Spin Physics and Ultra-Peripheral Collisions at STAR

Details Spin Physics and Ultra-Peripheral Collisions at STAR Spin Physics and Ultra-Peripheral Collisions at STAR

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004paun.conf..218g&link_type=abstract

PARTICLES AND THE UNIVERSE. Proceedings of the Eighteenth Lake Louise Winter Institute. Held 16-22 February 2003 in Lake Louise,

Physics

Scientific paper

The STAR Collaboration is investigating the spin structure of the nucleon in polarized proton collisions and diffractive vector meson production in ultra-peripheral heavy-ion collisions. The STAR spin physics program will measure the gluon polarization in the proton, perform a flavor decomposition of the quark and antiquark polarizations, and investigate the transverse spin structure. Results from the first RHIC polarized proton run and plans for the future are described. STAR is also investigating ultra-peripheral heavy-ion collisions, in which the nucleons in the colliding nuclei participate coherently in interactions via long-range fields. STAR has measured large cross sections for coherent ρ0 production, in agreement with theoretical predictions that include factorization of diffractive processes and nuclear excitation. This opens a new laboratory to investigate diffractive interactions.

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