17 research outputs found

    A method for detecting ντ\nu_\tau appearance in the spectra of quasielastic CC events

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    A method for detecting the transition \omutau in long-baseline accelerator experiments, that consists in comparing the far-to-near ratios of the spectra of quasielastic CC events generated by high- and low-energy beams of muon neutrinos, is proposed. The test may be accessible to big water Cherenkov detectors and iron--scintillator calorimeters, and is limited by statistics rather than systematics.Comment: 10 pages, 4 figure

    Emulsion Chamber with Big Radiation Length for Detecting Neutrino Oscillations

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    A conceptual scheme of a hybrid-emulsion spectrometer for investigating various channels of neutrino oscillations is proposed. The design emphasizes detection of τ\tau leptons by detached vertices, reliable identification of electrons, and good spectrometry for all charged particles and photons. A distributed target is formed by layers of low-Z material, emulsion-plastic-emulsion sheets, and air gaps in which τ\tau decays are detected. The tracks of charged secondaries, including electrons, are momentum-analyzed by curvature in magnetic field using hits in successive thin layers of emulsion. The τ\tau leptons are efficiently detected in all major decay channels, including \xedec. Performance of a model spectrometer, that contains 3 tons of nuclear emulsion and 20 tons of passive material, is estimated for different experimental environments. When irradiated by the νμ\nu_\mu beam of a proton accelerator over a medium baseline of 1 \sim 1 km/GeV, the spectrometer will efficiently detect either the \omutau and \omue transitions in the mass-difference region of Δm21\Delta m^2 \sim 1 eV2^2, as suggested by the results of LSND. When exposed to the neutrino beam of a muon storage ring over a long baseline of \sim 10-20 km/GeV, the model detector will efficiently probe the entire pattern of neutrino oscillations in the region Δm2102103\Delta m^2 \sim 10^{-2}-10^{-3} eV2^2, as suggested by the data on atmospheric neutrinos.Comment: 34 pages, 8 figure

    Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

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    Spark chamber use in high-energy physics

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    A Study of Antineutrino Interactions in the NAL 15-FT Bubble Chamber, Filled wit Hydrogen and Neon

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    A study of antineutrino interactions in the 15-ft bubble chamber filled with a neon-hydrogen mixture is proposed. This mixture provides good detection efficiency for a neutral component and lepton identification. We request a total flux of {approx} 10{sup 19} interacting protons at the highest available energy for the proposed program. Our program includes the measurement of total cross sections of antineutrino interactions, inclusive and exclusive reactions, which can be described by either charged or neutral currents, pure lepton interactions and searches for new particles and new phenomena. As a first step, we ask for 200,000 photographs at the earliest possible date with a mixture of the order of 30 atomic percent neon in the bubble chamber

    Spin alignment and parity violation effects in ρ0 production in neutrino and antineutrino charged-current interactions

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    Most of the measured events on hydrogen, deuterium and neon targets from BEBC at CERN and the 15-foot Bubble Chamber at Fermilab are combined to measure spin-density matrix elements for ρ0 production in the current-fragmentation region in neutrino and antineutrino charged-current interactions. The spin-alignment parameter η is found to be 0.08±0.11 for neutrino and 0.41±0.11 for antineutrino interactions. The parity-odd density matrix element Im(ρ10+ρ-10) is consistent with zero in both reactions. In the combined neutrino and antineutrino data an indication of parity violation is observed: Im ρ1-1=0.38±0.16 at xB>0.2, Q2>8 GeV2 and z>0.6. © 1995 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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