Calculation of B0 →k*0μ+μ- And Bs0 →φμ+μ- Observables using form factors from lattice QCD

Ronald R. Horgan, Zhaofeng Liu, Stefan Meinel, Matthew Wingate

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

We calculate the differential branching fractions and angular distributions of the rare decays B0→K*0μ+μ- and Bs0→φμ+μ-, using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the K* 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 C9 and C9′ to the experimental data for multiple B0→K*0μ+μ- and Bs0→φμ+μ- observables. In agreement with recent results from complementary studies, we obtain C9-C9SM=-1.0±0.6 and C9′=1.2±1.0, whose deviations from zero would indicate the presence of nonstandard fundamental interactions.

Original languageEnglish (US)
Article number212003
JournalPhysical Review Letters
Volume112
Issue number21
DOIs
StatePublished - May 30 2014
Externally publishedYes

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form factors
quantum chromodynamics
deviation
kinematics
angular distribution
operators
physics
expansion
decay
coefficients
products
matrices
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Calculation of B0 →k*0μ+μ- And Bs0 →φμ+μ- Observables using form factors from lattice QCD. / Horgan, Ronald R.; Liu, Zhaofeng; Meinel, Stefan; Wingate, Matthew.

In: Physical Review Letters, Vol. 112, No. 21, 212003, 30.05.2014.

Research output: Contribution to journalArticle

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abstract = "We calculate the differential branching fractions and angular distributions of the rare decays B0→K*0μ+μ- and Bs0→φμ+μ-, using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the K* 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 C9 and C9′ to the experimental data for multiple B0→K*0μ+μ- and Bs0→φμ+μ- observables. In agreement with recent results from complementary studies, we obtain C9-C9SM=-1.0±0.6 and C9′=1.2±1.0, whose deviations from zero would indicate the presence of nonstandard fundamental interactions.",
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