Large forward-backward asymmetry in B --> K mu+ mu- from new physics tensor operators

Abstract

We study the constraints on possible new physics contribution to the forward-backward asymmetry of muons, A_{FB}(q^2), in B --> K mu+ mu-. New physics in the form of vector/axial-vector operators does not contribute to A_{FB}(q^2) whereas new physics in the form of scalar/pseudoscalar operators can enhance A_{FB}(q^2) only by a few per cent. However new physics the form of tensor operators can take the peak value of A_{FB}(q^2) to as high as 40% near the high-q^2 end point. In addition, if both scalar/pseudoscalar and tensor operators are present, then A_{FB}(q^2) can be more than 15% for the entire high-q^2 region q^2 > 15 GeV^2. The observation of significant A_{FB} would imply the presence of new physics tensor operators, whereas its q^2 dependence could further indicate the presence of new scalar/pseudoscalar physics.

19 pages, 5 figures

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Cited by in corpus (9)

• Differential branching fraction and angular analysis of the $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ decay
• New Physics in b -> s mu+ mu-: CP-Conserving Observables
• New-physics contributions to the forward-backward asymmetry in B -> K* mu+ mu-
• Angular analysis of charged and neutral $B\to K{\mu }^{+}{\mu }^{-}$ decays
• Angular analysis of the decay B${}^{+}$ $\to$ K${}^{+}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Higgs induced FCNC as a source of new physics in $b\to s$ transitions
• Implication of family non-universal $Z^{\prime }$ model to rare exclusive $b\to s(l\bar{l},\nu \bar{\nu })$ transitions
• Finding flavons at colliders
• Implications of the Anomalies in B_s^0-\bar{B}_s^0 Mixing for Anomalous Tensor Couplings