Photon polarization as a probe for quark-gluon plasma dynamics
Abstract
Prospects of measuring polarized photons emitted from a quark-gluon plasma (QGP) are discussed. In particular, the detection of a possible quark spin polarization in a QGP using circularly polarized photons emitted from the plasma is studied. Photons leave the QGP without further interaction and thus provide a primary probe for quark polarization within the QGP. We find that photon polarization cannot solely arise due to a possible QGP momentum space anisotropy, but may be enhanced due to it. In particular, for oblate momentum distributions and high photon energies, quark polarization is efficiently transfered to photon polarization. The role of competing sources of polarized photons in heavy-ion collisions is discussed.
Cite
@article{arxiv.0710.5700,
title = {Photon polarization as a probe for quark-gluon plasma dynamics},
author = {Andreas Ipp and Antonino Di Piazza and Jörg Evers and Christoph H. Keitel},
journal= {arXiv preprint arXiv:0710.5700},
year = {2008}
}
Comments
12 pages, 4 figures; v2: discussion extended; accepted for publication in Physics Letters B