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VOLUME 105 (2017) | ISSUE 10 | PAGE 593
Corona effect in AA collisions at LHC
DOI: 10.7868/S0370274X17100022
Abstract
Following our earlier finding based on RHIC data on the dominant jet production from nucleus corona region, we reconsider this effect in nucleus-nucleus collisions at LHC energies. Our hypothesis was based on experimental data, which raised the idea of a finite formation time for the produced medium. At RHIC energy and in low density corona region this time reaches about 2 fm/c. Following this hypothesis, the nuclear modification factor RAA at high pt should be independent on particle momentum, and the azimuthal anisotropy of high pt particles, v2, should be finite. A separate prediction held that, at LHC energy, the formation time in the corona region should be about 1 fm/c. New data at LHC show that RAA is not flat and is rising with pt. We add to our original hypothesis an assumption that a fast parton traversing the produced medium loses the fixed portion of its energy. A shift of about 7 GeV from the original power law p-6 production cross section in pp explains well all the observed RAA dependencies. The shift of about 7 GeV is also valid at RHIC energy. We also show that the observed at LHC dependence of v2 at high pt and our previous predictions agree.