[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Mon., Nov. 4, 2013
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room F224/225


Alessandro Lovato
Argonne National Laboratory

*Charge Form Factor and Sum Rules of Electromagnetic and Neutral
Current Response Functions in Carbon-12*

I will report on an ab initio calculation of the 12C elastic form factor 
and sum rules of longitudinal and transverse response functions measured 
in inclusive (e,e') scattering. Our calculations are based on realistic 
nuclear potentials and electromagnetic currents. The longitudinal 
elastic form factor and sum rule are found to be in satisfactory 
agreement with available experimental data. As I will show, a direct 
comparison between theory and experiment is difficult, particularly for 
the transverse sum rule. However, it is shown that the calculated one 
has large contributions from two-body currents, indicating that these 
mechanisms lead to a significant enhancement of the quasi-elastic 
transverse response. This fact may have implications for the anomaly 
observed in recent neutrino quasi-elastic charge-changing scattering 
data off 12C. Preliminary results on the neutral current sum rules, 
obtained within the same theoretical framework and presenting the same 
enhancement from the two-body terms, will also be presented.



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