2,166 research outputs found
Disorder effects on the quantum coherence of a many-boson system
The effects of disorders on the quantum coherence for many-bosons are studied
in a double well model. For the ground state, the disorder enhances the quantum
coherence. In the deep Mott regime, dynamical evolution reveals periodical
collapses and revivals of the quantum coherence which is robust against the
disorder. The average over variations in both the on-site energy and the
interaction reveals a beat phenomenon of the coherence-decoherence oscillation
in the temporal evolution.Comment: 4 figure
Bounds On Anomalous Magnetic And Electric Moments Of Tau Lepton From LEP And Lepton Flavor Violation
The most stringent bounds on the anomalous magnetic and electric dipole
moments of the tau lepton was derived by Escribano and Mass\'{o}[6] from the Z
width at LEP in an effective lagrangian approach to the new physics. In this
paper we point out that the higher dimensional operators introduced by
Escribano and Mass\'{o} not only modify the neutral currents of the tau lepton
to Z gauge boson and the photon, but also induce lepton flavor violation (LFV).
The size of the LFV effect depends crucially on the dynamics of the lepton mass
generation. Assuming the lepton mass matrices in the form of an Fritzsch
ansatz, we point out that the experimental limit on will
push the anomalous magnetic and electric dipole moments of the tau lepton down
to and respectively.Comment: 6 pages, latex, no figure
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