Chiral dynamics and S-wave contributions in semileptonic B decays

被引：49

作者：

Doering, Michael ^{[1
,2
]}

Meissner, Ulf-G ^{[1
,2
,3
,4
,5
]}

Wang, Wei ^{[1
,2
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[2] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[3] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany

[4] Forschungszentrum Julich, JARA FAME, Julich Ctr Hadron Phys, D-52425 Julich, Germany

[5] Forschungszentrum Julich, JARA HPC, D-52425 Julich, Germany

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 10期

关键词：

Rare Decays; B-Physics; Chiral Lagrangians; PERTURBATION-THEORY; FORM-FACTORS; PI-PI; DISPERSIVE REPRESENTATION; FINITE-VOLUME; SCALAR; SCATTERING; MESON; MASS; RESONANCES;

D O I：

10.1007/JHEP10(2013)011

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The flavor-changing neutral current process b -> sl(+)l(-) is beneficial to testing the standard model and hunting for new physics scenarios. In exclusive decay modes like B -> K*(892)l(+)l(-), the S-wave effects may not be negligible and thus have to be reliably estimated. Using the scalar form factors derived from dispersion relations in two channels and matched to Chiral Perturbation Theory, we investigate the S-wave contributions in (B) over bar (0) -> K-pi(+)l(+)l(-), with the K pi invariant mass lying in the vicinity of the mass of K*(892), and B-s -> K(-)K(+)l(+)l(-) with m(KK) similar to m(phi). We find that the S-wave will modify differential decay widths by about 10% in the process of (B) over bar (0) -> K-pi(+)l(+)l(-) and about 5% in B-s -> K(-)K(+)l(+)l(-). A forward-backward asymmetry for the charged kaon in the final state arises from the interference between the S-wave and P-wave contributions. The measurement of this asymmetry offers a new way to determine the variation of the K pi S-wave phase versus the invariant mass.

引用

页数：34

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