TY - JOUR
T1 - Z-mediated charge and CP asymmetries and FCNCs in Bd,s processes
AU - Chen, Chuan Hung
AU - Geng, Chao Qiang
AU - Wang, Wei
PY - 2010/1/1
Y1 - 2010/1/1
N2 - 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
AB - 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
UR - http://www.scopus.com/inward/record.url?scp=84856384041&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856384041&partnerID=8YFLogxK
U2 - 10.1007/JHEP11(2010)089
DO - 10.1007/JHEP11(2010)089
M3 - Article
AN - SCOPUS:84856384041
VL - 2010
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 11
M1 - 89
ER -