First measurement of muon-neutrino disappearance in NOvA

Creators: Adamson, P.; Backhouse, C.; Bays, K.; Howcroft, C.; Lozier, J.; Michael, D.; Mualem, L.; Newman, H. B.; Patterson, R. B.; Pershey, D.; Trevor, J.; NOνA Collaboration

Abstract

This paper reports the first measurement using the NOvA detectors of ν_μ disappearance in a ν_μ beam. The analysis uses a 14 kton-equivalent exposure of 2.74×10^(20) protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure Δm^2_(32) =(2.52^(+0.20)_(−0.18))×10^(−3) eV^2 and sin^2 θ_(23) in the range 0.38–0.65, both at the 68% confidence level, with two statistically degenerate best-fit points at sin^2 θ_(23) =0.43 and 0.60. Results for the inverted mass hierarchy are also presented.

Additional Information

© 2016 American Physical Society. Received 19 January 2016; published 25 March 2016. This work was supported by the U.S. Department of Energy (DOE); the U.S. National Science Foundation; the Department of Science and Technology, India; the European Research Council; the MSMT CR, Czech Republic; the RAS, RMES, and RFBR, Russia; CNPq and FAPEG, Brazil; and the State and University of Minnesota. We are grateful for the contributions of the staffs of the University of Minnesota module assembly facility and NOvA FD Laboratory, Argonne National Laboratory, and Fermilab. Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02- 07CH11359 with the U.S. DOE.

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Published - PhysRevD.93.051104.pdf

Submitted - 1601.05037v2.pdf

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