Jiro Arafune

CP and T violation tests in neutrino oscillation

We examine how large violation effects of CP and T are allowed in long baseline neutrino experiments. When we attribute only the atmospheric neutrino anomaly to neutrino oscillation we may have large CP-violation effects. When we attribute both the atmospheric neutrino anomaly and the solar neutrino deficit to neutrino oscillation we may have sizable T violation effects proportional to the ratio of the two mass differences; it is difficult to see CP violation since we cannot ignore the matter effect. We give a simple expression for T violation in the presence of matter. {copyright} {ital 1997} {ital The American Physical Society}

The Two Loop Long Range Effect on the Proton Decay Effective Lagrangian

We calculate the two loop long range effect on the proton decay effective Lagrangian. Numerical calculation for suppression factor gives

Experimental bounds on masses and fluxes of nontopological solitons

A_L(

Flavor mixing in the gluino coupling and nucleon decay.

2-loop

Non-Perturbative Evaluation of the Effective Potential of λϕ4 Theory at Finite Temperature in the Super-Daisy Approximation

) = 0.321

Finiteness of Multi-Body Neutrino Exchange Potential Energy in Neutron Stars

for the value of the strong coupling constant

Stability of a Fermi ball against deformation from spherical shape

\alpha_s(m_Z) = 0.116

Stable neutral Fermi ball

. Two loop effect to more general effective Lagrangian is also given.

CP violation and matter effect in long baseline neutrino oscillation experiments

We reanalyze results of various experiments, the original purpose of which was not for the Q-ball or the Fermi-ball searches. Based on these analysis in addition to the available data on Q balls we obtain rather stringent bounds on flux, mass, and a typical energy scale of Q balls and also those of Fermi balls. In case these nontopological solitons are the main component of the dark matter of the galaxy we find that only such solitons with very large quantum numbers are allowed. We also estimate how sensitive the future experiments are to searches for Q balls and Fermi balls.

Erratum:CPviolation and matter effect in long baseline neutrino oscillation experiments [Phys. Rev. D 56, 3093 (1997)]

Flavor mixing in the quark-squark-gluino coupling is studied for the minimal SU(5) SUGRA-GUT model and applied to the evaluation of the nucleon lifetime. All off-diagonal (generation-mixing) elements of Yukawa coupling matrices and of squark and/or slepton mass matrices are included in solving numerically one-loop renormalization group equations for MSSM parameters, and the parameter region consistent with the radiative electroweak symmetry-breaking condition is searched. It is shown that flavor mixing in the gluino coupling for a large tan\ensuremath{\beta} is of the same order of magnitude as the corresponding Kobayashi-Maskawa matrix element in both up-type and down-type sectors. There exist parameter regions where the nucleon decay amplitudes for charged lepton modes are dominated by the gluino dressing process, while for all the examined regions the neutrino mode amplitudes are dominated by the W-ino dressing over the gluino dressing.