1 Ocak 2020 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;The elliptic flow (${v}_{2}$) of (anti-)$^{3}$He is measured in Pb–Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02\phantom{\rule{0.25em}{0ex}}\text{TeV}$ in the transverse-momentum (${p}_{T}$) range of 2–6 GeV/c for the centrality classes 0–20%, 20–40%, and 40–60% using the event-plane method. This measurement is compared to that of pions, kaons, and protons at the same center-of-mass energy. A clear mass ordering is observed at low ${p}_{T}$, as expected from relativistic hydrodynamics. The violation of the scaling of ${v}_{2}$ with the number of constituent quarks at low ${p}_{T}$, already observed for identified hadrons and deuterons at LHC energies, is confirmed also for (anti-)$^{3}$He. The elliptic flow of (anti-)$^{3}$He is underestimated by the Blast-Wave model and overestimated by a simple coalescence approach based on nucleon scaling. The elliptic flow of (anti-)$^{3}$He measured in the centrality classes 0–20% and 20–40% is well described by a more sophisticated coalescence model where the phase-space distributions of protons and neutrons are generated using the iEBE-VISHNU hybrid model with AMPT initial conditions.&lt;/p&gt;</subfield>
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    <subfield code="a">Measurement of the (anti-) He elliptic flow in Pb–Pb collisions at</subfield>
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