Sasha Mikheyev

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We present results for nu(mu) oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced nu(mu) beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of nu(mu), which we presume have oscillated to nu(tau). The probability that(More)
We report results from the first search for ν_{μ}→ν_{e} transitions by the NOvA experiment. In an exposure equivalent to 2.74×10^{20} protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of 0.99±0.11(syst) events based on the Near Detector measurement. A secondary analysis(More)
This paper reports the first measurement using the NOvA detectors of ν μ disappearance in a ν μ beam. The analysis uses a 14 kton-equivalent exposure of 2.74 × 10 20 protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure Δm 2 32 ¼ ð2.52 þ0.20 −0.18 Þ × 10 −3 eV 2 and sin 2 θ 23 in the range 0.38–0.65, both at(More)
We describe two independent methods to calculate the angular distribution of muons after traversing a thick scatterer due to multiple Coulomb scattering. Both methods take into account the nuclear size effect. We demonstrate a necessity to account for the nucleus extension as well as incoherent scattering on atomic electrons to describe the muon scattering(More)
The Baikal Neutrino Telescope has been operating in its NT200 configuration since April, 1998. The telescope has been upgraded in April, 2005 to the 10 Mton scale detector NT200+. It's main physics goal is the detection of signals from high energy neutrino cascades. NT200+ reaches a 3-year sensitivity of 2 × 10 −7 cm −2 s −1 sr −1 GeV for an all-flavor(More)
We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed, and an upper limit of is set on the cross(More)
Long length vacuum oscillations solution of the solar neutrino problem is discussed. We show that there is a strict correlation between a distortion of the neutrino energy spectrum and an amplitude of seasonal variations of the neutrino flux. The slope parameter which characterizes a distortion of the recoil electron energy spectrum in the Super-Kamiokande(More)
Citation Mariani, C. et al. " Measurement of inclusive ^{0} production in the charged-current interactions of neutrinos in a 1.3-GeV wide band beam. " Physical Review D 83, 054023 (2011): n. pag. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
We consider a solution of the atmospheric neutrino problem based on oscillations of muon neutrinos to sterile neutrinos: ν µ ↔ ν s. The zenith angle (Θ) dependences of the neutrino and upward-going muon fluxes in presence of these oscillations are studied. The dependences have characteristic form with two dips: at cos Θ = −0.6 ÷ −0.2 and cos Θ = −1.0 ÷(More)