Explaining the 96 GeV Di-photon Anomaly in a Generic 2HDM Type-III

Abstract

Motivated by results recently reported by the CMS Collaboration about an excess in the di-photon spectrum at about 96 GeV, especially when combined with another long-standing anomaly at the same value in the $b\bar{b}$ invariant mass spectrum in four-jet events collected at LEP, we show that a possible explanation to both phenomena can be found at 1$\sigma$ level in a generic 2-Higgs Doublet Model (2HDM) of Type-III in presence of a specific Yukawa texture, wherein Lepton Flavour Violating (LFV) (neutral) currents are induced at tree level. Bounds from Higgs data play a major role in limiting the parameter space of this scenario, yet we find solutions with $m_H=125$ GeV and $m_h=96$ GeV consistent with current theoretical and experimental bounds.

Comments: 16 pages, 7 figures, version accepted for publication in Phys. Lett. B