Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at √s = 13 TeV with the ATLAS detector

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00644790" target="_blank" >RIV/68378271:_____/25:00644790 - isvavai.cz</a>

Alternative codes found

RIV/61989592:15310/25:73633837

Result on the web

<a href="https://hdl.handle.net/11104/0374674" target="_blank" >https://hdl.handle.net/11104/0374674</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2025.139671" target="_blank" >10.1016/j.physletb.2025.139671</a>

Result language

angličtina

Original language name

Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at √s = 13 TeV with the ATLAS detector

Original language description

A search for decays of the Higgs boson into a ZZ boson and a light resonance, with a mass of 0.5-3.5 GeV, is performed using the full 140 fb−1 dataset of 13 TeV proton-proton collisions recorded by the ATLAS detector during Run 2 of the LHC. Leptonic decays of the ZZ boson and hadronic decays of the light resonance are considered. The resonance can be interpreted as a J/ψJ/ψ or ηcηc​ meson, an axion-like particle, or a light pseudoscalar in two-Higgs-doublet models. Due to its low mass, it would be produced with high boost and reconstructed as a single small-radius jet of hadrons. A neural network is used to correct the Monte Carlo simulation of the background in a data-driven way. Two additional neural networks are used to distinguish signal from background. A binned profile-likelihood fit is performed on the final-state invariant mass distribution. No significant excess of events relative to the expected background is observed, and upper limits at 95% confidence level are set on the Higgs boson's branching fraction to a ZZ boson and a light resonance. The exclusion limit is ~10% for the lower masses, and increases for higher masses. Upper limits on the effective coupling CZHeff/ΛCZHeff​/Λ of an axion-like particle to a Higgs boson and ZZ boson are also set at 95% confidence level, and range from 0.9 to 2 TeV−1.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

868

Issue of the periodical within the volume

Sept

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

24

Pages from-to

139671

UT code for WoS article

001534621000001

EID of the result in the Scopus database

2-s2.0-105010717054