Year: 2010
Type: article
Abstract: If the Higgs boson were the only particle within the LHC accessible range, precision measurement of the Higgs's properties would play a unique role in studying electroweak symmetry breaking as well as possible new physics. We try to use low energy experiments such as rare $B$ decay to constrain a challenging decay mode of Higgs, in which a Higgs decays to a pair of light ($\ensuremath{\approx}1\ensuremath{\sim}2\text{ }\text{ }\mathrm{GeV}$) SM singlet $S$ and becomes invisible. By using the current experimental bound of rare decay $B\ensuremath{\rightarrow}K\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and computing the contribution of $B\ensuremath{\rightarrow}KSS$ to (the) $B\ensuremath{\rightarrow}K+\mathrm{E\ensuremath{\llap{\not\;}}}$, we obtain an upper bound on the Higgs coupling to such light singlet. It is interesting that the partial width of the invisible decay mode $h\ensuremath{\rightarrow}SS$ by taking the upper bound value of coupling is at a comparable level with $h\ensuremath{\rightarrow}WW/ZZ$ or $W{W}^{(*)}$ decay modes, making the Higgs identifiable but with a different predicted decay branching ratio from [the] standard model Higgs decay. It will then have an impact on precision measurement of the Higgs's properties. We also study the implication for cosmology from such a light singlet and propose a solution to the potential problem.
Authors: C. S. Kim, Seong Chan Park, Kai Wang, Guohuai Zhu
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1584637437