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arxiv: 1906.04907 · v2 · pith:G5QOJD5Snew · submitted 2019-06-12 · ✦ hep-ex

First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA

M. A. Acero , P. Adamson , L. Aliaga , T. Alion , V. Allakhverdian , S. Altakarli , N. Anfimov , A. Antoshkin
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A. Aurisano A. Back C. Backhouse M. Baird N. Balashov P. Baldi B. A. Bambah S. Bashar K. Bays S. Bending R. Bernstein V. Bhatnagar B. Bhuyan J. Bian T. Blackburn J. Blair A. C. Booth P. Bour C. Bromberg N. Buchanan A. Butkevich S. Calvez M. Campbell T. J. Carroll E. Catano-Mur A. Cedeno S. Childress B. C. Choudhary B. Chowdhury T. E. Coan M. Colo J. Cooper L. Corwin L. Cremonesi G. S. Davies P. F. Derwent P. Ding Z. Djurcic D. Doyle E. C. Dukes H. Duyang S. Edayath R. Ehrlich M. Elkins G. J. Feldman P. Filip W. Flanagan M. J. Frank H. R. Gallagher R. Gandrajula F. Gao S. Germani A. Giri R. A. Gomes M. C. Goodman V. Grichine M. Groh R. Group B. Guo A. Habig F. Hakl J. Hartnell R. Hatcher A. Hatzikoutelis K. Heller V Hewes A. Himmel A. Holin B. Howard J. Huang J. Hylen F. Jediny C. Johnson M. Judah I. Kakorin D. Kalra D. M. Kaplan R. Keloth O. Klimov L. W. Koerner L. Kolupaeva S. Kotelnikov A. Kreymer Ch. Kulenberg A. Kumar C. D. Kuruppu V. Kus T. Lackey K. Lang S. Lin M. Lokajicek J. Lozier S. Luchuk K. Maan S. Magill W. A. Mann M. L. Marshak M. Martinez-Casales V. Matveev D. P. Mendez M. D. Messier H. Meyer T. Miao W. H. Miller S. R. Mishra A. Mislivec R. Mohanta A. Moren L. Mualem M. Muether S. Mufson K. Mulder R. Murphy J. Musser D. Naples N. Nayak J. K. Nelson R. Nichol G. Nikseresht E. Niner A. Norman T. Nosek A. Olshevskiy T. Olson J. Paley R. B. Patterson G. Pawloski D. Pershey O. Petrova R. Petti D. D. Phan R. K. Plunkett B. Potukuchi C. Principato F. Psihas A. Radovic V. Raj R. A. Rameika B. Rebel P. Rojas V. Ryabov O. Samoylov M. C. Sanchez S. Sanchez Falero I. S. Seong P. Shanahan A. Sheshukov P. Singh V. Singh E. Smith J. Smolik P. Snopok N. Solomey E. Song A. Sousa K. Soustruznik M. Strait L. Suter A. Sutton R. L. Talaga B. Tapia Oregui P. Tas R. B. Thayyullathil J. Thomas E. Tiras D. Torbunov J. Tripathi A. Tsaris Y. Torun J. Urheim P. Vahle J. Vasel L. Vinton P. Vokac T. Vrba M. Wallbank B. Wang T. K. Warburton M. Wetstein M. While D. Whittington S. G. Wojcicki J. Wolcott N. Yadav A. Yallappa Dombara K. Yonehara S. Yu S. Zadorozhnyy J. Zalesak B. Zamorano R. Zwaska (NOvA Collaboration)
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The NOvA experiment has made a $4.4\sigma$-significant observation of $\bar\nu_{e}$ appearance in a 2 GeV $\bar\nu_{\mu}$ beam at a distance of 810 km. Using $12.33\times10^{20}$ protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 $\bar\nu_{\mu} \rightarrow \bar\nu_{e}$ candidates with a background of 10.3 and 102 $\bar\nu_{\mu} \rightarrow \bar\nu_{\mu}$ candidates. This new antineutrino data is combined with neutrino data to measure the oscillation parameters $|\Delta m^2_{32}| = 2.48^{+0.11}_{-0.06}\times10^{-3}$ eV$^2/c^4$, $\sin^2 \theta_{23} = 0.56^{+0.04}_{-0.03}$ in the normal neutrino mass hierarchy and upper octant and excludes most values near $\delta_{\rm CP}=\pi/2$ for the inverted mass hierarchy by more than 3$\sigma$. The data favor the normal neutrino mass hierarchy by 1.9$\sigma$ and $\theta_{23}$ values in the upper octant by 1.6$\sigma$.

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