Measurement of the Neutrino Mixing Angle θ_{23} in NOvA. P Adamson , L Aliaga , D Ambrose , N Anfimov , A Antoshkin , E Arrieta-Diaz , K Augsten , A Aurisano , C Backhouse , M Baird , B A Bambah , K Bays , B Behera , S Bending , R Bernstein , V Bhatnagar , B Bhuyan , J Bian , T Blackburn , A Bolshakova , C Bromberg , J Brown , G Brunetti , N Buchanan , A Butkevich , V Bychkov , M Campbell , E Catano-Mur , S Childress , B C Choudhary , B Chowdhury , T E Coan , J A B Coelho , M Colo , J Cooper , L Corwin , L Cremonesi , D Cronin-Hennessy , G S Davies , J P Davies , P F Derwent , S Desai , R Dharmapalan , P Ding , Z Djurcic , E C Dukes , H Duyang , S Edayath , R Ehrlich , G J Feldman , M J Frank , M Gabrielyan , H R Gallagher , S Germani , T Ghosh , A Giri , R A Gomes , M C Goodman , V Grichine , R Group , D Grover , B Guo , A Habig , J Hartnell , R Hatcher , A Hatzikoutelis , K Heller , A Himmel , A Holin , J Hylen , F Jediny , M Judah , G K Kafka , D Kalra , S M S Kasahara , S Kasetti , R Keloth , L Kolupaeva , S Kotelnikov , I Kourbanis , A Kreymer , A Kumar , S Kurbanov , K Lang , W M Lee , S Lin , J Liu , M Lokajicek , J Lozier , S Luchuk , K Maan , S Magill , W A Mann , M L Marshak , K Matera , V Matveev , D P Méndez , M D Messier , H Meyer , T Miao , W H Miller , S R Mishra , R Mohanta , A Moren , L Mualem , M Muether , S Mufson , R Murphy , J Musser , J K Nelson , R Nichol , E Niner , A Norman , T Nosek , Y Oksuzian , A Olshevskiy , T Olson , J Paley , P Pandey , R B Patterson , G Pawloski , D Pershey , O Petrova , R Petti , S Phan-Budd , R K Plunkett , R Poling , B Potukuchi , C Principato , F Psihas , A Radovic , R A Rameika , B Rebel , B Reed , D Rocco , P Rojas , V Ryabov , K Sachdev , P Sail , O Samoylov , M C Sanchez , R Schroeter , J Sepulveda-Quiroz , P Shanahan , A Sheshukov , J Singh , J Singh , P Singh , V Singh , J Smolik , N Solomey , E Song , A Sousa , K Soustruznik , M Strait , L Suter , R L Talaga , M C Tamsett , P Tas , R B Thayyullathil , J Thomas , X Tian , S C Tognini , J Tripathi , A Tsaris , J Urheim , P Vahle , J Vasel , L Vinton , A Vold , T Vrba , B Wang , M Wetstein , D Whittington , S G Wojcicki , J Wolcott , N Yadav , S Yang , J Zalesak , B Zamorano , R Zwaska PHYSICAL REVIEW LETTERS（2017）
摘要
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05 x 10(20) protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal theta(23) mixing (theta(23) = pi/4). Assuming the normal mass hierarchy, we find Delta m(32)(2) = (2.67 +/- 0.11) x 10(-3) eV(2) and sin(2) theta(23)at the two statistically degenerate values 0.404(-0.022)(+0.030) and 0.624(-0.030)(+0.022), both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 sigma significance.
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