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Search for an exotic decay of the Higgs boson into a Z boson and a pseudoscalar particle in proton-proton collisions at $\sqrt{s}$ = 13 TeV

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arxiv 2311.00130 v2 pith:RQB63M7G submitted 2023-10-31 hep-ex

CMS Collaboration This is my paper · ORCID
classification hep-ex
keywords bosonhiggsleptonslimitsmathrmphotonspseudoscalarsearch
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A search for an exotic decay of the Higgs boson to a Z boson and a light pseudoscalar particle (a), decaying to a pair of leptons and a pair of photons, respectively, is presented. The search is based on proton-proton collision data at a center-of-mass energy of $\sqrt{s}$ = 13 TeV, collected with the CMS detector and corresponding to an integrated luminosity of 138 fb$^{-1}$. The analysis probes pseudoscalar masses $m_\mathrm{a}$ between 1 and 30 GeV, leading to two pairs of well-isolated leptons and photons. Upper limits at 95% confidence level are set on the Higgs boson production cross section times its branching fraction to two leptons and two photons. The observed (expected) limits are in the range of 1.1-17.8 (1.7-17.9) fb within the probed $m_\mathrm{a}$ interval. An excess of data above the expected standard model background with a local (global) significance of 2.6 (1.3) standard deviations is observed for a mass hypothesis of $m_\mathrm{a}$ = 3 GeV. Limits on models involving axion-like particles, formulated as an effective field theory, are also reported.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Light scalars within the $\mathcal{CP}$-conserving Aligned-two-Higgs-doublet model

    hep-ph 2024-12 conditional novelty 6.0 of 10

    All seven light-scalar scenarios of the CP-conserving aligned two-Higgs-doublet model contain sizeable parameter regions compatible with current collider and flavour data, with the lightest new scalars bounded by LEP ...

  2. Search for Higgs boson decays into a pair of pseudoscalar particles in the $\gamma\gamma\tau_{\text{had}}\tau_{\text{had}}$ final state using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

    hep-ex 2024-12 accept novelty 6.0 of 10

    Using 140 fb^-1 of 13 TeV pp collisions, ATLAS finds no excess and sets 95% CL upper limits of 0.2% to 2% on B(H to aa to gamma gamma tau tau) for m_a from 10 to 60 GeV.

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