https://doi.org/10.1140/epjc/s10052-015-3449-y
Regular Article - Theoretical Physics
from the semileptonic decays of 
mesons
College of Science, National University of Defense Technology, Changsha, Hunan, 410073, People’s Republic of China
* e-mail: lfgan@nudt.edu.cn
Received:
8
April
2015
Accepted:
9
May
2015
Published online:
27
May
2015
In the framework of heavy quark effective theory, the leading-order Isgur–Wise form factors relevant to semileptonic decays of the ground state 
meson 
into orbitally excited 
-wave 
mesons, including the newly observed narrow 
and 
states by the LHCb Collaboration, are calculated with the QCD sum rule method. With these universal form factors, the decay rates and branching ratios are estimated. We find that the decay widths are 
, 
, 
, and 
. The corresponding branching ratios are 
, 
, 
, and 
. The decay widths and branching ratios of corresponding 
semileptonic processes are also predicted.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
