https://doi.org/10.1140/epjc/s2004-01711-y
theoretical physics
The rare annihilation decays 
Department of Physics, Henan Normal University, Xinxiang, 453002, Henan, P.R. China
* e-mail: yangyd@henannu.edu.cn
We investigate the physics potential of the annihilation decays 
in the standard model and beyond. In a naive factorization approach, the branching ratios are estimated to be 
and 
. In the framework of QCD factorization, we compute the non-factorizable corrections and get 
, 
. Future measurements of these decays would be useful for testing the factorization frameworks. The smallness of these decays in the SM makes them sensitive probes of new physics. As an example, we will consider the possible admixture of the (V + A) charge current to the standard (V-A) current. This admixture will give a significant contribution to the decays.
© Springer-Verlag, 2004
