Lepton flavor violating processes are obtained from the mixings between the ordinary leptons and the exotic leptons in the E6 27 representation. The effects of these lepton mixings are, however, suppressed naturally because of the hierarchy of the charged lepton masses. In the supersymmetric model, significant effects of lepton flavor violation rather appear through the slepton mixings which ar...

The lighter scalar tau lepton τ̃1 may be the lightest scalar lepton and therefore would be found earlier in future collider experiments. We point out the impact of the measurement of the mass and the mixing angle of τ̃ to discriminate the models of SUSY breaking. Furthermore, the measurement of the polarization of τ lepton(Pτ ) from the decaying τ̃1 helps to determine the Yukawa sector of minimal ...

We examine the constraints on the MNS lepton mixing matrix from the present and future experimental data of the neutrino oscillation and lepton number violation processes. We introduce a graphical representation of the CP violation phases which appear in the lepton number violation processes such as neutrinoless double beta decay, the μ− − e+ conversion, and the K decay, K− → π+μ−μ−. Using this...

When lepton flavour effects in thermal leptogenesis are active, they introduce important differences with respect to the case in which they are neglected, the so-called one-flavour approximation. We investigate analytically and numerically the transition from the one-flavour to the two-flavour case when the τ -lepton flavour becomes distinguishable from the other two flavours. We study the impa...

We study the extension of the Minimal Flavour Violation (MFV) hypothesis to the MSSM without R-parity. The novelty of our approach lies in the observation that supersymmetry enhances the global symmetry of the kinetic term and in the fact that we consider as irreducible sources of the flavour symmetry breaking all the couplings of the superpotential including the R-parity violating ones. If R-p...

Non-linearly realized supersymmetry, combined with the Standard Model field content and SU(3) × SU(2) × U(1) gauge invariance, permits local dimension-six operators involving a goldstino, a lepton doublet and a Higgs doublet. These interactions preserve total lepton number if the left-handed goldstino transforms as an antilepton. We discuss the resulting phenomenology, in the simple limit where...

We present the analysis technique and preliminary results of two ongoing analyses at CLEO which put lepton universality and lepton flavor conservation to the test in Υ decays.

ν = q · P M = E − E is the lepton’s energy loss in the nucleon rest frame (in earlier literature sometimes ν = q · P ). Here, E and E′ are the initial and final lepton energies in the nucleon rest frame. Q = −q2 = 2(EE′−−→k · −→k )−ml −ml′ where ml(ml′) is the initial (final) lepton mass. If EE′ sin(θ/2) ≫ m2l , m2l′ , then ≈ 4EE′ sin(θ/2), where θ is the lepton’s scattering angle with respect ...