Sep 25 – 30, 2023
Protea Hotel King George
Africa/Johannesburg timezone

Search for axions in H → aa → 4γ decays at the LHC’s ATLAS experiment

Sep 25, 2023, 4:45 PM
13m
Regency Room (Protea Hotel King George)

Regency Room

Protea Hotel King George

Contributed Oral Presentation Physics Research Parallel Session 1

Speaker

Ms Hajar Imam (Universite Hassan II, Ain Chock (MA))

Description

The axion particle discovery could answer the big CP problem as it is hypothetically predicted. Hence a study on the exotic decay of the Higgs boson to two Axion Like Particles (ALPs) [1], [2], which in turn decay to two photons, was carried out. This analysis covers the mass range of ALPs between 100 MeV and 60 GeV and ALPs-photon couplings C_aγγ of 10^{−5} to 1, a region that includes signatures with significantly displaced vertices and highly collinear photons, which present the challenges of this analysis. No significant deviation from the SM expectations has been found, excluding a large parameter space of models that could have explained the (g - 2)μ discrepancy.

Index Terms
Higgs, Axion, ALP, Photons, Anomalous Higgs Decays, HDBS

REFERENCES
[1] K. Schmieden, M. Schott, O. Vujinovic, P. Kramer, B. Nachman, and H. Imam. Search for axions in H →aa → 4photon decays with
the ATLAS experiment at the LHC. Technical report, CERN, Geneva, 2022.
[2] M. Schott. Search for short and long-lived axions in H → aa → 4γ decays with the ATLAS experiment at the LHC. Technical report,
CERN, Geneva, 2022.

Abstract Category Particle Physics

Primary author

Ms Hajar Imam (Universite Hassan II, Ain Chock (MA))

Presentation materials