PreprintCC BY 4.0HAL
Search for the rare Higgs boson decay H → Zγ in proton-proton collisions at √s = 13 and 13.6 TeV
Abstract
A search is presented for the rare, loop-induced Higgs boson decay H → Zγ, where Z → ℓ+ℓ- and ℓ = e or μ. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresponding to a total integrated luminosity of 200 fb−1. The analysis design separately considers and optimizes sensitivity to Higgs boson production via gluon-gluon fusion, vector boson fusion, and associated-production processes. The signal is extracted from a simultaneous fit to the invariant mass distributions of the ℓ+ℓ-γ system in the various production channels and event categories. The observed (expected) signal strength μ, defined as the ratio of the measured product the of cross section and decay branching fraction value σ(pp → H)ℬ(H → Zγ) to the corresponding value predicted in the standard model, is found to be μ = 1.10+0.52−0.61 (1.00+0.49−0.46) for a Higgs boson mass of 125.38 GeV. The signal has an observed (expected) significance of 1.9 (2.3) standard deviations.
Related
- A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at s=13TeV
- A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at √s = 13 TeV
- Combined measurements and interpretations of Higgs boson production and decay in proton–proton collisions at s = 13 TeV
- Search for nonresonant triple Higgs boson production in the final state with six bottom quarks in proton-proton collisions at √s = 13 TeV
- Search for dark photons from Higgs boson decays in the gluon-gluon fusion channel in proton-proton collisions at √s=13.6 TeV with the ATLAS detector
BibTeX
@misc{gevorgyan2026search,
title = {{Search for the rare Higgs boson decay H $\to$ Z$γ$ in proton-proton collisions at $\sqrts$ = 13 and 13.6 TeV}},
author = {Arzunik Gevorgyan and Aram Hayrapetyan and Vladimir Makarenko and Armen Tumasyan and Wolfgang Adam and Lisa Benato and Thomas Bergauer and Marko Dragicevic and Stefan Gundacker and Ali Kaan Guven and Priya Sajid Hussain and Manfred Jeitler and Natascha Krammer and Ang Li and Dietrich Liko and Mark Nicholas Matthewman and Andreas Pfeiffer and Jochen Schieck and Robert Schoefbeck and Maryam Shooshtari and Mangesh Sonawane and Niels van den Bossche and Wolfgang Waltenberger and Claudia Wulz and Tahys Janssen and Daniel Ocampo Henao and Thomas van Laer and Pierre van Mechelen and Donya Ahmadi and Jas Bierkens and Nordin Breugelmans and Soumya Dansana and Alexandre de Moor and Martin Delcourt and Stef Duponcheel and Chirayu Gupta and Felix Johannes Heyen and Yanwen Hong and Kai Kang and Pavlo Kashko and Steven Lowette and Inna Makarenko and Saranya Nandakumar and Jeremi Niedziela and Stefaan Tavernier and Michael Tytgat and Gerrit van Onsem and Senne van Putte and Tiepolo Wybouw and Aya Beshr and Bugra Bilin and Franco Caviglia Roman and Barbara Clerbaux and Aloke Kumar Das and Isabelle de Bruyn and Gilles de Lentdecker and Eliott Ducarme and Hugues Evard and Laurent Favart and Ilia Kalaitzidou},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.04402},
eprint = {2609.04402},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759135v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Search for the rare Higgs boson decay H → Zγ in proton-proton collisions at √s = 13 and 13.6 TeV
AU - Arzunik Gevorgyan
AU - Aram Hayrapetyan
AU - Vladimir Makarenko
AU - Armen Tumasyan
AU - Wolfgang Adam
AU - Lisa Benato
AU - Thomas Bergauer
AU - Marko Dragicevic
AU - Stefan Gundacker
AU - Ali Kaan Guven
AU - Priya Sajid Hussain
AU - Manfred Jeitler
AU - Natascha Krammer
AU - Ang Li
AU - Dietrich Liko
AU - Mark Nicholas Matthewman
AU - Andreas Pfeiffer
AU - Jochen Schieck
AU - Robert Schoefbeck
AU - Maryam Shooshtari
AU - Mangesh Sonawane
AU - Niels van den Bossche
AU - Wolfgang Waltenberger
AU - Claudia Wulz
AU - Tahys Janssen
AU - Daniel Ocampo Henao
AU - Thomas van Laer
AU - Pierre van Mechelen
AU - Donya Ahmadi
AU - Jas Bierkens
AU - Nordin Breugelmans
AU - Soumya Dansana
AU - Alexandre de Moor
AU - Martin Delcourt
AU - Stef Duponcheel
AU - Chirayu Gupta
AU - Felix Johannes Heyen
AU - Yanwen Hong
AU - Kai Kang
AU - Pavlo Kashko
AU - Steven Lowette
AU - Inna Makarenko
AU - Saranya Nandakumar
AU - Jeremi Niedziela
AU - Stefaan Tavernier
AU - Michael Tytgat
AU - Gerrit van Onsem
AU - Senne van Putte
AU - Tiepolo Wybouw
AU - Aya Beshr
AU - Bugra Bilin
AU - Franco Caviglia Roman
AU - Barbara Clerbaux
AU - Aloke Kumar Das
AU - Isabelle de Bruyn
AU - Gilles de Lentdecker
AU - Eliott Ducarme
AU - Hugues Evard
AU - Laurent Favart
AU - Ilia Kalaitzidou
PY - 2026
DA - 2026/09/03
PB - HAL
DO - 10.48550/arxiv.2609.04402
UR - https://hal.science/hal-05759135v1
AB - A search is presented for the rare, loop-induced Higgs boson decay H → Zγ, where Z → ℓ^+ℓ^- and ℓ = e or μ. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresponding to a total integrated luminosity of 200 fb^−1. The analysis design separately considers and optimizes sensitivity to Higgs boson production via gluon-gluon fusion, vector boson fusion, and associated-production processes. The signal is extracted from a simultaneous fit to the invariant mass distributions of the ℓ^+ℓ^-γ system in the various production channels and event categories. The observed (expected) signal strength μ, defined as the ratio of the measured product the of cross section and decay branching fraction value σ(pp → H)ℬ(H → Zγ) to the corresponding value predicted in the standard model, is found to be μ = 1.10^+0.52_−0.61 (1.00^+0.49_−0.46) for a Higgs boson mass of 125.38 GeV. The signal has an observed (expected) significance of 1.9 (2.3) standard deviations.
ER -