D* polarization as a probe to discriminate new physics in (B)over-bar → D*τ(ν)over-bar

被引：69

作者：

Alok, Ashutosh Kumar ^{[1
]}

Kumar, Dinesh ^{[2
,3
]}

Kumbhakar, Suman ^{[2
]}

Sankar, S. Uma ^{[2
]}

机构：

[1] Indian Inst Technol Jodhpur, Jodhpur 342011, Rajasthan, India

[2] Indian Inst Technol, Bombay 400076, Maharashtra, India

[3] Univ Rajasthan, Jaipur 302004, Rajasthan, India

来源：

PHYSICAL REVIEW D | 2017年 / 95卷 / 11期

关键词：

R-K; ANOMALIES;

D O I：

10.1103/PhysRevD.95.115038

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The confirmation of excess in R-D* at the LHCb is an indication of lepton flavor nonuniversality. Various different new physics operators and their coupling strengths, which provide a good fit to R-D, R-D*, and q(2) spectra, were identified previously. In this work, we try to find angular observables in (B) over bar -> D*tau(nu) over bar which enable us to distinguish between these new physics operators. We find that the D* polarization fraction f(L)(q(2)) is a good discriminant of scalar and tensor new physics operators. The change in < f(L)(q(2))>, induced by scalar and tensor operators, is about 3 times larger than the expected uncertainty in the upcoming Belle measurement.

引用

页数：7

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