Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-19
Phys.Lett. B567 (2003) 235-242
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex, 4 postscript figures. Includes further discussions of invisible decay of Higgs and other mesons in the asymme
Scientific paper
10.1016/j.physletb.2003.06.031
In light of current atmospheric neutrino oscillation data, we revisit the invisible decay of the standard model Higgs boson and other pseudoscalar mesons which can be enhanced because of large number of KK modes in models with right handed singlet neutrinos in large extra dimensions. We find that the invisible decay rate of Higgs can be as large as $H\to b \bar b $ decay rate only for a very restricted region of parameter space. This parameter space is even further restricted if one demands that the dimensionless neutrino Yukawa coupling $\l$ is O(1). We have also studied the scenarios where singlet neutrino propagate in a sub-space, which lowers the string scale $M_{\ast}$ and keeps neutrino Yukawa coupling O(1). We have also considered decays of other spin-0 mesons to $\nu \bar\nu$ and found the rates to be too small for measurement.
Deshpande Nilendra G.
Ghosh Dilip Kumar
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