Calculation of B[superscript 0] → K[superscript *0]μ[superscript +]μ[superscript -] and B[0 over s] → φμ[superscript +]μ[superscript -] Observables Using Form Factors from Lattice QCD
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PhysRevLett.112.212003.pdf
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Author(s)
Horgan, Ronald R.
Liu, Zhaofeng
Meinel, Stefan
Wingate, Matthew
Date Issued
May 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Horgan, Ronald R., Zhaofeng Liu, Stefan Meinel, and Matthew Wingate. “Calculation of B[superscript 0] → K[superscript *0]μ[superscript +]μ[superscript -] and B[0 over s] → φμ[superscript +]μ[superscript -] Observables Using Form Factors from Lattice QCD.” Physical Review Letters 112, no. 21 (May 2014). © 2014 American Physical Society
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Final published version
Abstract
We calculate the differential branching fractions and angular distributions of the rare decays B[superscript 0] → K[superscript *0]μ[superscript +]μ[superscript -] and B[0 over s] → φμ[superscript +]μ[superscript -], using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the K[superscript *] or ϕ recoils softly; there, the newly available form factors are most precise and the nonlocal matrix elements can be included via an operator product expansion. Our results for the differential branching fractions calculated in the standard model are higher than the experimental data. We consider the possibility that the deviations are caused by new physics and perform a fit of the Wilson coefficients C[subscript 9] and C[' over 9] to the experimental data for multiple B[superscript 0] → K[superscript *0]μ[superscript +]μ[superscript -] and B[0 over s] → φμ[superscript +]μ[superscript -] observables. In agreement with recent results from complementary studies, we obtain C[subscript 9] − C[SM over 9] = −1.0 ± 0.6 and C[' over 9] = 1.2 ± 1.0, whose deviations from zero would indicate the presence of nonstandard fundamental interactions.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.112.212003
