Width effects of theZ resonance and CP-violating asymmetry ine+e− annihilation
Anjan S Joshipura Saurabh D Rindani
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CP-violating rate asymmetry can be generated in a process only if its amplitude possesses an absorptive part. It is pointed out that such an absorptive part can be provided ine+e− annihilation by the presence of aZ(Z′) resonance of non-zero width. The CP asymmetry in the process$$e^ + e^ - \to l_i \bar l\left( {l_i \bar l_j } \right)$$, whereli are charged leptons, is discussed in several models. In a specific two-Z model, large and observable CP asymmetry ine+e− →τ+e− (τ−e+) is shown to be possible at LEP/SLC energies.
Anjan S Joshipura1 Saurabh D Rindani1
Volume 96, 2022
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