Diffraction 2016 abstract

Resent results on Central Exclusive Production(CEP) from the STAR experiment
at the RHIC in AuAu collisions.

Leszek Adamczyk, AGH UST Cracow, for the STAR Collaboration

In this talk we shall present recent results on Central Exclusive Production(CEP)  from the STAR experiment
at the RHIC in AuAu collisions. We shall present the measurements involving photonuclear production
of vector meson (rho, omega, J/psi) and non-resonant pion pair in gold-gold ultra peripheral collisions(UPC).
Measurements of the relative amplitudes of the light vector mesons and direct pion pair
components will be presented, along with the phase angle between the rho and omega components.
The squared momentum transfer (t) spectrum shows coherent and incoherent components. The coherent component
exhibits visible diffraction minima. Preliminary results for the cross section as a function J/psi rapidity
and trancverse momentum will be presented and compared to models. Plans for the future will also be discussed.