A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 fb(-1) and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for Z H production, the observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator.

Aad, G., Abbott, B., Abbott, D.c., Abed Abud, A., Abeling, K., Abhayasinghe, D.k., et al. (2022). Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 829 [10.1016/j.physletb.2022.137066].

Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at TeV with the ATLAS detector

G. Aielli;P. Camarri;L. Cerrito;U. De Sanctis;A. Di Ciaccio;
2022-01-01

Abstract

A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 fb(-1) and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for Z H production, the observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator.
2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
Aad, G., Abbott, B., Abbott, D.c., Abed Abud, A., Abeling, K., Abhayasinghe, D.k., et al. (2022). Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 829 [10.1016/j.physletb.2022.137066].
Aad, G; Abbott, B; Abbott, Dc; Abed Abud, A; Abeling, K; Abhayasinghe, Dk; Abidi, Sh; Aboulhorma, A; Abramowicz, H; Abreu, H; Abulaiti, Y; Abusleme Ho...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/305704
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