Forward dihadron back-to-back correlations in pA collisions
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Show full item recordEditorial
American Physical Society
Date
2019-01-02Referencia bibliográfica
Albacete, J. L., Giacalone, G., Marquet, C., & Matas, M. (2019). Forward dihadron back-to-back correlations in p A collisions. Physical Review D, 99(1), 014002.
Sponsorship
The work of C. M. was supported in part by the Agence Nationale de la Recherche under Project No. ANR-16- CE31-0019-02. The work of M. M. has been supported by Grant No. 17-04505S of the Czech Science Foundation (GACR) and has been performed in the framework of COST Action CA15213 THOR. Computational resources were provided by the CESNET LM2015042 and the CERIT Scientific Cloud LM2015085, provided under the program “Projects of Large Research, Development, and Innovations Infrastructures.”Abstract
We study the disappearance of the away-side peak of the di-hadron correlation function in p + A
vs p + p collisions at forward rapidities, when the scaterring process presents a manifest dilute-dense
asymmetry. We improve the state-of-the-art description of this phenomenon in the framework of the color
glass condensate (CGC), for hadrons produced nearly back to back. In that case, the gluon content of the
saturated nuclear target can be described with transverse-momentum-dependent gluon distributions, whose
small-x evolution we calculate numerically by solving the Balitsky-Kovchegov equation with running
coupling corrections. We first show that our formalism provides a good description of the disappearance of
the away-side azimuthal correlations in d + Au collisions observed at BNL Relativistic Heavy Ion Collider
(RHIC) energies. Then, we predict the away-side peak of upcoming p + Au data at
root s = 200 GeV to be
suppressed by about a factor 2 with respect to p + p collisions, and we propose to study the rapidity
dependence of that suppression as a complementary strong evidence of gluon saturation in experimental data.