Branching ratio and polarization of B{yields}{rho}({omega}){rho}({omega}) decays in perturbative QCD approach
- CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)
In this work, we calculate the branching ratios, polarization fractions and CP asymmetry parameters of decay modes B{yields}{rho}({omega}){rho}({omega}) in the perturbative QCD approach, which is based on k{sub T} factorization. After calculation, we find that the branching ratios of B{sup 0}{yields}{rho}{sup +}{rho}{sup -}, B{sup +}{yields}{rho}{sup +}{rho}{sup 0}, and B{sup +}{yields}{rho}{sup +}{omega} are at the order of 10{sup -5}, and their longitudinal polarization fractions are more than 90%. The above results agree with BaBar's measurements. We also calculate the branching ratios and polarization fractions of B{sup 0}{yields}{rho}{sup 0}{rho}{sup 0}, B{sup 0}{yields}{rho}{sup 0}{omega}, and B{sup 0}{yields}{omega}{omega} decays. We find that their longitudinal polarization fractions are suppressed to 60-80% due to a small color suppressed tree contribution. The dominant penguin and nonfactorization tree contributions equally contribute to the longitudinal and transverse polarization, which will be tested in the future experiments. We predict the CP asymmetry of B{sup 0}{yields}{rho}{sup +}{rho}{sup -} and B{sup +}{yields}{rho}{sup +}{rho}{sup 0}, which will be measured in B factories.
- OSTI ID:
- 20774609
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 1; Other Information: DOI: 10.1103/PhysRevD.73.014024; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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