Abstract
Long-range correlations between particles separated by a pseudorapidity gap are a powerful tool to explore the initial stages and evolution of the medium created in hadron-hadron collisions. An overview of the long-range correlations measured by the ALICE detector in pp, p-Pb and Pb-Pb will be presented. This includes analyses of forward-backward, two- and multi-particle correlations with the use of the central barrel and forward detectors.
Highlights
Long-range correlations (LRC) are usually considered between particles separated by pseudorapidity gap, that is typically taken to be |∆η| 1.0 in order to suppress contribution from resonances andjets
Two-particle correlations with large separating η gaps between pairs of particles allows one to get rid of short-range correlations and obtain the correlation pattern, azimuthal profile of which can be decomposed into Fourier series
Another technique, which is sensitive to collective phenomena, uses multiparticle correlations, for example, elliptic flow can be measured by calculating second-order Fourier coefficient v2 taking 4, 6, 8 or even all particles in event
Summary
1. Introduction Long-range correlations (LRC) are usually considered between particles separated by pseudorapidity gap, that is typically taken to be |∆η| 1.0 in order to suppress contribution from resonances and (mini)jets. Forward-backward correlation analysis is another method sensitive to even-by-event fluctuations of number and properties of particle-emitting sources elongated in rapidity.
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