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FIZIKA B 14 (2005) 1, 1 - 12
 
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 Tadiæ
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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