Xu, QJ (reprint author), Hangzhou Normal Univ, Dept Phys, Hangzhou 310036, Zhejiang, Peoples R China.
Three new observables for Z factory to measure the weak dipole moment of tau lepton (d(w)(tau)) are proposed. As those observables are employed at LEP-I, the new observables depend on the real and imaginary parts of d(w)(tau) linearly; thus, we calculate the slopes, i.e., the linear coefficients of the dependence, precisely and find that the obtained slopes are much lager than those employed at LEP-I. It means that the signal for the weak dipole moment d(w)(tau) may be enhanced quite a lot if one employs the new observables. Being superior to those at LEP-I, we recommend measuring the weak dipole moment d(w)(tau) in terms of the new observables if reanalyzing the data of LEP-I or doing the measurement at a possible Z factory in the near future.
National Natural Science Foundation of China [11275243, 11147001, 11147023, 11305044]
; State Key Laboratory of Theoretical Physics [Y3KF311CJ1]
; Zhejiang Provincial Natural Science Foundation of China [LQ12A05003]