New-physics contributions to the forward-backward asymmetry in B → K* μ+ μ-

被引：54

作者：

Alok, Ashutosh Kumar ^{[1
]}

Dighe, Amol ^{[2
]}

Ghosh, Diptimoy ^{[2
]}

London, David ^{[1
]}

Matias, Joaquim ^{[3
]}

Nagashima, Makiko ^{[1
]}

Szynkman, Alejandro ^{[1
]}

机构：

[1] Univ Montreal, Montreal, PQ H3C 3J7, Canada

[2] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[3] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2010年 / 02期

关键词：

Beyond Standard Model; B-Physics; FORM-FACTORS; DECAY; MODEL; X(S)L(+)L(-); RATIO;

D O I：

10.1007/JHEP02(2010)053

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：

We study the forward-backward asymmetry (AFB) and the differential branching ratio (DBR) in B -> K* mu(+) mu(-) in the presence of new physics (NP) with different Lorentz structures. We consider NP contributions from vector-axial vector (VA), scalar-pseudoscalar (SP), and tensor (T) operators, as well as their combinations. We calculate the effects of these new Lorentz structures in the low-q(2) and high-q(2) regions, and explain their features through analytic approximations. We find two mechanisms that can give a significant deviation from the standard-model predictions, in the direction indicated by the recent measurement of AFB by the Belle experiment. They involve the addition of the following NP operators: (i) VA, or (ii) a combination of SP and T (slightly better than T alone). These two mechanisms can be distinguished through measurements of DBR in B -> K* mu(+) mu(-) and AFB in B -> K mu(+) mu(-).

引用

页数：30

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