• Chinese Physics C
  • Vol. 44, Issue 1, 013101 (2020)
Zhou Rui-Yu1、*, Guo Lei1、*, Fu Hai-Bing1、*, Cheng Wei1、*, and Wu Xing-Gang1、*
Author Affiliations
  • 1Department of Physics, Chongqing University1Department of Physics, Chongqing University, Chongqing 401331, China
  • 1Department of Physics, Guizhou Minzu University2Department of Physics, Guizhou Minzu University, Guiyang 550025, China
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    Abstract

    The heavy quark effective field theory (HQEFT) provides an effective way to deal with heavy meson decays. In this paper, we adopt two different correlators to derive the light-cone sum rules (LCSR) for the transition form factors (TFFs) in the framework of HQEFT. We label the two LCSR results as LCSR- and LCSR- , which stand for the conventional correlator and the right-handed correlator. We observe that the correlation parameter for the branching ratio is , implying a consistency of LCSRs with the other correlators. Furthermore, we obtain and . We also obtain and , both of which agree with the lattice QCD predictions. Thus, HQEFT provides a useful framework for studying B meson decays. Moreover, by using the right-handed correlator, the twist-2 terms are dominant in TFF , as their contribution is over ~97% in the whole region, while the large twist-3 uncertainty of the conventional correlator is greatly suppressed. Hence, the LCSR- predictions can be used to test the properties of the various models for the pion twist-2 distribution amplitudes.
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    Rui-Yu Zhou, Lei Guo, Hai-Bing Fu, Wei Cheng, Xing-Gang Wu. The semileptonic decay within the LCSR approach under heavy quark effective field theory *[J]. Chinese Physics C, 2020, 44(1):
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    Category: Particles and fields
    Received: Oct. 8, 2019
    Accepted: --
    Published Online: Sep. 29, 2020
    The Author Email: Zhou Rui-Yu (zhoury@cqu.edu.cn), Guo Lei (guoleicqu@cqu.edu.cn), Fu Hai-Bing (fuhb@cqu.edu.cn), Cheng Wei (chengw@cqu.edu.cn), Wu Xing-Gang (wuxg@cqu.edu.cn)