20 research outputs found
Precise Discussion of Time-Reversal Asymmetries in B-meson decays
BaBar collaboration announced that they observed time reversal (T) asymmetry
through meson system. In the experiment, time dependencies of two
distinctive processes, and ( expresses CP value) are compared with each other. In our study, we
examine event number difference of these two processes. In contrast to the
BaBar asymmetry, the asymmetry of events number includes the overall
normalization difference for rates. Time dependence of the asymmetry is more
general and it includes terms absent in one used by BaBar collaboration. Both
of the BaBar asymmetry and ours are naively thought to be T-odd since two
processes compared are related with flipping time direction. We investigate the
time reversal transformation property of our asymmetry. Using our notation, one
can see that the asymmetry is not precisely a T-odd quantity, taking into
account indirect CP and CPT violation of K meson systems. The effect of
is extracted and gives rise to
contribution. The introduced parameters are invariant under rephasing of quarks
so that the coefficients of our asymmetry are expressed as phase convention
independent quantities. Some combinations of the asymmetry enable us to extract
parameters for wrong sign decays of meson, CPT violation, etc. We also
study the reason why the T-even terms are allowed to contribute to the
asymmetry, and find that several conditions are needed for the asymmetry to be
a T-odd quantity.Comment: 29pages, 5 figures. In version3, the title is changed. The difference
between the event number asymmetry and the asymmetry measured by BaBar
experiment is clarifie
Anomaly and Neutron EDM in model with Charge Symmetry
The Standard Model prediction for based on recent
lattice QCD results exhibits a tension with the experimental data. We solve
this tension through gauge boson exchange in the model with `charge symmetry', whose theoretical
motivation is to attribute the chiral structure of the Standard Model to the
spontaneous breaking of gauge group and charge
symmetry. We show that TeV is required to account for the
anomaly in this model. Next, we make a prediction for the
neutron EDM in the same model and study a correlation between
and the neutron EDM. We confirm that the model can solve
the anomaly without conflicting the current bound on the
neutron EDM, and further reveal that almost all parameter regions in which the
anomaly is explained will be covered by future neutron EDM
searches, which leads us to anticipate the discovery of the neutron EDM.Comment: 35 pages, 6 figures. Version accepted for publication in JHE