Revisiting charmless hadronic B decays to scalar mesons

被引：68

作者：

Cheng, Hai-Yang ^{[1
]}

Chua, Chun-Khiang ^{[2
]}

Yang, Kwei-Chou ^{[2
]}

Zhang, Zhi-Qing ^{[1
,3
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 115, Taiwan

[2] Chung Yuan Christian Univ, Dept Phys, Chungli 320, Taiwan

[3] Henan Univ Technol Zhengzhou, Dept Phys, Zhengzhou 450052, Henan, Peoples R China

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 11期

基金：

中国国家自然科学基金;

关键词：

QCD FACTORIZATION; A(0)(980);

D O I：

10.1103/PhysRevD.87.114001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Hadronic charmless B decays to scalar mesons are studied within the framework of QCD factorization (QCDF). Considering two different scenarios for scalar mesons above 1 GeV, we find that the data favor the scenario in which the scalars a(0)(1450) and K-0*(1430) are the lowest lying q (q) over bar bound states. This in turn implies a preferred four-quark nature for light scalars below 1 GeV. Assuming K-0*(1430) being a lowest lying q<s)over bar> state, we show that the data of B -> K-0*(1430)eta((')) and B -> K-0*(1430)(rho, omega, phi) can be accommodated in QCDF without introducing power corrections induced from penguin annihilation, while the predicted B- -> (K) over bar (0)*(0)(1430)pi(-) and (B) over bar (0) -> K-0*(-)(1430)pi(+) are too small compared to the experiment. In principle, the data of K-0*(1430)pi modes can be explained if penguin-annihilation induced power corrections are taken into account. However, this will destroy the agreement between theory and experiment for (B) over bar -> K-0*(1430)(eta('), rho, omega, phi). Contrary to the pseudoscalar meson sector where B -> K eta' has the largest rate in 2-body decays of the B meson, we show that B(B -> K-0*eta') < B(B -> K-0*eta). The decay <(B)over bar>(0) -> a(0)(980)K-+(-) is found to have a rate much smaller than that of (B) over bar (0) -> a(0)(980)(+)pi(-) in QCDF, while it is the other way around in pQCD. Experimental measurements of these two modes will help discriminate between these two different approaches. Assuming 2-quark bound states for f(0)(980) and f(0)(500), the observed large rates of f(0)(980)K and f(0)(980)K* modes can be explained in QCDF with the f(0)(980) - f(0)(500) mixing angle theta in the vicinity of 20 degrees. However, this does not necessarily imply that a 4-quark assignment for f(0)(980) is ruled out because of extra diagrams contributing to B -> f(0)(980)K(*). Irrespective of the mixing angle theta, the predicted branching fraction of B-0 -> f(0)(980)rho(0) is far below the Belle measurement, and this needs to be clarified in the future.

引用

页数：17

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