94 research outputs found

    Recent Results from the MINOS experiment

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    MINOS is an accelerator neutrino oscillation experiment at Fermilab. An intense high energy neutrino beam is produced at Fermilab and sent to a near detector on the Fermilab site and also to a 5 kTon far detector 735 km away in the Soudan mine in northern Minnesota. The experiment has now had several years of running with millions of events in the near detector and hundreds of events recorded in the far detector. I will report on the recent results from this experiment which include precise measurement of Δm322|\Delta m^2_{32}|, ~analysis of neutral current data to limit the component of sterile neutrinos, and the search for νμνe\nu_\mu \to \nu_e conversion. The focus will be on the analysis of data for νμνe\nu_\mu \to \nu_e conversion. Using data from an exposure of 3.14×10203.14\times 10^{20} protons on target, we have selected electron type events in both the near and the far detector. The near detector is used to measure the background which is extrapolated to the far detector. We have found 35 events in the signal region with a background expectation of 27±5(stat)±2(syst)27\pm 5(stat)\pm 2(syst). Using this observation we set a 90% C.L. limit of sin22θ13<0.29\sin^2 2 \theta_{13} < 0.29 for δcp=0\delta_{cp} = 0 and normal mass hierarchy. Further analysis is under way to reduce backgrounds and improve sensitivity.Comment: This was prepared for the proceedings of the XIII International Workshop on Neutrino Telescopes at the Istituto Veneto di Scienze, Lettere ed Arti in Venice, Italy held on March 10-13, 2009. The presentation was on behalf of the MINOS collaboratio

    Status of the MINOS experiment

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    I will present the status of the long baseline neutrino oscillation experiment MINOS at Fermi National Accelerator Laboratory (Fermilab). I will summarize the status of the detector and beam construction, the expected event rates and sensitivity to physics. I will also comment on possible future plans to improve the performance of the experiment.Comment: Invited talk at the Seventh International Workshop on Tau Lepton Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 7 pages, 6 figures, LaTeX Higher res figures at http://minos.phy.bnl.gov/~diwan/tau02_th08.p

    Forward production of prompt neutrinos from charm in the atmosphere and at high energy colliders

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    The high-energy atmospheric neutrino flux is dominated by neutrinos from the decays of charmed hadrons produced in the forward direction by cosmic ray interactions with air nuclei. We evaluate the charm contributions to the prompt atmospheric neutrino flux as a function of the center-of-mass energy s\sqrt{s} of the hadronic collision and of the center-of-mass rapidity yy of the produced charm hadron. Uncertainties associated with parton distribution functions are also evaluated as a function of yy. We find that the yy coverage of LHCb for forward heavy-flavour production, complemented by the angular coverage of present and future forward neutrino experiments at the LHC, bracket the most interesting yy regions for the prompt atmospheric neutrino flux. At s=14\sqrt{s}=14 TeV foreseen for the HL-LHC phase, nucleon collisions in air contribute to the prompt neutrino flux prominently below Eν107E_\nu\sim 10^7~GeV. Measurements of forward charm and/or forward neutrinos produced in hadron collisions up to s=100\sqrt{s}=100 TeV, which might become possible at the FCC, are relevant for the prompt atmospheric neutrino flux up to Eν=108E_\nu=10^8 GeV and beyond.Comment: 29 pages, 11 figure