Eur. Phys. J. C (2009) 61: 589-595
https://doi.org/10.1140/epjc/s10052-009-0928-z

Regular Article - Experimental Physics

Near-side high-p _T correlations: the ridge

Nuclear Physics Institute of the ASCR, Na Truhlarce 39/64, 180 86, Prague, Czech Republic

^* e-mail: jana.bielcikova@ujf.cas.cz

Received: 14 September 2008
Revised: 17 January 2009
Published online: 3 March 2009

Abstract

An overview of results on near-side high-p _T triggered correlations in heavy-ion collisions at RHIC energy is presented. These correlations reveal a novel, long-range pseudo-rapidity correlation, commonly referred to as the ridge which is not present in p+p or d+Au collisions. The centrality, collision system, energy, transverse momentum, path length dependence as well as particle composition of the ridge will be discussed and compared with the properties of the jet-like component at near side. The data are also confronted with theoretical calculations.