/ 02 09 04 5 v 1 1 8 Se p 20 02 1 A Measurement of the τ − → μ − ν̄ μ ν τ Branching Ratio

ar X iv : h ep - p h / 98 09 55 5 v 1 2 7 Se p 19 98 Radiative B c → τ ν̄ τ γ decay

The radiative Bc → τ ν̄τγ decay is analyzed in the standard model. The branching ratio of this decay is calculated and the contributions of the Bremstrahlung and structure dependent parts are compared. It is shown that this decay can be detected at LHC. PACS number(s): 13.25.Gv, 13.20.–v, 13.10.+q electronic adress: [email protected] electronic adress: [email protected]

ep - e x / 05 09 04 5 v 1 2 9 Se p 20 05 Measurement of the Absolute Branching Ratio for the K + → μ + ν ( γ ) Decay with the KLOE Detector

We have measured the fully inclusive K+ → μ+ν(γ) absolute branching ratio with the KLOE experiment at DAΦNE, the Frascati φ–factory. From some 865,283 K+ → μ+ν(γ) decays obtained from a sample of ∼5.2 × 108 φ-meson decays, we find BR(K+ → μνμ(γ))=0.6366±0.0009stat.±0.0015syst., corresponding to an overall fractional error of 0.27%. Using recent lattice results on the decay constants of pseudosc...

Nonexistence of Homoclinic Solutions for a Class of Discrete Hamiltonian Systems

and Applied Analysis 3 From (A0), (17), (19), (20), and the first equation of system (6), we have x (n+1) = n ∑ τ=−∞ β (τ) 󵄨󵄨󵄨󵄨y (τ) 󵄨󵄨󵄨󵄨 μ−2 y (τ) n ∏ s=τ [1−α (s)] −1 , ∀n∈Z, (21) x (n+1) =− +∞ ∑ τ=n+1 β (τ) 󵄨󵄨󵄨󵄨y (τ) 󵄨󵄨󵄨󵄨 μ−2 y (τ) τ−1 ∏ s=n+1 [1−α (s)] , ∀n∈Z. (22) Combining (19) with (21), one has |x (n + 1)| ν = 󵄨󵄨󵄨󵄨󵄨󵄨󵄨 n ∑ τ=−∞ β (τ) 󵄨󵄨󵄨󵄨y (τ) 󵄨󵄨󵄨󵄨 μ−2 y (τ) n ∏ s=τ [1 − α (s)] −1 󵄨󵄨󵄨󵄨󵄨󵄨...

02 01 1 v 2 1 4 A pr 1 99 8 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.

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