Author:
Fu Hai-Bing,Cheng Wei,Zhou Rui-Yu,Zeng Long
Abstract
Abstract
In this study,
helicity form factors (HFFs) are investigated by applying the QCD light-cone sum rule (LCSR) approach. The calculation accuracy is up to the next-to-leading order (NLO) gluon radiation correction of twist-(2,3) distribution amplitude. The resultant HFFs at a large recoil point are
and
, in which the contributions from the three particles of the leading order (LO) are so small that they can be safely neglected. The maximal contribution of the NLO gluon radiation correction for
is less than 3%. After extrapolating the LCSR predictions for these HFFs to the whole
-region, we obtain the decay widths for semileptonic decay processes
, which are consistent with the BES-III collaboration predictions within error limits. After considering the
-meson lifetime, we give the branching fractions of
with
; our predictions also agree with the BES-III collaboration results within error limits, especially for the
decay process. Finally, we present the forward-backward asymmetry
and lepton convexity parameter
, and further calculate the mean value of these two observations,
and
, which may provide a way to test those HFFs in future experiments.
Subject
Astronomy and Astrophysics,Instrumentation,Nuclear and High Energy Physics
Cited by
5 articles.
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