https://doi.org/10.1140/epjc/s10052-016-4423-z
Regular Article - Theoretical Physics
and its impact on 
1
Department of Physics, Liaoning University, Shenyang, 110036, China
2
Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, and School of Physics, Beihang University, Beijing, 100191, China
3
CAS Center for Excellence in Particle Physics, Beijing, 100049, China
* e-mail: nophy0@gmail.com
Received:
5
April
2016
Accepted:
10
October
2016
Published online:
27
October
2016
This study investigates 
in the dimuon distributions and the hadronic contribution 
. The 
decay widths of the vector mesons 
are approximately a factor of 700 larger than the corresponding scalar mesons 
. The ratio of the branching fractions obtained, 
, is approximately 
. The hadronic contribution is also estimated. The relative increase in the 
amplitude is approximately 
. If we select 
eV, then the branching fractions of the vector mesons to the lepton pair are 
and 
for 
and 
, respectively. If we select 
eV, then the updated branching fractions of the scalar mesons to the muon pair are 
and 
for 
and 
, respectively. If we select the recent predicted M1 widths 
eV (arXiv:1607.02169), then the updated branching fractions are 
and 
for 
and 
, respectively. Further studies on , including those on dielectron decay and two-body decay with 
, should be conducted.
© The Author(s), 2016
