Constraining the charged Higgs mass in the left-right symmetric model from b→sγ

Abstract

In the context of the left-right symmetric model, the decay b→sγ receives contributions from the gauge interactions mediated mainly by the W_L, through W_L-W_R mixing and also from the Yukawa interactions of the charged and the neutral (flavour-changing) scalars (the latter type of Yukawa interaction has been overlooked in the previous literature). Following the recent CLEO measurement of the inclusive b→sγ process and the measurement of the top-quark mass by the CDF and D0 collaborations, the parameter space of the left-right symmetric model is more squeezed than before.