Experimental and theoretical results for weak charge current backward proton production

Abstract

In this paper, we study deuteron breakup by high energy neutrinos. We present previously unpublished data on neutrino induced backward protons from deuteron targets; we calculate the contributions from both the two-nucleon $(2N)$ and six-quark $(6q)$ deuteron components, which depend upon the overall normalization of the part that is $6q;$ and, we suggest other signatures for distinguishing the $2N$ and $6q$ clusters. We conclude that the $6q$ cluster naturally contributes to the high momentum backward proton spectrum just in the region where the standard $2N$ models lie below the data, and the absolute size of the far backward data is nicely explained if the amount of $6q$ is one or a few percent by normalization of the deuteron.