Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g −2)μ discrepancy. This analysis covers an ALP mass range from 100 to 62 GeV and ALP-photon couplings in the range 10−7 TeV−1 < Caγγ /_ < 1TeV−1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the StandardModel background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the fourphoton final state, and are in the range of 10−5 to 3 × 10−2, depending on the hypothesized ALP mass and ALP-photon coupling strength.

Search for short- and long-lived axion-like particles in $$H\rightarrow a a \rightarrow 4\gamma $$ decays with the ATLAS experiment at the LHC / G. Aad, B.A.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 84:7(2024 Jul 26), pp. 742.1-742.31. [10.1140/epjc/s10052-024-12979-0]

Search for short- and long-lived axion-like particles in $$H\rightarrow a a \rightarrow 4\gamma $$ decays with the ATLAS experiment at the LHC

A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;D.P. Mungo;A. Murrone;L. Perini;F. Ragusa;A. Stabile;
2024

Abstract

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g −2)μ discrepancy. This analysis covers an ALP mass range from 100 to 62 GeV and ALP-photon couplings in the range 10−7 TeV−1 < Caγγ /_ < 1TeV−1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the StandardModel background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the fourphoton final state, and are in the range of 10−5 to 3 × 10−2, depending on the hypothesized ALP mass and ALP-photon coupling strength.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
26-lug-2024
https://link.springer.com/article/10.1140/epjc/s10052-024-12979-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1083728
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