Eur. Phys. J. C (2009) 62: 277-280
https://doi.org/10.1140/epjc/s10052-009-0902-9

Regular Article - Theoretical Physics

Long range untriggered two particle correlations

¹ Department of Physics and Astronomy, Wayne State University, 666 W. Hancock, Detroit, MI, 48201, USA
² Physics Department and RIKEN Brookhaven Research Center, Building 510A Brookhaven National Laboratory, Upton, NY, 11973, USA

^* e-mail: gmoschelli@gmail.com

Received: 30 September 2008
Published online: 17 February 2009

Abstract

Relativistic Heavy Ion Collider experiments exhibit correlations peaked in relative azimuthal angle and extended in rapidity. Called the ridge, this peak occurs both with and without a jet trigger. We argue that the untriggered ridge arises when particles formed by flux tubes in an early glasma stage later manifest transverse flow. Combining a blast wave model of flow fixed by single-particle spectra with a simple description of the glasma, we find excellent agreement with current data.