[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Thursday, March 10, 2016
3:30 p.m. (coffee at 3:15 p.m.)
CEBAF Center, Room F113

Raul Briceno
JLab/ODU

*Meson Electro/Photo-production from QCD *

I present the calculation of the pi+ gamma -> pi+ pi0 transition 
amplitude from quantum chromodynamics. The amplitude
is determined for a range of values of the photon virtuality [up to 
Q^2=1 GeV^2] and the final state energy. One observes
a clear dynamical enhancement due to the presence of the rho-resonance. 
By fitting the transition amplitude and analytically
continuing it onto the \rho-pole, the rho -> pi gamma form factor is 
obtained. This exploratory calculation, performed using
quantum chromodynamics, constitutes the very first determination of an 
electromagnetic production/decay of a hadronic
resonance directly from the fundamental theory of quarks and gluons. I 
highlight some of the necessary steps that made this
calculation possible, and I discuss the status and outlook of the field 
for the study of N gamma -> N* -> N pi / N pi pi transitions.
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