Analysis of B ---> phi K decays in QCD factorization - INSPIRE

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Analysis of B ---> phi K decays in QCD factorization

Hai-Yang Cheng
(
- Taiwan, Inst. Phys. and
- Brookhaven
)
,
Kwei-Chou Yang
(
- Taiwan, Chung Yuan Christian U.
)

Dec, 2000

12 pages

Published in:

Phys.Rev.D 64 (2001) 074004

e-Print:

hep-ph/0012152 [hep-ph]

DOI:

10.1103/PhysRevD.64.074004

View in:

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Abstract:

We analyze the decay

B\to \phi K

within the framework of QCD-improved factorization. We found that although the twist-3 kaon distribution amplitude dominates the spectator interactions, it will suppress the decay rates slightly. The weak annihilation diagrams induced by

(S-P)(S+P)

penguin operators, which are formally power-suppressed by order

(\Lambda/m_b)^2

, are chirally and logarithmically enhanced. Therefore, these annihilation contributions are not subject to helicity suppression and can be sizable. The predicted branching ratio of

B^-\to\phi K^-

is

(3.8\pm0.6)\times 10^{-6}

in the absence of annihilation contributions and it becomes

(4.3^{+3.0}_{-1.4})\times 10^{-6}

when annihilation effects are taken into account. The prediction is consistent with CLEO and BaBar data but smaller than the BELLE result.

B: hadronic decay
Phi(1020)
B: branching ratio
factorization
quantum chromodynamics
K: wave function
effect: higher-twist
Feynman graph
effect: penguin
amplitude analysis

References(21)

Figures(0)

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