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

Chuan Hung Chen, Chao Qiang Geng, Wei Wang

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21 Citations (Scopus)


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

Original languageEnglish
Article number89
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - 2010 Jan 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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