Abstract
This paper presents the first combined measurement of the double-differential muon neutrino and antineutrino charged-current cross sections with no pions in the final state on hydrocarbon at the off-axis near detector of the T2K experiment. The data analyzed in this work comprise 5.8×1020 and 6.3×1020 protons on target in neutrino and antineutrino mode respectively, at a beam energy peak of 0.6 GeV. Using the two measured cross sections, the sum, difference, and asymmetry were calculated with the aim of better understanding the nuclear effects involved in such interactions. The extracted measurements have been compared with the prediction from different Monte Carlo generators and theoretical models showing that the difference between the two cross sections have interesting sensitivity to nuclear effects.27 MoreReceived 26 February 2020Accepted 5 May 2020DOI:https://doi.org/10.1103/PhysRevD.101.112001Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNeutrino interactionsParticles & Fields
Highlights
Current and future long-baseline neutrino oscillation experiments have as primary goals the measurements of the charge-parity (CP) violating phase, the neutrino mass ordering and the octant determination of the mixing angle θ23 [1,2,3,4]
CC-0π and CC-0π are the number of neutrino and antineutrino CC-0π events respectively evaluated by the fit, ενi μ and εiνμ are the efficiency evaluated from Monte Carlo (MC), NFnuVcleons is the number of target nucleons in the fiducial volume, Φνμ and Φνμ are the integrated fluxes for neutrino and antineutrino, Δpμ and Δ cos θμ are the bin widths of the muon momentum and cosine of the muon scattering angle with respect to the beam direction
It should be noted that, especially for the neutrino and antineutrino cross sections, as well as their sum, the overall normalization uncertainty constitutes a relatively large fraction of the uncertainty. In particular it contributes to 48% and 35% of the total systematic uncertainty for neutrino and antineutrino cross sections respectively and to 49% for the sum, while for the difference it decreases to 19% and for the asymmetry to 5%
Summary
Current and future long-baseline neutrino oscillation experiments have as primary goals the measurements of the charge-parity (CP) violating phase (δCP), the neutrino mass ordering and the octant determination of the mixing angle θ23 [1,2,3,4]. Studying differences between CCQE-like cross sections for neutrino and antineutrino interactions could provide information about the role of multinucleon knockout in (anti)neutrino-nucleus interactions. This paper reports the first combined measurement of the double differential neutrino and antineutrino charged current cross sections on hydrocarbon without pions in the final state This CCQE-like cross section will include contributions from CCQE events as well as events in which a pion was produced and reabsorbed by the nucleus and multinucleon knockout events. The neutrino-antineutrino cross section asymmetry, which is the ratio between the difference and the sum, is a crucial quantity to control in order to avoid biases in the search for CP violation in neutrino oscillation All these quantities have been compared with predictions made using several MC generators and models, which are discussed in this paper.
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