Let there be light from a second light Higgs doublet

Abstract

In this article, we demonstrate that the unexpected peak at around $95\mathrm{GeV}$ as seen recently by CMS in the di-photon final state can be explained within the type-I~two-Higgs-doublet model by means of a moderately-to-strongly fermiophobic CP-even Higgs $H$. Depending on the Higgs mass spectrum, the production of such~a~$H$ arises dominantly from vector boson fusion or through a cascade in either $pp\to t\bar{t}$ with $\stackrel{(-)}{t}\to H^{\pm }\stackrel{(-)}{b}\to W^{\pm \ast }H\stackrel{(-)}{b}$ or $pp\to A$ with $A\to W^{\mp }{H}^{\pm }\to W^{\mp }{W}^{\pm }H$ or via $pp\to W^{\pm \ast }\to H^{\pm }H$. In this context, we also discuss other Higgs anomalies such as the LEP excess in Higgsstrahlung and the observation of enhanced rates in $t\bar{t}h$ at both the Tevatron and the LHC, showing that parameters capable of explaining the CMS di-photon signal can address the latter deviations as well. The Higgs spectra that we explore comprise masses between $80\mathrm{GeV}$ and $350\mathrm{GeV}$. While at present all constraints from direct and indirect searches for spin-0 resonances can be shown to be satisfied for such light Higgses, future LHC data will be able to probe the parameter space that leads to a simultaneous explanation of the discussed anomalies.

21 pages, 14 figures; v3: matches version published in JHEP

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