Journal Article

Measurements of $\\overline{\\nu}_{\\mu}$ and $\\overline{\\nu}_{\\mu} + \\nu_{\\mu}$ charged-current cross-sections without detected pions or protons on water and hydrocarbon at a mean anti-neutrino energy of 0.86 GeV

Cherdack, D., Nakamura, K., Pari, M., Tanaka, S., Densham, C., Kudenko, Y., Tajima, M., Vilela, C., Andreopoulos, C., Bonus, T., Bench, F., Kikutani, H., Kasetti, S. P., Fujita, R., Sgalaberna, D., Mefodiev, A., Bronner, C., Radics, B., Cao, S., Kaboth, A. C., Yoshida, T., Cook, L., Nakajima, Y., Izumi, N., Ban, S., Ruggles, C., Valder, S., Finch, A. J., Sobczyk, J. T., De Rosa, G., Paolone, V., Wendell, R., Fusshoeller, K., Lagoda, J., Awataguchi, Y., Fernandez, P., Sobel, H., Berardi, V., O’Sullivan, L., Ereditato, A., Towstego, T., Morrison, J., Yasutome, K., Mineev, O., Wang, Y., Kim, H., King, S., Ruggeri, A. C., Brailsford, D., Tanaka, H. K., Walker, J., Payne, D., Schloesser, C. M., Lu, X., Maruyama, T., Vinning, W. S., Eguchi, A., Suzuki, S. Y., Walsh, J. G., Beloshapkin, A., Francois, C., Kajita, T., Machado, L. N., Suzuki, A., Tani, M., Berns, L., Kakuno, H., Murphy, S., Nantais, C., Kearns, E., Radicioni, E., Parsa, S., Wood, K., Last, D., Nova, F., Oyama, Y., Karlen, D., Kormos, L. L., Sekiguchi, T., Ali, A., Jesús-Valls, C., Tanihara, Y., Yang, G., Liu, S. L., Bolognesi, S., Thompson, L. F., Oser, S. M., Holeczek, J., Bravo Berguño, D., Arihara, T

2021

Overview

We report measurements of the flux-integrated $\\overline{\\nu}_\\mu$ and $\\overline{\\nu}_\\mu+\\nu_\\mu$ charged-current cross-sections 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 charged-current interaction with one induced $\\mu^\\pm$ and no detected charged pion or 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, $p_{\\mu}>400~{\\rm MeV}/c$ and $\\theta_{\\mu}<30^{\\circ}$, in the laboratory frame. An absence of pions and protons in the detectable phase spaces of $p_{\\pi}>200~{\\rm MeV}/c$, $\\theta_{\\pi}<70^{\\circ}$ and $p_{\\rm p}>600~{\\rm MeV}/c$, $\\theta_{\\rm p}<70^{\\circ}$ is required. In this paper, both the $\\overline{\\nu}_\\mu$ cross-sections and $\\overline{\\nu}_\\mu+\\nu_\\mu$ cross-sections on water and hydrocarbon targets and their ratios are provided by using the D’Agostini unfolding method. The results of the integrated $\\overline{\\nu}_\\mu$ cross-section measurements over this phase space are $\\sigma_{\\rm H_{2}O}=(1.082\\pm0.068(\\rm stat.)^{+0.145}_{-0.128}(\\rm syst.)) \\times 10^{-39}\\,{\\rm cm^{2} / nucleon}$, $\\sigma_{\\rm CH}=(1.096\\pm0.054(\\rm stat.)^{+0.132}_{-0.117}(\\rm syst.)) \\times 10^{-39}\\,{\\rm cm^{2} / nucleon}$, and $\\sigma_{\\rm H_{2}O}/\\sigma_{\\rm CH} = 0.987\\pm0.078(\\rm stat.)^{+0.093}_{-0.090}(\\rm syst.)$. The $\\overline{\\nu}_\\mu+\\nu_\\mu$ cross-section is $\\sigma_{\\rm H_{2}O} = (1.155\\pm0.064(\\rm stat.)^{+0.148}_{-0.129}(\\rm syst.)) \\times 10^{-39}\\,{\\rm cm^{2} / nucleon}$, $\\sigma_{\\rm CH}=(1.159\\pm0.049(\\rm stat.)^{+0.129}_{-0.115}(\\rm syst.)) \\times 10^{-39}\\,{\\rm cm^{2} / nucleon}$, and $\\sigma_{\\rm H_{2}O}/\\sigma_{\\rm CH}=0.996\\pm0.069(\\rm stat.)^{+0.083}_{-0.078}(\\rm syst.)$.

• Publisher: Physical Society of Japan
• Subject: C04 Neutrino masses mixing, and oscillations / C32 Experiments using neutrino beams