常钦, 徐帅, 王娜. QCD因子化框架下无粲Bc→VV衰变过程研究[J]. 信阳师范学院学报(自然科学版), 2017, 30(4): 539-542. DOI: 10.3969/j.issn.1003-0972.2017.04.006
引用本文: 常钦, 徐帅, 王娜. QCD因子化框架下无粲Bc→VV衰变过程研究[J]. 信阳师范学院学报(自然科学版), 2017, 30(4): 539-542. DOI: 10.3969/j.issn.1003-0972.2017.04.006
CHANG Qin, XU Shuai, WANG Na. Charmless Bc→VVDecay in the QCD Factorization Approach[J]. Journal of Xinyang Normal University (Natural Science Edition), 2017, 30(4): 539-542. DOI: 10.3969/j.issn.1003-0972.2017.04.006
Citation: CHANG Qin, XU Shuai, WANG Na. Charmless Bc→VVDecay in the QCD Factorization Approach[J]. Journal of Xinyang Normal University (Natural Science Edition), 2017, 30(4): 539-542. DOI: 10.3969/j.issn.1003-0972.2017.04.006

QCD因子化框架下无粲Bc→VV衰变过程研究

Charmless Bc→VVDecay in the QCD Factorization Approach

  • 摘要: 在QCD因子化框架下对Bc→VV (V代表轻矢量介子)无粲衰变进行了研究.在计算中采用两种方案来处理端点发散问题,方案Ⅰ是采用参数化方法,方案Ⅱ是Cornwall提出的红外有限胶子传播子.结果表明,在Bc→VV过程中,发散只存在于幂次压低的贡献中.与此同时,采用方案Ⅱ后,湮灭图的贡献得到了增强.从数值结果上来看,Bcρ-ω,K*-K*0过程有着较大的分支比,在10-7量级,因而有望在高能物理实验上被较早地观测到.

     

    Abstract: The charmless Bc→VV decays within the framework of QCD factorization were studied. In the evaluation, two different schemes for regulating the end-point divergence were adopted. The schemeⅠwas to use parameterization model, while the scheme Ⅱ was based on the infrared finite gluon propagator of Cornwall prescription. It is found that the end-point divergence appears only in the power-suppressed corrections in the annihilation amplitudes. Numerically, in the decay modes considered in this paper, the Bcρ-ω, K*-K*0 decays have the relatively large branching fractions,on the order of 10-7, and hence are hopeful to be firstly observed by the future experiments.

     

/

返回文章
返回