Abstract
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.
Highlights
The Tokai-to-Kamioka (T2K) experiment [1] is a longbaseline neutrino oscillation experiment, with a beam originating at Japan Proton Accelerator Complex (J-PARC) which consists primarily of muon neutrinos
This paper focuses on a measurement of charged-current quasielastic (CCQE)-like events in which no pions are observed in the final state (CC0π)
The ND280 detector contains water targets, and this paper presents a measurement of the νμ CC0π interaction cross section on water
Summary
The Tokai-to-Kamioka (T2K) experiment [1] is a longbaseline neutrino oscillation experiment, with a beam originating at Japan Proton Accelerator Complex (J-PARC) which consists primarily of muon neutrinos. At the energies of the T2K beam line, the main neutrino interaction process is charged-current quasielastic (CCQE) interactions (νμ þ n → μ− þ p). Because these neutrino interactions occur within nuclear targets and not on free nuclei, additional nuclear effects and final state interactions can modify the composition and kinematics of the particles that are observed to be exiting the interaction. The ND280 detector contains water targets, and this paper presents a measurement of the νμ CC0π interaction cross section on water This process is very important for T2K’s neutrino oscillation measurements since this is the dominant reaction in the far detector. The K2K experiment has published a measurement of the axial vector mass in neutrino-oxygen CCQE interactions [11] using the SciFi detector, but not a differential cross section measurement
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