[Theory-seminars] Theory Seminar. Thursday. Room F113 3.30pm. Raul Briceno

[Alessandro Pilloni]

Theory Seminar

Thursday, Mar 10, 2016
3:30 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 lattice quantum chromodynamics, constitutes the very first determination of an electromagetic 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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