Ultra-peripheral collisions in STAR
DOI:
https://doi.org/10.23727/CERN-Proceedings-2018-001.157Keywords:
ultra-peripheral collisions, STAR, $\rho^0$ photoproduction, diffraction, gluon shadowing.Abstract
A collision occuring at impact parameter larger than the sum of nuclear radii is denotedas an Ultra-Peripheral Collision (UPC). Such a collision is mediated by electromagnetic
forces, because hadronic interactions are strongly suppressed. Ultra-relativistic heavy ions
allow to study of photon-nucleus and photon-photon collisions, providing a sensitive probe
of phenomena of gluon shadowing, nuclear diffraction and fundamental quantum electrodynamics.
Here we report on the STAR measurements of coherent photoproduction of $\rho^0$ and $J/\psi$ mesons
and of exclusive photoproduction of $e^+e^-$ pairs in Au+Au collisions
at $\sqrt{s_{\mathrm{NN}}}$ = 200~GeV
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Published
2018-12-20
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Section
Photon-hadron collisions at hadron colliders
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