This paper reports the first differential measurement of the charged-current \(\overline{\nu}_{\mu}\) interaction cross section on water with no pions in the final state. The unfolded flux-averaged ...measurement using the T2K off-axis near detector is given in double differential bins of \(\mu^+\) momentum and angle. The integrated cross section in a restricted phase space is \(\sigma=\left(1.11\pm0.18\right)\times10^{-38}\) cm\(^{2}\) per water molecule. Comparisons with several nuclear models are also presented.
We report a measurement of the flux-integrated \(\nu_{\mu}\) charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. ...The measured cross sections on water, hydrocarbon, and iron are \(\sigma^{\rm{H_{2}O}}_{\rm{CC}}\) = (0.840\(\pm 0.010\)(stat.)\(^{+0.10}_{-0.08}\)(syst.))\(\times\)10\(^{-38}\)cm\(^2\)/nucleon, \(\sigma^{\rm{CH}}_{\rm{CC}}\) = (0.817\(\pm 0.007\)(stat.)\(^{+0.11}_{-0.08}\)(syst.))\(\times\)10\(^{-38}\)cm\(^2\)/nucleon, and \(\sigma^{\rm{Fe}}_{\rm{CC}}\) = (0.859\(\pm 0.003\)(stat.) \(^{+0.12}_{-0.10}\)(syst.))\(\times\)10\(^{-38}\)cm\(^2\)/nucleon respectively, for a restricted phase space of induced muons: \(\theta_{\mu}<45^{\circ}\) and \(p_{\mu}>\)0.4 GeV/\(c\) in the laboratory frame. The measured cross section ratios are \({\sigma^{\rm{H_{2}O}}_{\rm{CC}}}/{\sigma^{\rm{CH}}_{\rm{CC}}}\) = 1.028\(\pm 0.016\)(stat.)\(\pm 0.053\)(syst.), \({\sigma^{\rm{Fe}}_{\rm{CC}}}/{\sigma^{\rm{H_{2}O}}_{\rm{CC}}}\) = 1.023\(\pm 0.012\)(stat.)\(\pm 0.058\)(syst.), and \({\sigma^{\rm{Fe}}_{\rm{CC}}}/{\sigma^{\rm{CH}}_{\rm{CC}}}\) = 1.049\(\pm 0.010\)(stat.)\(\pm 0.043\)(syst.). These results, with an unprecedented precision for the measurements of neutrino cross sections on water in the studied energy region, show good agreement with the current neutrino interaction models used in the T2K oscillation analyses.
MINERvA presents a new analysis of neutrino induced quasielastic-like interactions in a hydrocarbon tracking target. We report a double-differential cross section using the muon transverse and ...longitudinal momentum. In addition, differential cross sections as a function of the square of the four-momentum transferred and the neutrino energy are calculated using a quasielastic hypothesis. Finally, an analysis of energy deposited near the interaction vertex is presented. These results are compared to modified GENIE predictions as well as a NuWro prediction. All results use a dataset produced by \(3.34\times10^{20}\) protons on target creating a neutrino beam with a peak energy of approximately 3.5 GeV
The T2K experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and antineutrino beams. With an exposure of \(14.7(7.6)\times 10^{20}\) ...protons on target in neutrino (antineutrino) mode, 89 \(\nu_e\) candidates and 7 anti-\(\nu_e\) candidates were observed while 67.5 and 9.0 are expected for \(\delta_{CP}=0\) and normal mass ordering. The obtained \(2\sigma\) confidence interval for the \(CP\) violating phase, \(\delta_{CP}\), does not include the \(CP\)-conserving cases (\(\delta_{CP}=0,\pi\)). The best-fit values of other parameters are \(\sin^2\theta_{23} = 0.526^{+0.032}_{-0.036}\) and \(\Delta m^2_{32}=2.463^{+0.071}_{-0.070}\times10^{-3} \mathrm{eV}^2/c^4\).
This paper reports the first differential measurement of the charged-current interaction cross section of \(\nu_{\mu}\) on water with no pions in the final state. This flux-averaged measurement has ...been made using the T2K experiment's off-axis near detector, and is reported in doubly-differential bins of muon momentum and angle. The flux-averaged total cross section in a restricted region of phase space was found to be \( \sigma= (0.95 \pm 0.08 (\mbox{stat}) \pm 0.06 (\mbox{det. syst.}) \pm 0.04(\mbox{model syst.}) \pm{} 0.08(\mbox{flux}) ) \times 10^{-38} \mbox{cm}^2\) per n.
We report a measurement of the flux-integrated cross section for inclusive muon neutrino charged-current interactions on carbon. The double differential measurements are given as function of the muon ...momentum and angle. Relative to our previous publication on this topic, these results have an increased angular acceptance and higher statistics. The data sample presented here corresponds to \(5.7 \times 10^{20}\) protons-on-target. The total flux-integrated cross section is measured to be \((6.950 \pm 0.662) \times 10^{-39}\) cm\(^2\)nucleon\(^{-1}\) and is consistent with our simulation.
The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance and disappearance channels. A sample of electron neutrino candidates at Super-Kamiokande in ...which a pion decay has been tagged is added to the four single-ring samples used in previous T2K oscillation analyses. Through combined analyses of these five samples, simultaneous measurements of four oscillation parameters, \(|\Delta m^2_{32}|\), \(\sin^2(\theta_{23})\), \(\sin^2(\theta_{13})\), and \(\delta_{CP}\) and of the mass ordering are made. A set of studies of simulated data indicates that the sensitivity to the oscillation parameters is not limited by neutrino interaction model uncertainty. Multiple oscillation analyses are performed, and frequentist and Bayesian intervals are presented for combinations of the oscillation parameters with and without the inclusion of reactor constraints on \(\sin^2(\theta_{13})\). When combined with reactor measurements, the hypothesis of CP conservation ($\delta_{CP}$$=0\( or \)\pi\() is excluded at 90% confidence level. The 90% confidence region for \)\delta_{CP}\( is -2.95,-0.44 (-1.47, -1.27) for normal (inverted) ordering. The central values and 68\% confidence intervals for the other oscillation parameters for normal (inverted) ordering are \)\Delta m^{2}_{32}=2.54\pm0.08\( (\)2.51\pm0.08\() \)\times 10^{-3}\( eV\)^2 / c^4\( and \)\sin^2(\theta_{23}) = 0.55^{+0.05}_{-0.09}\( (\)0.55^{+0.05}_{-0.08}\(), compatible with maximal mixing. In the Bayesian analysis, the data weakly prefer normal ordering (Bayes factor 3.7) and the upper octant for \)\sin^2(\theta_{23})$ (Bayes factor 2.4).
We report a measurement of cross section \(\sigma(\nu_{\mu}+{\rm nucleus}\rightarrow\mu^{-}+X)\) and the first measurements of the cross section \(\sigma(\bar{\nu}_{\mu}+{\rm ...nucleus}\rightarrow\mu^{+}+X)\) and their ratio \(R(\frac{\sigma(\bar \nu)}{\sigma(\nu)})\) at (anti-)neutrino energies below 1.5 GeV. We determine the single momentum bin cross section measurements, averaged over the T2K \(\bar{\nu}/\nu\)-flux, for the detector target material (mainly Carbon, Oxygen, Hydrogen and Copper) with phase space restricted laboratory frame kinematics of \(\theta_{\mu}<32^\circ\) and \(p_{\mu}>\)500 MeV/c. The results are \(\sigma(\bar{\nu})=\left( 0.900\pm0.029{\rm (stat.)}\pm0.088{\rm (syst.)}\right)\times10^{-39}\) and \(\sigma(\nu)=\left( 2.41\ \pm0.022{\rm{(stat.)}}\pm0.231{\rm (syst.)}\ \right)\times10^{-39}\) in units of cm\(^{2}\)/nucleon and \(R\left(\frac{\sigma(\bar{\nu})}{\sigma(\nu)}\right)= 0.373\pm0.012{\rm (stat.)}\pm0.015{\rm (syst.)}\).
Recent measurements by the T2K neutrino oscillation experiment indicate that CP violation in neutrino mixing may be observed in the future by long-baseline neutrino oscillation experiments. We ...propose an extension to the currently approved T2K running from \(7.8\times 10^{21}~\mbox{POT}\) to \(20\times 10^{21}~\mbox{POT}\), aiming at initial observation of CP violation with 3\(\,\sigma\) or higher significance for the case of maximum CP violation. The program also contains a measurement of mixing parameters, \(\theta_{23}\) and \(\Delta m^2_{32}\), with a precision of 1.7\(^\circ\) or better and 1%, respectively. With accelerator and beamline upgrades, as well as analysis improvements, this program would occur before the next generation of long-baseline neutrino oscillation experiments that are expected to start operation in 2026.
