V. A. Lebedev

Search for Heavy Neutrino in

Heavy neutrino nu_h with m_h mu nu_h (nu_h -> nu gamma) decay chain in the following parameter region: 30MeV/c^2 < m_h < 80MeV/c^2; 10^{-11}sec < tau_h < 10^{-9}sec. For the whole region |U_{mu h}|^2 < 5 x 10^{-5} for Majorana type of nu_h and | U_{\mu h}|^2 < 8 x 10^{-5} for the Dirac case.

K^- -> \mu^- \nu_h(\nu_h -> \nu \gamma)

Heavy neutrino nu_h with m_h mu nu_h (nu_h -> nu gamma) decay chain in the following parameter region: 30MeV/c^2 < m_h < 80MeV/c^2; 10^{-11}sec < tau_h < 10^{-9}sec. For the whole region |U_{mu h}|^2 < 5 x 10^{-5} for Majorana type of nu_h and | U_{\mu h}|^2 < 8 x 10^{-5} for the Dirac case.

Decay at ISTRA+ Setup

The decay K− → μ−νπ0 has been studied using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV negative secondary beam of the U-70 PS. About 112K events were used for the analysis. The λ+ and λ0 slope parameters of the decay form factors f+(t) and f0(t) have been measured: λ+=0.0321±0.004(stat.)±0.002(syst.), λ0=0.0209±0.004(stat.)±0.002(syst.); the correlation dλ0/dλ+=−0.46. The limits on the possible tensor and scalar couplings have been derived: fT/f+(0)=−0.021±0.028(stat.)±0.014(theor.), fS/f+(0)=0.004±0.005(stat.)±0.005(theor.).

Search for heavy neutrino in K−→μ−νh(νh→νγ) decay at ISTRA+ setup

AbstractResults of study of the

Study of \(K^ - \to \pi ^0 e^ - \overline \nu _e \gamma \) decay with ISTRA+ setup

K^ - \to \pi ^0 e^ - \overline \nu \gamma

Search for the KL0 → π0ν\tilde v decay at the INEP U-70 accelerator: The KLOD project

decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be

Extraction of Kaon Formfactors from K->mu nu gamma Decay at ISTRA+ Setup

R = \frac{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e \gamma )}}{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e )}}