Λb → Λl+l- form factors and differential branching fraction from lattice QCD

被引：42

作者：

Detmold, William ^{[1
]}

Lin, C. -J. David ^{[2
,3
]}

Meinel, Stefan ^{[1
]}

Wingate, Matthew ^{[4
]}

机构：

[1] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[2] Natl Chiao Tung Univ, Inst Phys, Hsinchu 300, Taiwan

[3] Natl Ctr Theoret Sci, Div Phys, Hsinchu 300, Taiwan

[4] Univ Cambridge, DAMTP, Cambridge CB3 0WA, England

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 07期

基金：

美国国家科学基金会;

关键词：

EFFECTIVE FIELD-THEORY; RADIATIVE DECAYS; CHIRAL FERMIONS; HEAVY; POLARIZATION; RENORMALIZATION; BARYONS; VARIABLES; GAMMA;

D O I：

10.1103/PhysRevD.87.074502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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

引用

页数：21

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