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

ATLAS Publications; T.M. Carter; A. Hasib; S. Palazzo; A. Søgaard; E.P. Takeva; N. Themistokleous; E.M. Villhauer

doi:10.1016/j.physletb.2021.136412

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

ATLAS Publications, T.M. Carter, A. Hasib, S. Palazzo, A. Søgaard, E.P. Takeva, N. Themistokleous, E.M. Villhauer

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m < 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 → γ 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 → γ branching ratio for m < 30 GeV is determined to be 8.7+2.8−2.7 fb

Original language	English
Article number	136412
Pages (from-to)	1-22
Number of pages	22
Journal	Physics Letters B
Volume	819
Early online date	31 May 2021
DOIs	https://doi.org/10.1016/j.physletb.2021.136412
Publication status	Published - 10 Aug 2021

Access to Document

10.1016/j.physletb.2021.136412Licence: Creative Commons: Attribution (CC-BY)

http://arxiv.org/abs/2103.10322

3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/10/22 → 30/09/25
Project: Research

Cite this

@article{03ee50feeb4b4169a7cb8ef61db21fbc,

title = "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",

abstract = "A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m < 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 → γ 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 theone expected in the Standard Model, is μ = 1.5 ± 0.5. The Higgs boson production cross-section times the H → γ branching ratio for m < 30 GeV is determined to be 8.7+2.8−2.7 fb",

author = "{ATLAS Publications} and Clark, {Philip James} and Sinead Farrington and Yanyan Gao and Christos Leonidopoulos and Martin, {Victoria Jane} and Liza Mijovic and Benjamin Wynne and T.M. Carter and A. Hasib and S. Palazzo and A. S{\o}gaard and E.P. Takeva and N. Themistokleous and E.M. Villhauer",

year = "2021",

month = aug,

day = "10",

doi = "10.1016/j.physletb.2021.136412",

language = "English",

volume = "819",

pages = "1--22",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - 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

AU - ATLAS Publications

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Gao, Yanyan

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijovic, Liza

AU - Wynne, Benjamin

AU - Carter, T.M.

AU - Hasib, A.

AU - Palazzo, S.

AU - Søgaard, A.

AU - Takeva, E.P.

AU - Themistokleous, N.

AU - Villhauer, E.M.

PY - 2021/8/10

Y1 - 2021/8/10

N2 - A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m < 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 → γ 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 theone expected in the Standard Model, is μ = 1.5 ± 0.5. The Higgs boson production cross-section times the H → γ branching ratio for m < 30 GeV is determined to be 8.7+2.8−2.7 fb

AB - A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m < 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 → γ 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 theone expected in the Standard Model, is μ = 1.5 ± 0.5. The Higgs boson production cross-section times the H → γ branching ratio for m < 30 GeV is determined to be 8.7+2.8−2.7 fb

U2 - 10.1016/j.physletb.2021.136412

DO - 10.1016/j.physletb.2021.136412

M3 - Article

SN - 0370-2693

VL - 819

SP - 1

EP - 22

JO - Physics Letters B

JF - Physics Letters B

M1 - 136412

ER -

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

Abstract

Access to Document

Fingerprint

Projects

Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Cite this