Measurements of ν̅ μ and ν̅ μ + ν μ charged-current cross-sections without detected pions or protons on water and hydrocarbon at a mean anti-neutrino energy of 0.86 GeV

Abstract

We report measurements of the flux-integrated ν̄μ and ν̄μ + νμ charged-current crosssections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean beam energy of 0.86 GeV. The signal is defined as the (anti-) neutrino chargedcurrent interaction with one induced μ} and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, pμ > 400 MeV/c and θμ < 30◦, in the laboratory frame. Absence of pions and protons in the detectable phase space of “pπ > 200 MeV/c and θπ < 70◦”, and “pp > 600 MeV/c and θp < 70◦” is required. In this paper, both of the ν̄μ cross-sections and ν̄μ + νμ cross-sections on water and hydrocarbon targets, and their ratios are provided by using the D’Agostini unfolding method. The results of the integrated ν̄μ cross-section measurements over this phase space are σH2O = (1.082 ± 0.068(stat.)+0.145 −0.128(syst.)) × 10−39 cm2/nucleon, σCH = (1.096 ± 0.054(stat.)+0.132 −0.117(syst.)) × 10−39 cm2/nucleon, and σH2O/σCH = 0.987 ± 0.078(stat.)+0.093 −0.090(syst.). The ν̄μ + νμ cross-section is σH2O = (1.155 ± 0.064(stat.)+0.148 −0.129(syst.)) × 10−39 cm2/nucleon, σCH = (1.159 ± 0.049(stat.) +0.129 −0.115(syst.)) × 10−39 cm2/nucleon, and σH2O/σCH = 0.996 ± 0.069(stat.)+0.083 −0.078(syst.).

Status and perspectives of neutrino physics

“…Figure 6 shows the NuMI [32] beamline at Fermilab. Figure 7 illustrates the composition of the pion-dominated low-energy T2K [33] antineutrino and the high-energy TeV II [34] neutrino beams created, respectively, by 30 and 800 GeV protons at J-PARC and Fermilab. In the TeV II beam a lower energy peak around 70 GeV due to pion decay is present.…”

“…This technique with low energy pion beams has been used to generate 30 MeV muon neutrinos by the LSND experiment at Los Alamos (LANSCE), KARMEN at ISIS (RAL) and at the SNS at Oakridge. Kaon DAR production of neutrinos was recently demonstrated [37] by parasitic use of the NuMI beam dump and the MiniBooNE detector located on the surface [33] (left) and high energy (800 GeV protons) TeV II neutrino beam [34] at Fermilab (right, the relative contribution to the flux is indicated).…”

Neutrinos from Stored Muons (nuSTORM)

“…Measurements of neutrino interaction cross-sections on various target nuclei has been a significant experimental focus in the last 10-15 years of neutrino physics as their importance to the systematics budget of the long baseline neutrino oscillation experiments became clear. In recent years the T2K experiment has produced data on ν µ and ν e interactions on scintillator at an average neutrino energy of 600 MeV [57][58][59], and the MINERνA [32,40,60,61] experiment has produced similar data but at average neutrino energies of 3 GeV and on a variety of target nuclei. The results of both experiments show that, although the primary lepton kinematics are reasonably well predicted by our models, the hadronic multiplicities, identities and kinematics are still poorly described.…”

Design and performance of a scintillation tracker for track matching in nuclear-emulsion-based neutrino interaction measurement

“…This scintillator bar is of the same type as the one used in the WAGASCI detector in the T2K experiment [17,18]. It is primarily composed of polystyrene and infused with PPO and POPOP, and the mean light yield for the minimum ionizing particle is measured to be more than 10 p.e.…”