CP violation in the decay B->X(d)e(+)e(-)

被引:79
作者
Kruger, F
Sehgal, LM
机构
[1] Institut für Theoretische Physik (E), RWTH Aachen, Aachen
关键词
D O I
10.1103/PhysRevD.55.2799
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The decay b-->de(+)e(-) has an amplitude containing comparable contributions proportional to VtbVtd*, VcbVcd*, and VubVud*. These pieces involve different unitarity phases produced by <c(c)over bar> and <u(u)over bar> loops. The simultaneous presence of different CKM phases and different dynamical phases leads to a calculable asymmetry in the partial widths of b-->de(+)e(-) and (b) over bar--><(d)over bar e>(+)e(-). Using the effective Hamiltonian of the standard model, we calculate this asymmetry as a function of the e(+)e(-) invariant mass. The effects of rho, omega, and J/psi resonances are taken into account in the vacuum polarization of the <u(u)over bar> and <c(c)over bar> currents. As a typical result, an asymmetry of -5% (-2%) is predicted in the nonresonant domain 1 GeV<m(e+e-)<m(J/psi), assuming eta=0.34 and rho=0.3 (-0.3). The branching ratio in this domain is 1.2x10(-7) (3.3x10(-7)). Results an also obtained in the region of the J/psi resonance, where an asymmetry of 3x10(-3) is expected, subject to certain theoretical uncertainties in the b-->dJ/psi amplitude.
引用
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页码:2799 / 2805
页数:7
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