Z-mediated charge and CP asymmetries and FCNCs in Bd,s processes

Chuan Hung Chen, Chao Qiang Geng, Wei Wang

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

We show model-independently that the negative like-sign charge asymmetry (-Ab sℓ) is less than 3.16 × 10-3 when the constraints from the Bq - B̄q mixings and the time-dependent CP asymmetries (CPAs) for Bq → J/ψq with Mq = K, φ and q = d, s are taken into account. Although the result is smaller than the measured value by the DØ Collaboration at Fermilab, there is still plenty of room to have new physics, which is sensitive to new CP violating effects, as the standard model (SM) prediction is (2.3-0.5+0.6)× 10-4. To illustrate the potential large |Ab sℓ|, we show the influence of new SU(2)L singlet exotic quarks in the vector-like quark model, where the Z-mediated flavor changing neutral currents (FCNCs) are generated at tree level. In particular, we demonstrate that (a) the like-sign charge asymmetry could be enhanced by a factor of two in magnitude; (b) the CPA of sin 2βsJ/ψφ could reach to -15%; (c) the CPA of sin 2βφKS could be higher than sin 2β ψJ/KS when |Asℓb

原文English
文章編號89
期刊Journal of High Energy Physics
2010
發行號11
DOIs
出版狀態Published - 2010 一月 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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