Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-08
Phys.Lett.B668:116-120,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 3 figures, version to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2008.08.015
We investigate the effect of an extra fourth quark generation and FCNC mediated $Z$ and $Z'$ bosons on the rare decay mode $B^- \to \phi \pi^-$. In the standard model, this mode receives only $b \to d$ penguin contributions and therefore, highly suppressed with branching ratio $\sim 5 \times 10^{-9}$. This in turn makes this mode a very sensitive probe for new physics. We find that due to the above mentioned new physics contributions there is a significant enhancement in its branching ratio. Furthermore, the direct CP violation parameter which is identically zero in the SM is found to be quite significant. If this mode will be observed in the upcoming LHCb experiment, it will not only provide a clear signal of new physics but also can be used to constrain the new physics parameter space.
Giri Anjan K.
Mawlong B.
Mohanta Rukmani
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