Measurement of the neutrino mixing angle θ₂₃ in NOvA

The NOvA Collaboration: P. Adamson , L. Aliaga , D. Ambrose , N. Anfimov , A. Antoshkin , E. Arrieta-Diaz , K. Augsten , A. Aurisano

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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. 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. M\'endez 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 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

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classification ✦ hep-ex

keywords mixingthetamaximalmeasurementneutrinonovaacceleratorangle

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This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of $6.05\times10^{20}$ protons-on-target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal mixing ($\theta_{23} = \pi/4$). Assuming the normal mass hierarchy, we find $\Delta m^2 = (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and $\sin^2 \theta_{23}$ at the two statistically degenerate values $0.404^{+0.030}_{-0.022}$ and $0.624^{+0.022}_{-0.030}$, both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 $\sigma$ significance.

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Short-range correlations in nuclei
nucl-ex 2026-05 unverdicted novelty 2.0

Short-range correlated pairs account for roughly 20% of nucleons in any nucleus and nearly all high-momentum nucleons, originating from the nucleon-nucleon tensor force.