<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:msub><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> triplet scalar as the origin of the 95 GeV excess?
Saiyad Ashanujjaman, Sumit Banik, Guglielmo Coloretti, Andreas Crivellin, B. R. Mellado Garcia, Anza-Tshilidzi Mulaudzi
Abstract
We explore the possibility that an $SU(2{)}_{L}$ 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 $\ensuremath{\gamma}\ensuremath{\gamma}$ such that its Drell-Yan production via $pp\ensuremath{\rightarrow}{W}^{*}\ensuremath{\rightarrow}H{H}^{\ifmmode\pm\else\textpm\fi{}}$ is sufficient to obtain the desired signal strength, where ${H}^{\ifmmode\pm\else\textpm\fi{}}$ is the charged Higgs component of the triplet. The predictions of this setup are (1) The $\ensuremath{\gamma}\ensuremath{\gamma}$ 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 ${m}_{{H}^{\ifmmode\pm\else\textpm\fi{}}}\ensuremath{\approx}(95\ifmmode\pm\else\textpm\fi{}5)\text{ }\text{ }\mathrm{GeV}$ leading to $\ensuremath{\sigma}(pp\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\tau}\ensuremath{\nu}\ensuremath{\nu})\ensuremath{\approx}0.4\text{ }\text{ }\mathrm{pb}$, 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.