T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Problems in Neutrino-Nucleus Scattering

G. T. Garvey

Recently published differential cross sections for neutrino+12C charged current quasi-elasttic scattering (CCQE) by the MiniBooNE collaboration are ~40% larger than typical impulse approximation calculations of CCQE. Some of the difference is due to poor communication betwen the theoriats and experimentalists as to what constitutes CCQE scattering. More fundamntally the observed cross section appears to be larger than the CCQE on 6 free neutrons. A prominent theorist in the field claims "a new paradigm ... will be required." There have been several recent publications failing to account for the observed cross sections. In order to proceed with analysis of their data in the search for nm*ne oscillation the MiniBooNE collaboration fit the neutrino+12C CCQE yield by using MA=1.35 GeV for the nucleon axial form factor. The world average for MA is 1.02 +/- 0.02 GeV. There exists an RPA calculation that finds good agreement with the measured yield but does no reproduce the measured angular distribution. Earler work on electron quasi-elastic scattering demonstrated that short-range correlations plus two-body currents grealtly enhanced the nuclear transverse vector response in agreement with expriment. Extending this approach to neutrino CCQE appears attractive. The current state of affairs in this active area will be presented, noting improvements needed in theory and experiment for neutrino- nucleus scattering in the range of 0.3


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