252 research outputs found
Probing the gauge symmetry breaking of the early universe in 3-3-1 models and beyond by gravitational waves
Taking the 3-3-1 models (with gauge
group) as examples, we study that a class of new physics models with extended
gauge group could undergo one or several first-order phase transitions
associated with the spontaneously symmetry breaking processes during the
evolution of the universe, which can produce detectable phase transition
gravitational wave (GW) signals at future GW experiments, such as LISA, BBO,
DECIGO, SKA and aLIGO. These GW signals can provide new sources of GWs with
different peak frequencies, and can be used to probe the evolution history of
the universe.Comment: Published version for Physics Letters
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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