Original scientific paper

B → f0(980) K decays in QCD factorization

Hai-Yang Cheng ; Institute of Physics, Academia Sinica, Taipei, Taiwan 115, Republic of China
Kwei-Chou Yang ; Department of Physics, Chung Yuan Christian University, Chung-Li, Taiwan 320, Republic of China

Abstract

The decay B → f0(980)K is studied within the framework of QCD factorization. Its decay rate is suppressed relative to B → π 0K 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 π/2 > θ > 0 and constructive for −π/2 < sin θ < 0, with θ 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+ > π0K+ and f0(980)K0 >∼ π 0K0 decay rates. Possible mechanisms for the enhancement of f0(980)K are discussed.

Keywords

hadronic B decay; scalar meson

Hrčak ID:

304082

URI

https://hrcak.srce.hr/304082

Publication date:

1.3.2005.

Article data in other languages: croatian

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