380 research outputs found
Atomic Parity-Violation and Precision Physics
The atomic parity-violation (APV) parameter QW for a nucleus with `n'
neutrons and `z' protons has been included in the list of pseudo-observables
accessible with the codes TOPAZ0 and ZFITTER. In this way one can add the APV
results in the LEP EWWG `global' electroweak fits, checking the corresponding
effect when added to the existing precision measurements.Comment: 9 Late
CP-Violatiing Asymmetries in e^+e^-\ra t\bar{t} with Longitudinally Polarized Elecrtons
New CP-violating asymmetries of decay leptons in e^+\,e^-\;\ra\;t\,\bar{t},
arising from electric and weak dipole couplings of to and
, are examined in the case of unpolarized and longitudinally polarized
electrons. The new asymmetries measured together with the old ones can help to
determine independently the real and imaginary parts of the electric as well as
weak dipole couplings. Longitudinal beam polarization, if present, obviates the
need for the simultaneous measurement of more than one asymmetry, and enhances
considerably the sensitivity to the CP-violating parameters. Numerical results
are presented for the Next Linear Collider with GeV and
.Comment: 12 pages LaTex,PRL-TH-94/3
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