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- W2313013538 abstract "We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb--Pb collisions at $sqrt{s_{rm NN}}=2.76$ TeV as a function of collision centrality and the average transverse momentum of the pair $k_{rm T}$. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with $k_{rm T}$, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with $left< mathrm{d}N_{rm ch}/mathrm{d}eta right>^{1/3}$. This behaviour is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller $sqrt{s_{rm NN}}$, a decrease in the $R_{rm out}/R_{rm side}$ ratio is seen, which is in qualitative agreement with specific predictions from hydrodynamic models. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the LHC." @default.
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- W2313013538 date "2016-02-04" @default.
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- W2313013538 title "Centrality dependence of pion freeze-out radii in Pb-Pb collisions at<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi mathvariant=italic>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn></mml:mrow></mml:math> TeV" @default.
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- W2313013538 doi "https://doi.org/10.1103/physrevc.93.024905" @default.
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