Chinese Physics C, Volume. 44, Issue 1, (2020)

The semileptonic decay within the LCSR approach under heavy quark effective field theory *

Rui-Yu Zhou1、*, Lei Guo1、*, Hai-Bing Fu1、*, Wei Cheng1、*, and Xing-Gang Wu1、*
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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    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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    Paper Information

    Category: Particles and fields

    Received: Oct. 8, 2019

    Accepted: --

    Published Online: Sep. 29, 2020

    The Author Email: Zhou Rui-Yu (, Guo Lei (, Fu Hai-Bing (, Cheng Wei (, Wu Xing-Gang (