Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510999" target="_blank" >RIV/00216208:11320/25:10510999 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3JXOo-CJlM" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3JXOo-CJlM</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/37w5-glpp" target="_blank" >10.1103/37w5-glpp</a>

Result language
angličtina
Original language name
Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment
Original language description
Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles chi(1) and chi(2), with mo (chi(2)) > m(chi(1)), is induced by a dark Higgs field and a corresponding dark Higgs boson h'. We present a search for dark matter in events with two vertices, at least one of which must be displaced from the interaction region, and missing energy. Using a 365 fb(-1) data sample collected at Belle II, which operates at the SuperKEKB e(+)e(-) collider, we observe no evidence for a signal. We set upper limits on the product of the production cross section sigma(e(+)e(-) -> h'chi(1)chi (2)), and the product of branching fractions B(chi(2) -> chi(1)) e(+)e(-) x B(h' -> x(+)x(-)), where x(+)x(-) indicates mu(+) mu(-), pi(+) pi(-), or K+K-, as functions of h' mass and lifetime at the level of 10(-1) fb. We set model-dependent upper limits on the dark Higgs mixing angle at the level of 10(-5) and on the dark photon kinetic mixing parameter at the level of 10(-3). This is the first search for dark Higgs bosons in association with inelastic dark matter.
Czech name
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Czech description
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Type
J<sub>imp</sub> - 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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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