Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN = 5.02 TeV

• Autor(a) principal: Acharya, Shreyasi
• Data de Publicação: 2019
• Outros Autores: Gay Ducati, Maria Beatriz, Pereira, Luis Gustavo, Pezzi, Rafael Peretti, ALICE Collaboration
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/194776
• topic: Aceleradores de partículas; Colisao de ions pesados; Mésons psi; Hadron-Hadron scattering (experiments)

The second (v2) and third (v3) ow harmonic coe cients of J/ mesons are measured at forward rapidity (2:5 < y < 4:0) in Pb-Pb collisions at p sNN = 5.02TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ v3 is observed with 3.7 signi cance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ ) < vn(D0) < vn(h ) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ ) v2(D0) v2(h ) at high pT above 6{8 GeV/c. In semicentral collisions (5{40% and 10{50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3=v2 of J/ mesons is found to be signi cantly lower (4.6 ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coe cients. The J/ v2 coe cient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.