Invisible Higgs decay with B\to Kν\barν constraint

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 (\approx 1 \sim 2 GeV) SM singlet S and becomes invisible. By using the current experimental bound of rare decay B\to Kν\barν and computing the contribution of B\to K SS to (the) B\to K+\cancel{E}, 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\to SS by taking the upper bound value of coupling is at a comparable level with h\to WW/ZZ or WW^(*) decay modes, making the Higgs identifiable but with a different predicted decay BR 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.

16 pages, 4 figures, the version to appear in Phys. Rev. D

References in corpus (6)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• New strategies for New Physics search in B -> K* nu anti-nu, B -> K nu anti-nu and B -> X(s) nu anti-nu decays
• Precision Flavour Physics with $B\to K\nu \bar{\nu }$ and $B\to K{l}^{+}{l}^{-}$
• Tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu in the Standard Model
• Low Scale Leptogenesis and Dark Matter Candidates in an Extended Seesaw Model
• Exclusive B-> M ν\barν (M= π, K, ρ, K^*) Decays and Leptophobic Z^\prime Model

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• Novel Higgs Decays and Dark Matter in the E(6)SSM
• Low Mass Dark Matter and Invisible Higgs Width In Darkon Models
• Exotic Higgs decays in the E6 inspired SUSY models
• Scalar Dark Matter and Standard Model with Four Generations
• Constraints on Scalar Phantoms
• Scalar Dark Matter Search at the LHC through FCNC Top Decay
• A testable scenario of WIMPZILLA with Dark Radiation
• The study of light invisible particles in $B_c$ decays
• Discrimination of the light CP-odd scalars between in the NMSSM and in the SLHM
• Angular distribution as an effective probe of new physics in semi-hadronic three-body meson decays
• Rare decays B\to Mν\barν in the TC2 model and the LHT model
• Superheavy Dark Matter in Light of Dark Radiation
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