRIS Home
Browse IRIS

Publication Detail

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

Publication Type:

Journal article
Authors:

Aad G, Abbott B, Abbott DC, Abed Abud A, Abeling K, Abhayasinghe DK, Abidi SH, AbouZeid OS, Abraham NL, Abramowicz H, Abreu H, Abulaiti Y, Abusleme Hoffman AC, Acharya BS, Achkar B, Adam L, Adam Bourdarios C, Adamczyk L, Adamek L, Adelman J, Adiguzel A, Adorni S, Adye T, Affolder AA, Afik Y, Agapopoulou C, Agaras MN, Aggarwal A, Agheorghiesei C, Aguilar-Saavedra JA, Ahmad A, Ahmadov F, Ahmed WS, Ai X, Aielli G, Akatsuka S, Akbiyik M, Åkesson TPA, Akilli E, Akimov AV, Al Khoury K, Alberghi GL, Albert J, Alconada Verzini MJ, Alderweireldt S, Aleksa M, Aleksandrov IN, Alexa C, Alexopoulos T, Alfonsi A, Alfonsi F, Alhroob M, Ali B, Ali S, Aliev M, Alimonti G, Allaire C, Allbrooke BMM, Allport PP, Aloisio A, Alonso F, Alpigiani C, Alunno Camelia E, Alvarez Estevez M, Alviggi MG, Amaral Coutinho Y, Ambler A, Ambroz L, Amelung C, Amidei D, Amor Dos Santos SP, Amoroso S, Amrouche CS, Anastopoulos C, Andari N, Andeen T, Anders JK, Andrean SY, Andreazza A, Andrei V, Angelidakis S, Angerami A, Anisenkov AV, Annovi A, Antel C, Anthony MT, Antipov E, Antonelli M, Antrim DJA, Anulli F, Aoki M, Aparisi Pozo JA, Aparo MA, Aperio Bella L, Aranzabal N, Araujo Ferraz V, Arcangeletti C, Arce ATH, Arena E, Arguin JF, et alia
Publication date:

10/08/2021
Journal:

Physics Letters B
Volume:

819
Article number:

136412
Status:

Published
Language:

English
Publisher URL:

https://doi.org/10.1016/j.physletb.2021.136412
DOI:

http://dx.doi.org/10.1016/j.physletb.2021.136412
Notes:

© 2021 The Author. Published by Elsevier B.V. under a Creative Commons license (https://creativecommons.org/licenses/by/4.0/).

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.

Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk