First Measurement of the Charged Current $\overline{\hat{I}}{½}_{\hat{I}}¼$ Double Differential Cross Section on a Water Target without Pions in the final state

Abstract

This paper reports the first differential measurement of the charged-current $\overline{\hat{I}}{½}_{\hat{I}}¼$ 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 $\hat{I}{¼}^{+}$ momentum and angle. The integrated cross section in a restricted phase space is $\ddot{I}ƒ=\left(1.11\pm 0.18\right)\times 10^{-38}$ cm${}^2$ per water molecule. Comparisons with several nuclear models are also presented.

19 pages, 10 figures