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Pantuev, V. S.
JETP letters, 05/2017, Letnik: 105, Številka: 10Journal Article
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 the LHC energies. Our hypothesis was based on experimental data, which raised the idea of a finite formation time for the produced medium. At the RHIC energy and in low-density corona region, this time reaches about 2 fm/ c . Following this hypothesis, the nuclear modification factor R AA at high p t should be independent on particle momentum, and the azimuthal anisotropy of high p t particles, v 2 , should be finite. A separate prediction held that, at the LHC energy, the formation time in the corona region should be about 1 fm/ c . New LHC data show that R AA is not flat and is rising with p t . 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 R AA dependencies. The shift of about 7 GeV is also valid at the RHIC energy. We also show that the observed at the LHC dependence of v 2 at high p t and our previous predictions agree.
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