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; D. Torretta; G.; Tzanakos; J. Urheim; P. Vahle; B. Viren; J. J. Walding; A. Weber; R. C. Webb,; C. White; L. Whitehead; S. G. Wojcicki; R. Zwaska

arXiv:1202.2772·hep-ex·June 4, 2015

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

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TL;DR

This paper presents a more precise measurement of muon antineutrino disappearance over 735 km, confirming consistency with muon neutrino oscillation parameters and reducing previous discrepancies.

Contribution

It provides the most accurate measurement of muon antineutrino oscillation parameters using an expanded dataset from MINOS, improving previous results.

Findings

01

Measured delta-m squared = 2.62 +0.31/-0.28 (stat.) +/- 0.09 (syst.)

02

Constrained the atmospheric mixing angle >0.75 (90% CL)

03

Results agree with muon neutrino measurements

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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