<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body text="#000000" bgcolor="#FFFFFF">
Theory Center Seminar<br>
<div>Thursday, March 10, 2016<br>
3:30 p.m. (coffee at 3:15 p.m.)<br>
CEBAF Center, Room F113<br>
<br>
Raul Briceno<br>
JLab/ODU<br>
<br>
<b>Meson Electro/Photo-production from QCD </b><br>
<div>
<div>
<div class="moz-forward-container">
<div class="moz-forward-container">
<div class="moz-forward-container">
<div class="moz-forward-container">
<div class="moz-forward-container"> <br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
I present the calculation of the pi+ gamma -> pi+ pi0 transition
amplitude from quantum chromodynamics. The amplitude <br>
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 <br>
a clear dynamical enhancement due to the presence of the
rho-resonance. By fitting the transition amplitude and analytically
<br>
continuing it onto the \rho-pole, the rho -> pi gamma form factor
is obtained. This exploratory calculation, performed using <br>
quantum chromodynamics, constitutes the very first determination of
an electromagnetic production/decay of a hadronic<br>
resonance directly from the fundamental theory of quarks and gluons.
I highlight some of the necessary steps that made this<br>
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.
</body>
</html>