New-physics contributions to the forward-backward asymmetry in B → K*μ+μ

Kumar Alok, Ashutosh ; Dighe, Amol ; Ghosh, Diptimoy ; London, David ; Matias, Joaquim ; Nagashima, Makiko ; Szynkman, Alejandro (2010) New-physics contributions to the forward-backward asymmetry in B → K*μ+μ Journal of High Energy Physics, 2010 . p. 53. ISSN 1126-6708

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We study the forward-backward asymmetry (AFB) and the differential branching ratio (DBR) in B → K*μ+μ in the presence of new physics (NP) with different Lorentz structures. We consider NP contributions from vector-axial vector (VA), scalarpseudoscalar (SP), and tensor (T) operators, as well as their combinations. We calculate the effects of these new Lorentz structures in the low-q2 and high-q2 regions, and explain their features through analytic approximations. We find two mechanisms that can give a significant deviation from the standard-model predictions, in the direction indicated by the recent measurement of AFB by the Belle experiment. They involve the addition of the following NP operators: (i) VA, or (ii) a combination of SP and T (slightly better than T alone). These two mechanisms can be distinguished through measurements of DBR in B → K*μ+μ and AFB in B → K*μ+μ.

Item Type:Article
Source:Copyright of this article belongs to Springer Verlag.
Keywords:Beyond Standard Model; B-Physics
ID Code:101101
Deposited On:09 Mar 2018 10:23
Last Modified:09 Mar 2018 10:23

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