b → s decays in a model with Z-mediated flavor changing neutral current

被引：8

作者：

Alok, Ashutosh Kumar ^{[1
]}

Gangal, Shireen ^{[2
]}

机构：

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

[2] Deutsch Elektronen Synchrotron DESY, Theory Grp, D-22607 Hamburg, Germany

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 11期

关键词：

CP ASYMMETRIES; PARAMETER; VIOLATION; QUARKS;

D O I：

10.1103/PhysRevD.86.114009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In the scenario with Z-mediated flavor changing neutral current occurring at the tree level due to the addition of a vectorlike isosinglet down-type quark d' to the SM particle spectrum, we perform a chi(2) fit using the flavor physics data and obtain the best fit value along with errors of the tree level Z (b) over bars coupling, U-sb. The fit indicates that the new physics coupling is constrained to be small: we obtain vertical bar U-sb vertical bar <= 3.40 x 10(-4) at 3 sigma. Still, this does allow for the possibility of new physics signals in some of the observables, such as semileptonic CP asymmetry in B-s decays.

引用

页数：6

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