Document Type

Article

Department/Program

Physics

Journal Title

Physical Review Letters

Pub Date

2013

Volume

111

Issue

2

Abstract

We have isolated (nu) over bar (mu) charged-current quasielastic (QE) interactions occurring in the segmented scintillator tracking region of the MINERvA detector running in the NuMI neutrino beam at Fermilab. We measure the flux-averaged differential cross section, d sigma/dQ(2), and compare to several theoretical models of QE scattering. Good agreement is obtained with a model where the nucleon axial mass, M-A, is set to 0.99 GeV/c(2) but the nucleon vector form factors are modified to account for the observed enhancement, relative to the free nucleon case, of the cross section for the exchange of transversely polarized photons in electron-nucleus scattering. Our data at higher Q(2) favor this interpretation over an alternative in which the axial mass is increased.

DOI

10.1103/PhysRevLett.111.022501

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