Signature of new physics in [formula omitted] decay

B Mawlong,R Mohanta,A.K Giri

doi:10.1016/j.physletb.2008.08.015

B Mawlong, R Mohanta + Show 1 more

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https://doi.org/10.1016/j.physletb.2008.08.015

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Journal: Physics Letters B	Publication Date: Aug 14, 2008
Citations: 10	License type: cc-by

Affiliation: University of Hyderabad, Punjabi University

Abstract

We investigate the effect of an extra fourth quark generation and FCNC mediated Z and Z′ bosons on the rare decay mode B−→ϕπ−. In the Standard Model, this mode receives only b→d penguin contributions and therefore, highly suppressed with branching ratio ∼5×10−9. 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.

Highlights

We investigate the effect of an extra fourth quark generation and flavor changing neutral current (FCNC) mediated Z and Z′ bosons on the rare decay mode B− → φπ−
One way of searching for new physics (NP) is by studying the rare decay modes which are induced by flavor changing neutral current (FCNC) transitions
The observed discrepancy between the measured SφKS and SψKS [1] already gave an indication of the possible existence of NP in the B → φKS decay amplitude and this has, in one way, motivated many to carry out intensive search for NP

Summary

Introduction

We investigate the effect of an extra fourth quark generation and FCNC mediated Z and Z′ bosons on the rare decay mode B− → φπ−. We would like to explore the effect of the extra fourth generation of quarks and FCNC mediated Z(Z′) boson(s) in the rare decay mode B− → φπ−, which is a pure penguin induced process, mediated by the quark level transition b → dss. Where it has been found that in some of these new physics models the branching ratio can be enhanced significantly from its corresponding SM value.

Results

Conclusion