Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bounds on Tensor operator contribution to B_s --> l+ l- gamma   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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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat