Penguin pollution in the B0 ---> J/psi K(S) decay
Oct, 2006
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Abstract:
We present the most complete analysis of the penguin correction to the extraction of the standard-model parameter sin(2\phi_1) from the B^0 -> J/psi K_S decay up to leading power in 1/m_b and to next-to-leading order in \alpha_s, \phi_1 being the weak phase, m_b the b quark mass, and \alpha_s the strong coupling constant. The deviation \Delta S_{J/psi K_S} of the mixing-induced CP asymmetry from sin(2\phi_1) and the direct CP asymmetry A_{J/psi K_S} are both found to be of O(10^{-3}) in a formalism that combines the QCD-improved factorization and perturbative QCD approaches. The above results, different from those of O(10^{-4}) and of O(10^{-2}) obtained in the previous calculations, provide an important standard-model reference for verifying new physics from the B^0 -> J/psi K_S data.- 12.38.Bx
- 11.10.Hi
- 13.25.Hw
- B0: hadronic decay
- J/psi(3100)
- K0(S)
- penguin: effect
- B0: branching ratio
- amplitude analysis
- CP: violation
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