The first measurement of the γ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5<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 γ(1S)v2 is consistent with 0 and with the small positive values predicted by transport models within uncertainties. The v2 coefficient in 2<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 γ(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.

Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2019). Measurement of γ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at sNN =5.02 TeV. PHYSICAL REVIEW LETTERS, 123(19), 1-13 [10.1103/PhysRevLett.123.192301].

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

Alici A.;Arcelli S.;Bellini F.;Carnesecchi F.;Cifarelli L.;Colocci M.;Jacazio N.;Scioli G.;
2019

Abstract

The first measurement of the γ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5<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 γ(1S)v2 is consistent with 0 and with the small positive values predicted by transport models within uncertainties. The v2 coefficient in 2<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 γ(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.
2019
Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2019). Measurement of γ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at sNN =5.02 TeV. PHYSICAL REVIEW LETTERS, 123(19), 1-13 [10.1103/PhysRevLett.123.192301].
Acharya S.; Adamova D.; Adhya S.P.; Adler A.; Adolfsson J.; Aggarwal M.M.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahmad S.; Ahn S.U.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/724448
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