Explanation of the Hints for a 95 GeV Higgs Boson within a 2-Higgs Doublet Model
arxiv(2023)
摘要
We suggest an explanation for and explore the consequences of the excess
around 95 GeV in the di-photon and di-tau invariant mass distributions recently
reported by the CMS collaboration at the Large Hadron Collider (LHC), together
with the discrepancy that has long been observed at the Large Electron-Positron
(LEP) collider in the bb̅ invariant mass. Interestingly, the most recent
findings announced by the ATLAS collaboration do not contradict, or even
support, these intriguing observations. Their search in the di-photon final
state similarly reveals an excess of events within the same mass range, albeit
with a bit lower significance, thereby corroborating and somewhat reinforcing
the observations made by CMS. We demonstrate that the lightest CP-even Higgs
boson in the general 2-Higgs Doublet Model (2HDM) Type-III can explain
simultaneously the observed excesses at approximately 1.3 σ C.L. while
satisfying up-to-date theoretical and experimental constraints. Moreover, the
2HDM Type-III predicts an excess in the pp→ tt̅ H_ SM production
channel of the 125 GeV Higgs boson, H_ SM. This effect is caused by a up
to 12% enhancement of the H_ SMtt Yukawa coupling in comparison to that
predicted by the Standard Model. Such an effect can be tested at the High
Luminosity LHC (HL-LHC), which can either discover or exclude the scenario we
suggest. This unique characteristic of the 2HDM Type-III makes this scenario
with the 95 GeV resonance very attractive for further theoretical and
experimental investigations at the (HL-)LHC and future colliders.
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