Covariant light-front approach for B{sub c} transition form factors
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- Institute of Information Science and Engineering, Ocean University of China, Qingdao 266100 (China)
In the covariant light-front quark model, we investigate the form factors of B{sub c} decays into D, D*, D{sub s}, D{sub s}*, {eta}{sub c}, J/{psi}, B, B*, B{sub s}, and B{sub s}* mesons. The form factors in the spacelike region are directly evaluated. To extrapolate the form factors to the physical region, we fit the form factors by adopting a suitable three-parameter form. At the maximally recoiling point, b{yields}u, d, and s transition form factors are smaller than b{yields}c and c{yields}d, s form factors, while the b{yields}u, d, s, and c form factors at the zero-recoiling point are close to each other. In the fitting procedure, we find that parameters in A{sub 2}{sup B{}sub c}{sup B*} and A{sub 2}{sup B{}sub c}{sup B{}sub s}{sup *} strongly depend on decay constants of B* and B{sub s}* mesons. Fortunately, semileptonic and nonleptonic B{sub c} decays are not sensitive to these two form factors. We also investigate branching fractions, polarizations of the semileptonic B{sub c} decays. B{sub c}{yields}({eta}{sub c},J/{psi})l{nu} and B{sub c}{yields}(B{sub s},B{sub s}*)l{nu} decays have much larger branching fractions than B{sub c}{yields}(D,D*,B,B*)l{nu}. For the three kinds of B{sub c}{yields}Vl{nu} decays, longitudinal contributions are comparable with the transverse contributions. These predictions will be tested on the ongoing and forthcoming hadron colliders.
- OSTI ID:
- 21260082
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevD.79.054012; (c) 2009 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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