Di-photon versus di-hadron correlations in p+A collisions
1 Dept. of Physics, University of Connecticut, High, Storrs, CT 06269, USA
2 Departamento de Física, Universidad Técnica Federico Santa María, Avda. España 1680, Casilla 110-V, Valparaiso, Chile
3 Centro Científico Tecnológico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
a e-mail: Amir.Rezaeian@usm.cl
Published online: 21 March 2016
We study the di-photon correlations in quark-nucleus and proton-nucleus collisions at RHIC and the LHC.We show that the single fragmentation di-photon produces the away side correlations peak, and the double fragmentation component of prompt diphoton is responsible for the near-side peak, and the long-range in rapidity near-side azimuthal collimation, the so-called “ridge” structure. We show that while di-photon ridge exists at the LHC in quark-nucleus collisions, the effect disappears in proton-nucleus collisions at the LHC. We show that the di-photon correlation measurments in p+A collisions can help to discriminate among models and understand the true origin of the observed dihedron ridge in p+A collisions.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.