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Improved Measurement of Muon Antineutrino Disappearance in MINOS
Adamson, P. Bock, G. J. Boehnlein, D. J. Kordosky, M. Mathis, M. Nelson, J. K. Vahle, P. Walding, J. J.
Adamson, P.
Bock, G. J.
Boehnlein, D. J.
Kordosky, M.
Mathis, M.
Nelson, J. K.
Vahle, P.
Walding, J. J.
Abstract
We report an improved measurement of (nu) over bar (mu) disappearance over a distance of 735 km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a (nu) over bar (mu)-enhanced configuration. From a total exposure of 2.95 x 10(20) protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of Delta(m) over bar (2) = [2.62(-0.28)(+0.31)(stat) +/- 0.09(syst)] x 10(-3) eV(2) and constrain the (nu) over bar (mu) mixing angle sin(2)(2 (theta) over bar) > 0.75 (90% C.L.). These values are in agreement with Delta m(2) and sin(2)(2 theta) measured for nu(mu), removing the tension reported in [P. Adamson et al. (MINOS), Phys. Rev. Lett. 107, 021801 (2011).].
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2012-01-01
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Physics
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https://doi.org/10.1103/PhysRevLett.108.191801