Thomas Mehen
Duke University
mehen@phy.duke.edu

Anna Stasto
Pennsylvania State University
astasto@phys.psu.edu

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Inge Dolan
inge@u.washington.edu
(206) 685-4286

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Abstract: A long standing problem in quarkonium physics is the disagreement between the measured polarization of the J/psi produced at large transverse momentum in proton-antiproton collisions and the theoretical prediction based on non-relativistic QCD (NRQCD). I will argue that the NRQCD approach is incomplete, and suffers from large logarithmic contributions that may invalidate the theoretical predictions. I will derive a new factorization formula for the differential cross section for the production of a heavy quarkonium state at large transverse momentum, and show how the large logarithms in NRQCD are summed in this formalism. I will comment on how this formalism may change the prediction of the J/psi polarization, though a definitive answer will have to wait for a complete calculation.

Wednesday, November 16
11 am: Information discussion and meeting

Thursday, November 17
11 am: Thomas Mehen, "Effective Field Theory for Heavy Hadron Molecules"

Friday, November 18
11 am: Information discussion and meeting