Search for short- and long-lived axion-like particles in H → aa → 4γ decays with the ATLAS experiment at the LHC
department or school: Science, Faculty of
department or school: TRIUMF
department or school: Non UBC
department or school: Physics and Astronomy, Department of
data provider: DSpace
identifier citation: The European Physical Journal C. 2024 Jul 26;84(7):742
rights copyright: The Author(s)
creator: ATLAS Collaboration
issued: 2024-10-24T22:37:07Z
issued: 2024-07-26
description: 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 < Caγ γ / < 1 TeV−1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model 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.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/89515
note: Eur. Phys. J. C (2024) 84:742 https://doi.org/10.1140/epjc/s10052-024-12979-0Regular Article - Experimental PhysicsSearch for short- and long-lived axion-like particles inH → aa → 4γ decays with the ATLAS experiment at the LHCATLAS CollaborationCERN, 1211 Geneva 23, SwitzerlandReceived: 7 December 2023 / Accepted: 2 June 2024© CERN for the benefit of the ATLAS Collaboration 2024Abstract Presented is the search for anomalous Higgsboson decays into two axion-like particles (ALPs) using thefull Run 2 data set of 140 fb−1 of proton-proton collisions ata centre-of-mass energy of 13 TeV recorded by the ATLASexperiment. The ALPs are assumed to decay into two pho-tons, providing sensitivity to recently proposed models thatcould explain the (g − 2)μ discrepancy. This analysis coversan ALP mass range from 100 to 62 GeV and ALP-photoncouplings in the range 10−7 TeV−1 < Caγ γ / < 1 TeV−1,and therefore includes signatures with significantly displacedvertices and highly collinear photons. No significant excessof events above the Standard Model background is observed.Upper limits at 95% confidence level are placed on thebranching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of 10−5 to 3 × 10−2,depending on the hypothesized ALP mass and ALP-photoncoupling strength.Contents1 Introduction . . . . . . . . . . . . . . . . . . . . . .2 The ATLAS detector . . . . . . . . . . . . . . . . . .3 Data set and simulated events . . . . . . . . . . . . .4 Object reconstruction and event selection . . . . . . .4.1 Object reconstruction . . . . . . . . . . . . . . .4.2 Event selection and categorization . . . . . . . .5 Background estimation . . . . . . . . . . . . . . . . .5.1 Two-photon final states in the search for long-lived axion-like particles . . . . . . . . . . . . .5.2 Three- and four-photon final states in the searchfor long-lived axion-like particles . . . . . . . . .5.3 Four-photon final states in the search for promptlydecaying axion-like …
has type: Article
is shown at: 10.14288/1.0447110
language: eng
peer review status: Reviewed
provider: Vancouver : University of British Columbia Library
publisher: Springer Berlin Heidelberg
publisher DOI: 10.1140/epjc/s10052-024-12979-0
rights: Attribution 4.0 International (CC BY 4.0)
rights URI: http://creativecommons.org/licenses/by/4.0/
scholar level: Faculty
type: Text
identifier URI: http://hdl.handle.net/2429/89515