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VOLUME 105 | ISSUE 10 | PAGE 593
Corona effect in AA collisions at LHC
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.