Speaker
Dr
William Schmidke
(BNL)
Description
In 2010, the STAR Collaboration collected a large sample of triggers
for ultra-peripheral AuAu collisions. In this talk, I will present
measurements from this sample of J/Psi production in association with
neutrons from photonuclear breakup. Preliminary results for the cross
section as a function rapidity and pT will be presented and compared
to models; the large component at low pT demonstrates the coherent
production of J/Psi off the Au nuclei.
In 2015, STAR also collected a sample of J/Psi mesons in ultra-
peripheral pp and pAu collisions, where the protons were transversely
polarized. The final state proton(s) were measured in the STAR Roman
Pot system, constraining the kinematics of the process. I will present
the prospects for measuring the asymmetry of J/Psi production with
this sample. A non-zero asymmetry would be the first measure of the
generalized parton distribution E for gluons, which is connected with
the orbital angular momentum of partons in the nucleon.
Primary author
Dr
William Schmidke
(BNL)
