Current Status of Radiative B Decays

A current status report on radiative inclusive and exclusive B decays is presented.Comment: 6 pages, talk given at The 3rd International Conference on B Physics and CP Violation, Taipei, Taiwan, December 3-7, 1999, to appear in the Proceedings, minor change

Absorption of solar radiation by solar neutrinos

We calculate the absorption probability of photons radiated from the surface of the Sun by a left-handed neutrino with definite mass and a typical momentum for which we choose |p_1|=0.2 MeV, producing a heavier right-handed antineutrino. Considering two transitions the \nu_1 -> \nu_2 and \nu_2 -> \nu_3 we obtain two oscillation lengths L_{12}=4960.8 m, L_{23}=198.4 m, two absorption probabilities P_{12}^{abs.}=2.5 10^{-67}, P_{23}^{abs.}=1.2 10^{-58} and the two absorption ranges R_{12}^{abs.}=4.47 10^4 R_{\odot}=208.0 au, R_{23}^{abs.}=0.89 10^4 R_{\odot}=41.4 au, using a neutrino mass differences of \sqrt{|\Delta m^2_{12}|}=10 meV, \sqrt{|\Delta m^2_{23}|}=50 meV and associated transition dipole moments. We collect all necessary theoretical ingredients, i.e. neutrino mass and mixing scheme, induced electromagnetic transition dipole moments, quadratic charged lepton mass asymmetries and their interdependence.Comment: 5 pages, 3 figures, typos corrected and reference added, version to appear in Eur. Phys. J.

The photon-neutrino interaction in non-commutative gauge field theory and astrophysical bounds

In this letter we propose a mechanism of left- and right-handed neutrino couplings to photons, which arises naturally in non-commutative gauge field theory. We estimate the predicted additional energy-loss in stars induced by space-time non-commutativity. The usual requirement that any new energy-loss mechanism in globular cluster stars must not significantly exceed the standard neutrino losses implies a scale of non-commutative gauge theory above the scale of weak interactions

The supersymmetric QCD and KL-KS mass difference

Assuming that globally supersymmetric QCD accounts for the discrepancy between the experimental value of the KL-KS mass difference and that obtained from the electroweak model, we extract constraints on the squark masses for different evaluations of the KOO hadronic matrix element.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/24929/1/0000356.pd