Other
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..331v&link_type=abstract
The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 331-337 (2001).
Other
Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries, Spontaneous And Radiative Symmetry Breaking, Polarization In Interactions And Scattering, Decays Of K Mesons, Decays Of K Mesons, Elastic Scattering
Scientific paper
Time-Reversal-Invariance non-conservation has for the first time been unequivocally demonstrated in a direct measurement, one of the results of the CPLEAR experiment. What is the situation then with regard to time-reversal-invariance non-conservation in systems other than the neutral kaon system? Two classes of tests of time-reversal-invariance need to be distinguished: the first one deals with parity violating (P-odd)/time-reversal-invariance non-conserving (T-odd) interactions, while the second one deals with P-even/T-odd interactions (assuming CPT conservation this implies C-conjugation non-conservation). Limits on a P-odd/T-odd interaction follow from measurements of the electric dipole moment of the neutron. This in turn provides a limit on a P-odd/T-odd pion-nucleon coupling constant which is less than 10-4 times the weak interaction strength. Limits on a P-even/T-odd interaction are much less stringent. The better constraint stems also from the measurement of the electric dipole moment of the neutron. Of all the other tests, measurements of charge-symmetry breaking in neutron-proton elastic scattering provide the next better constraint. The latter experiments were performed at TRIUMF (at 477 and 347 MeV) and at IUCF (at 183 MeV). Weak decay experiments (e.g., the transverse polarization of the muon in K+-->π0μ+νμ) have the potential to provide comparable or possibly better constraints. .
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