Large forward-backward asymmetry in B→Kμ+μ from new physics tensor operators

Alok, Ashutosh Kumar ; Dighe, Amol ; Uma Sankar, S. (2008) Large forward-backward asymmetry in B→Kμ+μ from new physics tensor operators Physical Review D, 78 (11). Article ID 114025. ISSN 1550-7998

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Official URL: http://journals.aps.org/prd/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevD.78.114025

Abstract

We study the constraints on possible new physics contributions to the forward-backward asymmetry of muons, AFB(q2), in B→Kμ+μ. New physics in the form of vector/axial-vector operators does not contribute to AFB(q2), whereas new physics in the form of scalar/pseudoscalar operators can enhance , AFB(q2) only by a few percent. However, new physics in the form of tensor operators can take the peak value of AFB(q2) to as high as 40% near the high-q2 end point. In addition, if both scalar/pseudoscalar and tensor operators are present, then AFB(q2) can be more than 15% for the entire high- q2 region q2>15  GeV2. The observation of significant AFB would imply the presence of new physics tensor operators, whereas its q2 dependence could further indicate the presence of new scalar/pseudoscalar physics.

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