Penguin pollution in the B^0 -> J/psi K_S decay

Details Penguin pollution in the B^0 -> J/psi K_S decay Penguin pollution in the B^0 -> J/psi K_S decay

2006-10-11

arxiv.org/abs/hep-ph/0610120v3

JHEP 0703:009,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, REVTeX4; minor corrections, version to appear in JHEP

Scientific paper

10.1088/1126-6708/2007/03/009

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.

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