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Combined sensitivity of T2K-II and noνa experiments to CP violation in lepton sector

In this paper, we study the combined sensitivity of T2K-II and NOvA, the world leading long-baseline neutrino oscillation experiments, to CP violation in lepton sector. By operating until the year 2026, T2K-II is expected to collect a total exposure of 20×1021 protons-on-target. Meanwhile, NOνA experiment has a plan to extend its run up to 2024 for accumulating totally an amount of 72 × 1020 protons-on-target. | Communications in Physics, Vol. 28, No. 4 (2018), pp. 337-349 DOI:10.15625/0868-3166/28/4/12930 COMBINED SENSITIVITY OF T2K-II AND NOνA EXPERIMENTS TO CP VIOLATION IN LEPTON SECTOR TRAN VAN NGOC1 , CAO VAN SON2 , AND NGUYEN THI HONG VAN1,3,† 1 Institute For Interdisciplinary Research in Science and Education (IFIRSE) Ghenh Rang, Quy Nhon, Vietnam 2 High Energy Accelerator Research Organization (KEK) Tsukuba, Ibaraki, Japan 3 Institute of Physics, Vietnam Academy of Science and Technology 10 Dao Tan, Ba Dinh, Hanoi, Vietnam † E-mail: nhvan@iop.vast.ac.vn Received 04 August 2018 Accepted for publication 21 September 2018 Published 15 December 2018 Abstract. In this paper, we study the combined sensitivity of T2K-II and NOvA, the world leading long-baseline neutrino oscillation experiments, to CP violation in lepton sector. By operating until the year 2026, T2K-II is expected to collect a total exposure of 20 × 1021 protons-on-target. Meanwhile, NOνA experiment has a plan to extend its run up to 2024 for accumulating totally an amount of 72 × 1020 protons-on-target. By combining analyses of T2K-II and NOνA with an ultimate constraint on θ13 from reactor, the sensitivity to CP violation is expected to exceed 4σ C.L. It is also pointed out that by reducing the systematic uncertainties of both T2K-II and NOνA to a level of 2%, the sensitivity to CP violation will significantly increase with a discovery possibility at 5σ C.L. significance for a particular range of true δCP . Keywords: CP violation, neutrinos, T2K experiment, NOvA experiment. Classification numbers: 14.60.Pq, 14.60.Pq, 25.30.Pt. I. INTRODUCTION The idea of neutrino oscillation, in which one type of neutrino can change into another, was raised for the first time by B. Pontecorvo in 1957 as neutrino-antineutrino transition [1]. It can explain the solar neutrino anomaly [2, 3] and the atmospheric neutrino anomaly [4]. The neutrino flavor oscillation was introduced later in 1962 by Z. Maki, M. Nakagawa and