Particle correlations from the initial state

Author:

Altinoluk Tolga,Armesto Néstor

Abstract

AbstractThe observation in small size collision systems, pp and pA, of strong correlations with long range in rapidity and a characteristic structure in azimuth, the ridge phenomenon, is one of the most interesting results obtained at the large hadron collider. Earlier observations of these correlations in heavy ion collisions at the relativistic heavy ion collider are standardly attributed to collective flow due to strong final state interactions, described in the framework of viscous relativistic hydrodynamics. Even though data for small size systems are well described in this framework, the applicability of hydrodynamics is less well grounded and initial state based mechanisms have been suggested to explain the ridge. In this review, we discuss particle correlations from the initial state point of view, with focus on the most recent theoretical developments.

Funder

Ministerio de Ciencia e Innovación

Xunta de Galicia

H2020 European Institute of Innovation and Technology

Consellería de Cultura, Educación e Ordenación Universitaria, Xunta de Galicia

H2020 European Research Council

H2020 Marie Sklodowska-Curie Actions

European Cooperation in Science and Technology

Narodowe Centrum Nauki

European Regional Development Fund

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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