[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Nov 26 05:00:03 PST 2013


Date/Time: Tue 2013-11-26 at 13:00

Location:  Theory Room         

Speaker:   Alessandro Lovato (Argonne National Laboratory)

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

Abstract: 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 by the MiniBooNe collaboration 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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