Scrutinizing the 95–100 GeV di-tau excess in the top associated process

Syuhei Iguro; Teppei Kitahara; Yuji Omura

doi:10.1140/epjc/s10052-022-11028-y

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 1053
https://doi.org/10.1140/epjc/s10052-022-11028-y

Regular Article - Theoretical Physics

Scrutinizing the 95–100 GeV di-tau excess in the top associated process

Syuhei Iguro¹^,2, Teppei Kitahara³^,4^,5^b and Yuji Omura⁶

¹ Institute for Theoretical Particle Physics (TTP), Karlsruhe Institute of Technology (KIT), Engesserstraße 7, 76131, Karlsruhe, Germany
² Institute for Astroparticle Physics (IAP), KIT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
³ Institute for Advanced Research, Nagoya University, 464-8601, Nagoya, Japan
⁴ Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, 464-8602, Nagoya, Japan
⁵ Theory Center, IPNS, High Energy Accelerator Research Organization (KEK), 1-1 Oho, 305-0801, Tsukuba, Japan
⁶ Department of Physics, Kindai University, Higashi-Osaka, 577-8502, Osaka, Japan

^b teppeik@kmi.nagoya-u.ac.jp

Received: 16 May 2022
Accepted: 12 November 2022
Published online: 21 November 2022

Abstract

Recently, the CMS collaboration has reported a di-tau excess with a local significance of 2.6–3.1 $σ$ $\sigma$ where the invariant mass is $m_{τ τ} = 95$ $m_{\tau \tau } =95$ –100 GeV. This excess can be interpreted as a light scalar boson that couples to the third generation fermions, particularly top and $τ$ $\tau$ . Based on the simplest model that can account for the CMS di-tau excess, we evaluate experimental sensitivities to the additional light resonance, using the results reported by the ATLAS collaboration. We see that a search for the top-quark associated production of the SM Higgs boson that decays into $τ \bar{τ}$ $\tau {\bar{\tau }}$ sets a strong model-independent limit. We also find that the CP-even scalar interpretation of the light resonance is excluded by the ATLAS results, while the CP-odd interpretation is not.

© The Author(s) 2022

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