Measurement of Υ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at √sNN=5.02  TeV

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title = "Measurement of Υ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at √sNN=5.02  TeV",
abstract = "The first measurement of the Υ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5<y<4) in Pb–Pb collisions at √sNN=5.02  TeV with the ALICE detector at the LHC. The results are obtained with the scalar product method and are reported as a function of transverse momentum (pT) up to 15  GeV/c in the 5{\%}–60{\%} centrality interval. The measured Υ(1S)v2 is consistent with 0 and with the small positive values predicted by transport models within uncertainties. The v2 coefficient in 2<pT<15  GeV/c is lower than that of inclusive J/ψ mesons in the same pT interval by 2.6 standard deviations. These results, combined with earlier suppression measurements, are in agreement with a scenario in which the Υ(1S) production in Pb–Pb collisions at LHC energies is dominated by dissociation limited to the early stage of the collision, whereas in the J/ψ case there is substantial experimental evidence of an additional regeneration component.",
keywords = "Atomic physics, Physics, Experimental evidence, Forward rapidity, Pb-Pb collisions, Positive value, Scalar product, Standard deviation, Transport models, Transverse momenta, Binary alloys",
author = "{ALICE Collaboration} and S Acharya and Jonatan Adolfsson and Peter Christiansen and Oliver Matonoha and Adrian Nassirpour and Anders Oskarsson and Tuva Richert and {Vazquez Rueda}, Omar and David Silvermyr and Evert Stenlund and N Zurlo",
year = "2019",
doi = "10.1103/PhysRevLett.123.192301",
language = "English",
volume = "123",
journal = "Physical Review Letters",
issn = "1079-7114",
publisher = "American Physical Society",
number = "19",