Mass effect in polarization investigation at BEPC/BES and the B-factory
Mass effect in polarization investigation at BEPC/BES and the B-factory
We consider the annihilation process of an electron-positron pair into a pair of heavier fermions when the initial electron and position beams are polarized. By calculating the polarization of the final-state particles, we discuss in detail the effect due to the produced particle masses in the $\tau$-charm energy region at …