MINOS Document 4752-v1

An Atmospheric Muon Neutrino Disappearance Measurement with the MINOS Far Detector

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Marvin L Marshak
Updated by:
Marvin L Marshak
Document Created:
13 Jun 2008, 10:31
Contents Revised:
13 Jun 2008, 10:31
Metadata Revised:
16 Jan 2009, 16:39
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It is now widely accepted that the Standard Model assumption of massless neutrinos is wrong, due primarily to the observation of solar and atmospheric neutrino flavor oscillations by a small number of convincing experiments. The MINOS Far Detector, capable of observing both the outgoing lepton and associated showering products of a neutrino interaction, provides an excellent opportunity to independently search for an oscillation signature in atmospheric neutrinos. To this end, a MINOS data set from an 883 live day, 13.1 kt-yr exposure collected between July, 2003 and April, 2007 has been analyzed. 105 candidate charged current muon neutrino interactions were
observed, with 120.5 ± 1.3 (statistical error only) expected in the absence of oscillation. A maximum likelihood analysis of the observed log(L/E) spectrum shows that the null oscillation hypothesis is excluded at over 96% confidence and that the best fit oscillation parameters are sin2 2θ23 = 0.95
−0.32 and (∆m 2 23 = 0.93+3.94 −0.44) × 10− 3 eV2 . This measurement of oscillation parameters is consistent with the best fit values from the Super-Kamiokande experiment at 68% confidence.
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