15 research outputs found
New bounds on lepton flavor violating decays of vector mesons and the Z0 boson
We give an estimate for the upper bounds on rates of lepton flavor violating
(LFV) decays M to mu(pm) + e(mp) of vector mesons M = rho0, omega, phi, J/psi,
Upsilon and the Z0 boson in a model independent way, analyzing the
corresponding lowest dimension effective operators. These operators also
contribute to nuclear mu-e-conversion. Based on this observation and using the
existing experimental limits on this LFV nuclear process, we show that the
studied two-body LFV decays of vector bosons are strongly suppressed
independent on the explicit realization of new physics. The upper limits on the
rates of some of these decays are significantly more stringent than similar
limits known in the literature. In view of these results experimental
observation of the two-body LFV decays of vector bosons looks presently
unrealistic.Comment: 4 pages, 1 figur
Charged current weak electroproduction of Delta resonance
We study the weak production of (i.e. and ) in the intermediate
energy range corresponding to the Mainz and TJNAF electron accelerators. The
differential cross sections are found to be of the order of cm/sr, over a range of angles which increases with energy. The
possibility of observing these reactions with the high luminosities available
at these accelerators, and studying the weak N- transition form factors
through these reactions is discussed. The production cross section of
N in the kinematic region of production is also estimated
and found to be small.Comment: 19 pages, REVTEX, 4 figure