Lepton flavor-violating Higgs decays mediated by ultralight gauge boson

Marcela Marín; R. Gaitán; R. Martinez

doi:10.1140/epjc/s10052-024-13665-x

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 1293
https://doi.org/10.1140/epjc/s10052-024-13665-x

Regular Article - Theoretical Physics

Lepton flavor-violating Higgs decays mediated by ultralight gauge boson

Marcela Marín¹^a, R. Gaitán¹ and R. Martinez²

¹ Departamento de Física, FES-Cuautitlán, UNAM, C.P. 54770, Estado de México, Mexico
² Departamento de Física, Universidad Nacional de Colombia, K. 45 No. 26-85, Bogotá, Colombia

^a marcemarino8a@cuautitlan.unam.mx

Received: 27 September 2024
Accepted: 28 November 2024
Published online: 20 December 2024

Abstract

We present an analysis of the lepton-flavor violating decay of the Higgs boson mediated by an ultralight gauge boson, $χ$ $\chi$ . Our analysis matches a model generating the lepton flavor-violating interaction ${\bar{ℓ}}_{i} ℓ_{j} χ$ $\bar{\ell }_i\ell _j\chi$ at tree level with an effective field theory, safeguarding a physical massless $χ$ $\chi$ -boson limit of the observables. By utilizing the upper bounds on $H \to ℓ_{i} {\bar{ℓ}}_{j}$ $H\rightarrow \ell _i {\bar{\ell }}_j$ decays from CMS and ATLAS Collaborations, we establish an indirect upper limit on the nonstandard decay $H \to ℓ_{i} {\bar{ℓ}}_{j} χ$ $H\rightarrow \ell _i {\bar{\ell }}_j\chi$ . The analysis encompasses various observables such as the lepton energy spectrum, Dalitz plot distribution, and Lepton Charge and Forward-Backward Asymmetries.

© The Author(s) 2024

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