02 01 1 v 2 1 4 A pr 1 99 8 Upper Limit on the Decay K + → e + ν μ + μ −

Implication of improved upper bounds on |1L| = 2 processes

We discuss implications of improved upper bounds on the |1L| = 2 processes (i) K+ → π−μ+μ+, from an experiment at BNL, and (ii) μ− → e+ conversion, from an experiment at PSI. In particular, we address the issue of constraints on neutrino masses and mixing, and on supersymmetric models with R-parity violation.  2000 Published by Elsevier Science B.V. PACS: 13.20.Eb; 14.60.Pq; 14.60.St; 14.80.Ly...

Upper Limit on the Decay K + → e + ν μ + μ −

An upper limit on the branching ratio for the decay K+ → e+νμ+μ− is set at 5.0× 10−7 at 90% confidence level, consistent with predictions from chiral perturbation theory.

Hadronic mass spectrum analysis of D + → K − π + µ + ν decay and measurement

We present a Kπ mass spectrum analysis of the four-body semileptonic charm decay D+ → K−π+μ+ν in the range of 0.65 GeV/c2 < mKπ < 1.5 GeV/c 2. We observe a non-resonant contribution of 5.30 ± 0.74 − 0.96% with respect to the total D+ → K−π+μ+ν decay. For the K∗(892)0 resonance, we obtain a mass of 895.41 ± 0.32 − 0.43 MeV/c 2, a width of 47.79 ± 0.86 − 1.06 MeV/c 2, and a BlattWeisskopf damping...

– 1 – Muon Decay Parameters

Introduction: All measurements in direct muon decay, μ − → e − + 2 neutrals, and its inverse, ν μ + e − → μ − + neutral, are successfully described by the " V-A interaction, " which is a particular case of a local, derivative-free, lepton-number-conserving, four-fermion interaction [1]. As shown below, within this framework, the Standard Model assumptions, such as the V-A form and the nature of...

0 v 3 2 5 M ar 1 99 8 Limits on ν μ ( ν e ) → ν τ oscillations and tau neutrino magnetic moment from neutrino - electron scattering