Calculation of Magnetic Penguin Amplitudes in B → φK Decays Using PQCD Approach(Particles and Fields)
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概要
- 論文の詳細を見る
New physics contributions to B decays often arise through chromo-magnetic penguin operators. To look for new physics effects in B decays, it is useful to be able to estimate the hadronic matrix elements for the chromo-magnetic operator. We compute this contribution to B → φK decays using PQCD methods. It is shown that, if the Wilson coefficient of the new physics is same order of magnitude as that of the Standard Model, this operator gives a non-negligible contribution compared to that of the Standard Model (about 30%). We also investigate the value of q^2, which is the momentum transferred by the gluon in the chromo-magnetic penguin operator. We find that the expectation value <q^2> is approximately M^2_B/4, in agreement with a naive guess. This result, however, is very sensitive to the scale dependence of the Wilson coefficient. We also show that the matrix element for the chromo-magnetic penguin operator is independent of the choice of energy scale to a very good approximation.
- 理論物理学刊行会の論文
- 2003-09-25
著者
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Sanda A.I.
Department of Physics, Nagoya University
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Sanda A.i.
Department Of Physics Kanagawa University
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Sanda A.
Department Of Physics Kanagawa University
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Mishima Satoshi
Department Of Physics Nagoya University
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Mishima Satoshi
Department Of Biofunctional Evaluation Molecular Pharmacology Gifu Pharmaceutical University
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MISHIMA Satoshi
Department of Physics, Nagoya University
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