標題: Lambda(b) -> Lambda l(+)l(-) form factors and differential branching fraction from lattice QCD
作者: Detmold, William
Lin, C. -J. David
Meinel, Stefan
Wingate, Matthew
物理研究所
Institute of Physics
公開日期: 5-四月-2013
摘要: We present the first lattice QCD determination of the Lambda(b) -> Lambda transition form factors that govern the rare baryonic decays Lambda(b) -> Lambda l(+)l(-) at leading order in heavy-quark effective theory. Our calculations are performed with 2 + 1 flavors of domain-wall fermions, at two lattice spacings and with pion masses down to 227 MeV. Three-point functions with a wide range of source-sink separations are used to extract the ground-state contributions. The form factors are extrapolated to the physical values of the light-quark masses and to the continuum limit. We use our results to calculate the differential branching fractions for Lambda(b) -> Lambda l(+)l(-) with l = e, mu, tau within the standard model. We find agreement with a recent CDF measurement of the Lambda(b) -> Lambda mu(+)mu(-) differential branching fraction. DOI: 10.1103/PhysRevD.87.074502
URI: http://dx.doi.org/10.1103/PhysRevD.87.074502
http://hdl.handle.net/11536/21677
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.87.074502
期刊: PHYSICAL REVIEW D
Volume: 87
Issue: 7
結束頁: 
顯示於類別:期刊論文