Measurements of $\barν_μ$ and $\barν_μ + ν_μ$
charged-current cross-sections without detected pions nor protons on water
and hydrocarbon at mean antineutrino energy of 0.86 GeV
Prog Theor Exp Phys (2021)
Authors:
K Abe, N Akhlaq, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, T Arihara, Y Asada, Y Ashida, Et Atkin, Y Awataguchi, S Ban, M Barbi, Gj Barker, G Barr, D Barrow, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, S Berkman, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, T Bonus, B Bourguille, Sb Boyd, D Brailsford, A Bravar, D Bravo Berguño, C Bronner, S Bron, A Bubak, M Buizza Avanzini, J Calcutt, T Campbell, S Cao, Sl Cartwright, Mg Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack
Abstract:
We report measurements of the flux-integrated $\bar{\nu}_\mu$ and
$\bar{\nu}_\mu+\nu_\mu$ charged-current cross-sections on water and hydrocarbon
targets using the T2K anti-neutrino beam, with a mean neutrino 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 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, $p_{\mu}>400~{\rm MeV}/c$
and $\theta_{\mu}<30^{\circ}$, in the laboratory frame. Absence of pions and
protons in the detectable phase space of "$p_{\pi}>200~{\rm MeV}/c$ and
$\theta_{\pi}<70^{\circ}$", and "$p_{\rm p}>600~{\rm MeV}/c$ and $\theta_{\rm
p}<70^{\circ}$" is required. In this paper, both of the $\bar{\nu}_\mu$
cross-sections and $\bar{\nu}_\mu+\nu_\mu$ cross-sections on water and
hydrocarbon targets, and their ratios are provided by using D'Agostini
unfolding method. The results of the integrated $\bar{\nu}_\mu$ 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 $\bar{\nu}_\mu+\nu_\mu$ 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 $\sigma_{\rm H_{2}O}/\sigma_{\rm
CH}\,=\,0.996\pm0.069(\rm stat.)^{+0.083}_{-0.078}(\rm syst.)$.
