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Zhang","submitted_at":"2016-05-05T10:03:10Z","abstract_excerpt":"In Pb-Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 2.76 TeV, we report on a geometrical scaling in the transverse momentum ($p_{\\rm T}$) spectra of inclusive charged hadrons at 0-5$\\%$, 5-10$\\%$, 10-20$\\%$, 20-30$\\%$, 30-40$\\%$, 40-50$\\%$, 50-60$\\%$, 60-70$\\%$ and 70-80$\\%$ centralities. This geometrical scaling is exhibited when these spectra are expressed in terms of a new scaling variable, $p_{\\rm T}^{\\prime}=p_{\\rm T}(191.5/N_{A})^{1/(3\\lambda+6)}$, where $N_{A}$ is the number of participating nucleon pairs, $\\lambda$ is the scaling parameter. 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