[Jlab-seminars] Physics Seminar Announcement Reminder

[Luci Collins]

*Physics Seminar
Friday, Sept. 9, 2011
11:00AM
CEBAF Center AUD.
Cookies & Coffee at 10:45
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*Gerry Garvey
Los Alamos National Lab

"Problems in Neutrino-Nucleus Scattering" *

Recently published differential cross sections for neutrino charged 
current quasi-elastic scattering (CCQE) on 12C by the MiniBooNE 
collaboration are ~40% larger than typical impulse approximations 
calculations of CCQE. Some of the difference is do to poor communication 
between the theorists and experimentalists as to the definition of CCQE 
scattering. More fundamentally the observed cross section appears to be 
larger than the CCQE on 6 free neutrons. A prominent theorist in the 
field claimed "a new paradigm" will be required and there have been 
several recent publications failing to account for the observed cross 
sections.

In order to proceed with analysis of their data the MiniBooNE 
collaboration fit the muon neutrino +12C CCQE yield by employing MA=1.35 
GeV for the nucleon axial vector form factor. The world average for MA 
is 1.02? 0.02GeV. There exits an RPA calculation that finds good 
agreement with the measured yield using MA=1.03 GeV but does not 
reproduce the measured angular distribution.

Some earlier work on electron quasi-elastic scattering demonstrated that 
short-range correlations plus two-body currents greatly enhance the 
nuclear transverse vector response in agreement with experiment. 
Extending this approach to neutrino CCQE is most attractive. A direct 
consequence of the approach is that the assigned neutrino energy becomes 
far more uncertain than previously realized. The current state of 
affairs in this active area will be presented noting improvements needed 
in theory and experiment for neutrino-nucleus scattering for 0.3<En<3.0 GeV.


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