K and production in Pb-Pb collisions at = 2.76 TeV
arXiv:1307.5530 · doi:10.1103/PhysRevLett.111.222301
Abstract
The ALICE measurement of K and production at mid-rapidity in Pb-Pb collisions at TeV is presented. The transverse momentum () spectra are shown for several collision centrality intervals and in the range from 0.4 GeV/ (0.6 GeV/ for ) to 12 GeV/. The dependence of the /K ratios exhibits maxima in the vicinity of 3 GeV/, and the positions of the maxima shift towards higher with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate is not observed in pp interactions at sqrt(s) = 0.9 TeV and at sqrt(s) = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured spectra above 2 GeV/ progressively decouple from hydrodynamical-model calculations. For higher values of , models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the dependence of the /K ratio.
16 pages, 3 captioned figures, 1 table, authors from page 11, published version contains only left panel of fig 2 and fig 3, figures at http://aliceinfo.cern.ch/ArtSubmission/node/603
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