FIZIKA B 14 (2005)  1, 1 - 12

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B « f0(980) K  DECAYS IN QCD FACTORIZATION

HAI-YANG CHENGa and KWEI-CHOU YANGb

aInstitute of Physics, Academia Sinica, Taipei, Taiwan 115, Republic of China
bDepartment of Physics, Chung Yuan Christian University, Chung-Li, Taiwan 320, Republic of China

Paper devoted to honour the memory of Professor Dubravko TadiŠ

Received 23 October 2004;   Accepted 15 November 2004
Online 31 October 2005

The decay B« f0(980)K is studied within the framework of QCD factorization. Its decay rate is suppressed relative to B«p0 K owing to a destructive interference between (S-P)(S+P) and (V-A)(V-A) penguin contributions. The interference between the (S-P)(S+P) penguin contributions arising from the strange and light quark components of f0(980) is destructive for p/2 > q > 0 and constructive for -p/2 < sinq < 0, with q being the mixing angle of strange and nonstrange quark contents of f0(980) in the two-quark picture for light scalar mesons. A negative mixing angle, as preferred by several f0(980) production experiments, is also supported by the measurement of B« f0(980)K decay. We conclude that the short-distance interactions are not adequate to explain the experimental observation of f0(980)K+ > p0 K+ and  f0(980)K0>~p0K0 decay rates. Possible mechanisms for the enhancement of f0(980)K are discussed.

PACS numbers: 13.25.Hv, 11.38.Bx
UDC 539.126

Keywords: hadronic B decay, scalar meson

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