Bounds on Tensor operator contribution to B_s --> l+ l- gamma

Details Bounds on Tensor operator contribution to B_s --> l+ l- gamma Bounds on Tensor operator contribution to B_s --> l+ l- gamma

2006-11-16

arxiv.org/abs/hep-ph/0611215v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, no figures; We have corrected an error in our previous analysis, added references

Scientific paper

We consider the effect of new physics interactions in the form of tensor operators on the branching ratio of B_s --> l+ l- gamma where l=e, mu. We find that the present data on the inclusive branching ratio B --> X_s l+ l- puts a strong constraint on the new physics tensor couplings and does not allow a large enhancement in the branching ratio of B_s --> l+ l- gamma beyond its standard model predictions. Large enhancement in the branching ratio of B_s --> l+ l- gamma due to new physics in the form of vector/axial-vector, scalar/pseudoscalar and magnetic dipole operators has already been ruled out. Thus we conclude that no new physics can provide a large enhancement in the branching ratio of B_s --> l+ l- gamma and hence it is expected to be observed in future experiments with a branching ratio close to its standard model expectation.

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