Recent Results from the MINOS experiment


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

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