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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511270" target="_blank" >RIV/00216208:11320/25:10511270 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=PU9.u-psK_" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=PU9.u-psK_</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 SQUARE ROOT𝑠=13 TeV with the ATLAS detector

Original language description

A search for decays of the Higgs boson into a 𝑍 boson and a light resonance, with a mass of 0.5-3.5 GeV, isperformed using the full 140 fb-1 dataset of 13 TeV proton-proton collisions recorded by the ATLAS detectorduring LHC Run 2. Leptonic decays of the 𝑍 boson and hadronic decays of the light resonance are considered.The resonance can be interpreted as a 𝐽DIVISION SLASH𝜓 or 𝜂𝑐 meson, an axion-like particle, or a light pseudoscalar predictedin two-Higgs-doublet models. Due to its low mass, this resonance is produced with a high Lorentz boost in thelaboratory frame and therefore reconstructed as a single small-radius jet of hadrons. A neural network is usedto correct the Monte Carlo simulation of the total expected background using data from sideband regions. Twoadditional neural networks are used to distinguish signal from background, enhancing the purity of the signalregion. A binned profile-likelihood fit is performed on the final-state invariant mass distribution. No significantexcess of events relative to the expected background is observed, and upper limits at 95% confidence level areset on the Higgs boson&apos;s branching fraction to a 𝑍 boson and a light resonance. The exclusion limit is TILDE OPERATOR+D9110% forthe lower masses, and increases for higher masses. Upper limits on the effective coupling 𝐶eff𝑍𝐻DIVISION SLASHΛ of an axion-likeparticle to a Higgs boson and 𝑍 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

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OECD FORD branch

10300 - Physical sciences

Project

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

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>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, Section B: Nuclear, Elementary Particle and High-Energy Physics

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

868

Issue of the periodical within the volume

2025

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