Letter
Open Access

$S U (2)_{L}$ triplet scalar as the origin of the 95 GeV excess?

Saiyad Ashanujjaman^1,2,*, Sumit Banik ^3,4,†, Guglielmo Coloretti ^3,4,‡, Andreas Crivellin^3,4,§, Bruce Mellado^5,6,∥, and Anza-Tshilidzi Mulaudzi^5,6,¶

¹Department of Physics, SGTB Khalsa College, Delhi 110007, India
²Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
³Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH–8057 Zürich, Switzerland
⁴Paul Scherrer Institut, CH–5232 Villigen PSI, Switzerland
⁵School of Physics and Institute for Collider Particle Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa
⁶iThemba LABS, National Research Foundation, PO Box 722, Somerset West 7129, South Africa

^*saiyad.a@iopb.res.in
^†sumit.banik@psi.ch
^‡guglielmo.coloretti@physik.uzh.ch
^§andreas.crivellin@cern.ch
^∥bmellado@mail.cern.ch
^¶anza-tshilidzi.mulaudzi@cern.ch

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Phys. Rev. D 108, L091704 – Published 20 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091704

Abstract

We explore the possibility that an $S U (2)_{L}$ triplet scalar with hypercharge $Y = 0$ is the origin of the 95 GeV diphoton excess. For a small mixing angle with the Standard Model Higgs, its neutral component has naturally a sizable branching ratio to $γ γ$ such that its Drell-Yan production via $p p \to W^{*} \to H H^{\pm}$ is sufficient to obtain the desired signal strength, where $H^{\pm}$ is the charged Higgs component of the triplet. The predictions of this setup are (1) The $γ γ$ signal has a $p_{T}$ spectrum different from gluon fusion but similar to associated production. (2) Photons are produced in association with tau leptons and jets, but generally do not fall into the vector-boson fusion category. (3) The existence of a charged Higgs with $m_{H^{\pm}} \approx (95 \pm 5) GeV$ leading to $σ (p p \to τ τ ν ν) \approx 0.4 pb$ , which is of the same level as the current limit and can be discovered with Run 3 data. (4) A positive definite shift in the $W$ mass as suggested by the current global electroweak fit.

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Phys. Rev. D 108, L091704– Published 20 November, 2023

Vol. 108, Iss. 9 — 1 November 2023

Received 6 July 2023
Accepted 28 October 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091704

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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$S U (2)_{L}$ triplet scalar as the origin of the 95 GeV excess?

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SU(2)L triplet scalar as the origin of the 95 GeV excess?

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$S U (2)_{L}$ triplet scalar as the origin of the 95 GeV excess?