What can we learn from B{yields}a{sub 1}(1260)(b{sub 1}(1235)){pi}(K) decays?
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
We investigate the B{yields}a{sub 1}(1260)(b{sub 1}(1235)){pi}(K) decays under the factorization scheme and find many discrepancies between theoretical predictions and the experimental data. In the tree-dominated processes, large contributions from color-suppressed tree diagrams are required in order to accommodate the large decay rates of B{sup -}{yields}a{sub 1}{sup 0}{pi}{sup -} and B{sup -}{yields}a{sub 1}{sup -}{pi}{sup 0}. For B{sup 0}{yields}(a{sub 1}{sup +},b{sub 1}{sup +})K{sup -} decays which are induced by b{yields}s transition, theoretical predictions on their decay rates are larger than the data by a factor of 2.8 and 5.5, respectively. Large electroweak penguins or some new mechanism are expected to explain the branching ratios of B{sup -}{yields}b{sub 1}{sup 0}K{sup -} and B{sup -}{yields}a{sub 1}{sup -}K{sup 0}. The soft-collinear effective theory has the potential to explain large decay rates of B{sup -}{yields}a{sub 1}{sup 0}{pi}{sup -} and B{sup -}{yields}a{sub 1}{sup -}{pi}{sup 0} via a large hard-scattering form factor {zeta}{sub J}{sup B{yields}}{sup a{sub 1}}. We will also show that, with proper charming penguins, predictions on the branching ratios of B{sup 0}{yields}(a{sub 1}{sup +},b{sub 1}{sup +})K{sup -} can also be consistent with the data.
- OSTI ID:
- 21254278
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 7; Other Information: DOI: 10.1103/PhysRevD.78.074009; (c) 2008 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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