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English

Searches for the Z γ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at √s = 13 TeV with the ATLAS detector

Contributors

ATLAS Collaboration

Collaborators

Akilli, Ece; Ancu, Lucian Stefan; Benoit, Mathieu; Calace, Noemi; Clark, Allan Geoffrey; Coccaro, Andrea; Della Volpe, Domenico; Di Bello, Francesco Armando; Dubreuil, Arnaud; Ferrere, Didier; Golling, Tobias; Gonzalez Sevilla, Sergio; Iacobucci, Giuseppe; Jansky, Roland; Katre, Akshay; Khoo, Teng Jian; Lanfermann, Marie Christine; Lionti, Anthony Eric; March Ruiz, Luis; Mermod, Philippe; Nackenhorst, Olaf; Nessi, Marzio; Paolozzi, Lorenzo; Schramm, Steven; Sfyrla, Anna; Valente, Marco; Wu, Xin

Published in

Journal of High Energy Physics, vol. 1710, p. 112-163

Collection

  • Open Access - SCOAP3

Publication date

2017

Abstract

This article presents searches for the Zγ decay of the Higgs boson and for narrow high-mass resonances decaying to Z γ, exploiting Z boson decays to pairs of electrons or muons. The data analysis uses 36.1 fb −1 of pp collisions at s = 13 $$ \sqrt{s}=13 $$ recorded by the ATLAS detector at the CERN Large Hadron Collider. The data are found to be consistent with the expected Standard Model background. The observed (expected — assuming Standard Model pp → H → Z γ production and decay) upper limit on the production cross section times the branching ratio for pp → H → Z γ is 6.6. (5.2) times the Standard Model prediction at the 95% confidence level for a Higgs boson mass of 125.09 GeV. In addition, upper limits are set on the production cross section times the branching ratio as a function of the mass of a narrow resonance between 250 GeV and 2.4 TeV, assuming spin-0 resonances produced via gluon-gluon fusion, and spin-2 resonances produced via gluon-gluon or quark-antiquark initial states. For high-mass spin-0 resonances, the observed (expected) limits vary between 88 fb (61 fb) and 2.8 fb (2.7 fb) for the mass range from 250 GeV to 2.4 TeV at the 95% confidence level.

Keywords

  • Hadron-Hadron scattering (experiments)
  • Higgs physics

UNIGE affiliation entities

Citation (ISO format)

ATLAS Collaboration. Searches for the Z γ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1710, p. 112–163. doi: 10.1007/JHEP10(2017)112

Main files (1)

Article (Published version)
CC BY

Identifiers

Journal ISSN

1029-8479
389views
139downloads

Technical informations

Creation

01/11/2017 11:39:49

First validation

01/11/2017 11:39:49

Update

13/10/2025 19:39:13

Status update

15/03/2023 02:13:55

Last indexation

10/11/2026 17:25:52
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