https://doi.org/10.1140/epjc/s10052-022-10987-6
Regular Article - Theoretical Physics
helicity form factors and the exclusive weak decays
1
School of Physics and Electronics, Hunan University, 410082, Changsha, People’s Republic of China
2
Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications, 410082, Changsha, People’s Republic of China
3
School of Physics, Huazhong University of Science and Technology, 430074, Wuhan, People’s Republic of China
4
School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, People’s Republic of China
Received:
8
July
2022
Accepted:
1
November
2022
Published online:
16
November
2022
The decay width of the 
meson is dominated by the electromagnetic mode 
, and it is thus the longest-lived charged vector meson. In light of this point, we perform the first QCD LCSRs calculation of 
helicity form factors and discuss the experiment potential of discovering exclusive weak decays. The main result is the partial decay widths, which read as 
, 
, 
and 
. We show that these channels are promising in the near future, serving as the first experimental observation of weak decays of a vector meson, and would open up a new playground for precision test of the standard model.
© The Author(s) 2022
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