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

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Abstract

We show model-independently that the negative like-sign charge asymmetry (−A sℓ b) is less than 3.16 × 10−3 when the constraints from the \( {B_q} - {\bar{B}_q} \) mixings and the time-dependent CP asymmetries (CPAs) for B q → J/ΨM q with M q = 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 \( \left( {2.3_{ - 0.5}^{ + 0.6}} \right) \times {10^{ - 4}} \). To illustrate the potential large |A sℓ b|, 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 sin2β s J/Ψϕ could reach to −15%; (c) the CPA of sin \( 2{\beta_{\phi {K_S}}} \) could be higher than sin \( 2{\beta_{{{J} \left/ {{{{\uppsi }}{K_S}}} \right.}}} \) when |A sℓ b| is larger than the SM prediction; and (d) the branching ratio for B s → μ + μ − could be as large as 0.6 × 10−8.

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Authors and Affiliations

  1. Department of Physics, National Cheng-Kung University, Tainan, 701, Taiwan

    Chuan-Hung Chen

  2. National Center for Theoretical Sciences, Hsinchu, 300, Taiwan

    Chuan-Hung Chen

  3. Department of Physics, National Tsing-Hua University, Hsinchu, 300, Taiwan

    Chao-Qiang Geng

  4. Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, 70126, Italy

    Wei Wang

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  1. Chuan-Hung Chen
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Correspondence to Chuan-Hung Chen.

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Chen, CH., Geng, CQ. & Wang, W. Z-mediated charge and CP asymmetries and FCNCs in B d,s processes. J. High Energ. Phys. 2010, 89 (2010). https://doi.org/10.1007/JHEP11(2010)089

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