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arXiv · 1202.2772

An improved measurement of muon antineutrino disappearance in MINOS

P. Adamson·D. S. Ayres·C. Backhouse·G. Barr·M. Bishai·A. Blake·G. J. Bock·D. J. Boehnlein·D. Bogert·S. V. Cao·S. Childress·J. A. B. Coelho·L. Corwin·D. Cronin-Hennessy·I. Z. Danko·J. K. de Jong·N. E. Devenish·M. V. Diwan·C. O. Escobar·J. J. Evans·E. Falk·G. J. Feldman·M. V. Frohne·H. R. Gallagher·R. A. Gomes·M. C. Goodman·P. Gouffon·N. Graf·R. Gran·K. Grzelak·A. Habig·J. Hartnell·R. Hatcher·A. Himmel·A. Holin·X. Huang·J. Hylen·G. M. Irwin·Z. Isvan·D. E. Jaffe·C. James·D. Jensen·T. Kafka·S. M. S. Kasahara·G. Koizumi·S. Kopp·M. Kordosky·A. Kreymer·K. Lang·J. Ling·P. J. Litchfield·L. Loiacono·P. Lucas·W. A. Mann·M. L. Marshak·M. Mathis·N. Mayer·R. Mehdiyev·J. R. Meier·M. D. Messier·D. G. Michael·W. H. Miller·S. R. Mishra·J. Mitchell·C. D. Moore·L. Mualem·S. Mufson·J. Musser·D. Naples·J. K. Nelson·H. B. Newman·R. J. Nichol·J. A. Nowak·W. P. Oliver·M. Orchanian·R. B. Pahlka·J. Paley·R. B. Patterson·G. Pawloski·S. Phan-Budd·R. K. Plunkett·X. Qiu·A. Radovic·J. Ratchford·B. Rebel·C. Rosenfeld·H. A. Rubin·M. C. Sanchez·J. Schneps·A. Schreckenberger·P. Schreiner·R. Sharma·A. Sousa·M. Strait·N. Tagg·R. L. Talaga·J. Thomas·M. A. Thomson·G. Tinti·R. Toner
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Abstract

We report an improved measurement of muon anti-neutrino disappearance over a distance of 735km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a muon anti-neutrino enhanced configuration. From a total exposure of 2.95e20 protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of the anti-neutrino "atmospheric" delta-m squared = 2.62 +0.31/-0.28 (stat.) +/- 0.09 (syst.) and constrain the anti-neutrino atmospheric mixing angle >0.75 (90%CL). These values are in agreement with those measured for muon neutrinos, removing the tension reported previously.

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P. Adamson, D. S. Ayres, C. Backhouse, G. Barr, M. Bishai, A. Blake, G. J. Bock, D. J. Boehnlein, D. Bogert, S. V. Cao, S. Childress, J. A. B. Coelho, L. Corwin, D. Cronin-Hennessy, I. Z. Danko, J. K. de Jong, N. E. Devenish, M. V. Diwan, C. O. Escobar, J. J. Evans, E. Falk, G. J. Feldman, M. V. Frohne, H. R. Gallagher, R. A. Gomes, M. C. Goodman, P. Gouffon, N. Graf, R. Gran, K. Grzelak, A. Habig, J. Hartnell, R. Hatcher, A. Himmel, A. Holin, X. Huang, J. Hylen, G. M. Irwin, Z. Isvan, D. E. Jaffe, C. James, D. Jensen, T. Kafka, S. M. S. Kasahara, G. Koizumi, S. Kopp, M. Kordosky, A. Kreymer, K. Lang, J. Ling, P. J. Litchfield, L. Loiacono, P. Lucas, W. A. Mann, M. L. Marshak, M. Mathis, N. Mayer, R. Mehdiyev, J. R. Meier, M. D. Messier, D. G. Michael, W. H. Miller, S. R. Mishra, J. Mitchell, C. D. Moore, L. Mualem, S. Mufson, J. Musser, D. Naples, J. K. Nelson, H. B. Newman, R. J. Nichol, J. A. Nowak, W. P. Oliver, M. Orchanian, R. B. Pahlka, J. Paley, R. B. Patterson, G. Pawloski, S. Phan-Budd, R. K. Plunkett, X. Qiu, A. Radovic, J. Ratchford, B. Rebel, C. Rosenfeld, H. A. Rubin, M. C. Sanchez, J. Schneps, A. Schreckenberger, P. Schreiner, R. Sharma, A. Sousa, M. Strait, N. Tagg, R. L. Talaga, J. Thomas, M. A. Thomson, G. Tinti, R. Toner. 2012-02-13. An improved measurement of muon antineutrino disappearance in MINOS. https://doi.org/10.1103/physrevlett.108.191801

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