What Is Not Invariant under Time Reversal?

Abstract

The departure from T invariance in neutral K-meson decays is shown to be directly demonstrable through suitable measurements. The predicted asymmetries include a CP-and T-noninvariant effect larger than any which has been measured so far. u N D E R the assumption of TCP invariance, the as IRO) will be found after a lapse of time T to have observation of KzO -+ 2n decays1 delnonstrates transformed into T noninvariance to the same extent that it demonstrates the failure of CP invariance. Tests of T invariance in Current Algebra,

ResonantCP−ViolatingScalar-Pseudoscalar Transitions atμ+μPilaftsis1 1996Phys. Rev. Lett.555710View full textAdd to dashboardCite

“…Therefore, a muon collider may be the most ideal place to search for large Higgs-Z-boson mixing effects and, more interestingly, observe transitions between Higgs scalars with opposite CP quantum numbers. In fact, if quantum effects allow for a CP-even Higgs scalar, H, to go into the CP-odd Z boson or another CP-odd scalar, A say, such a transition alone would signify CP/T violation in a CPT-invariant theory [2]. In the SM, there is no HZ mixing up to two-loop electroweak order.…”

“…(1) and (2). Yet, electric dipole moment bounds on neutron and electron cannot prevent these CP-violating phases from being large [22].…”

Classical illustrations of CP violation in kaon decays

“…and to lowest order one finds [17] A T = 4 Re ǫ. This relation has recently passed an experimental test at CPLEAR [18].…”

Tests of CPT invariance for neutral flavored meson-antimeson mixing

“…While the LVR relation (2.3) involving the time-reversal parameter α gives a clear prediction for K, namely [16,17] …”

“…[11,16,17]. It has been argued [18] that in order to avoid further assumptions (arising from the use of weak-interaction decays as substitutes for flavour tags) in the interpretation [18][19][20] of data [11], one should directly measure |a|, |b|, |ā| and |b|, and construct asymmetries out of these.…”