Fumiyo Uchiyama

GENERALIZED BELL INEQUALITY IN TWO NEUTRAL KAON SYSTEMS

Abstract We present a contradiction between quantum mechanics and local realistic models, Bell inequalities, for correlated two neutral kaon systems. They predict different values for real observables. The magnitude of violation of the inequality in this gedanken experiment is of order |e|, the CP violating parameter.

Vector symmetry and heavy quark decays

Abstract We discuss the consequences of the vector symmetry recently suggested by one of us for the decays of heavy quarks, b and c .

Neutral-kaon regeneration probabilities at asymmetric φ-factory energies

Abstract Theoretical estimates of neutral-kaon regeneration amplitudes and probabilities are given for various materials and kaon momenta between 0.35 and 2.6 GeV/ c . These estimates can be used, in particular, to optimize experimental conditions at asymmetric φ-factories when regeneration of neutral kaons is involved. As an example, this data is used to find best parameters for a test of non-local interferences in quantum mechanics.

Vector symmetry breaking in charmed meson decays

Abstract We discuss the effects of the breaking of vector symmetry for the two-body hadronic decays of charmed mesons, D + and D 0 .

Numerical analysis of vector symmetry breaking in charmed meson decays

Abstract We analyze hadronic D-decays involving two mesons in the final states based on vector symmetry. We perform multiparameter χ2-fits to the data and find that while vector symmetry breaking is not overwhelming for the best fit, higher-order corrections are required to reproduce data.

Bump-like structure in differential KS regeneration cross sections at high energy

Abstract We point out that there might have been seen a structure in differential K S regeneration cross sections in nuclei near the diffraction-like minimum. A few neutrons in the peripheral region which behave incoherently with the majority of nucleons can account for the observed structure. The number of neutrons is estimated to be 1.16 for Pb.

Factorization and vector symmetry in heavy-meson decays

SummaryWe investigate to what extent the effective theory of the vector symmetry satisfies the factorization assumption in the hadronic Cabibbo-allowed two-body decays of D-mesons. Some conclusions from the factorization assumption and the vector symmetry in two-body hadronic B-decays are compared with experiment.

Baryons in the vector limit

Abstract We discuss the nonleptonic decays of Λ c in the vector limit. The symmetry predictions depend on the representations of SU(3) × SU(3) under which the baryons transform. We argue that either (8,1) + (1,8) or (3, 3 ) + ( 3 ,3) is permissible, but that the representation of the light baryons is tied to that of the Λ c .

Longitudinal momentum distributions of heavy-ion fragments in peripheral reaction

The kinematical two-body fragmentation model is generalized to multibody fragmentation. Comparison with statistical model is given and possible experiments to distinguish the two models are suggested.