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Alfaro Molina, R.; Baek, Y.W.; Ball, M.; Basu, S.; Bedda, C.; Bertens, R.A.; Berzano, D.; Bhasin, A.; Biswas, S.; Blau, D.; Bonomi, G.; Broker, T.A.; Broz, M.; Bufalino, S.; Concas, M.; Cortés Maldonado, I.; Danu, A.; Dash, A.; de Conti, C.; Diaz Corchero, M.A.; Dillenseger, P.; Dupieux, P.; Espagnon, B.; Eulisse, G.; Faivre, J.; Ferreiro, E.G.; Ganoti, P.; Ghosh, J.; Ghosh, P.; Gonzalez, V.; Grabski, V.; Grosa, F.; Guerzoni, B.; Gupta, R.; Hadjidakis, C.; Harton, A.; Hassan, H.; Herrera Corral, G.; Herrmann, F.; Izucheev, V.; Jena, C.; Jones, P.G.; Karayan, L.; Kim, J.; Kollegger, T.; Kovalenko, O.; Krivda, M.; Kryshen, E.; Kumar, A.; Kweon, M.J.; Kwon, Y.; La Rocca, P.; Luettig, P.; Luhder, J.R.; Margutti, J.; Masson, E.; Mudnic, E.; Nair, R.; Narayan, A.; Nellen, L.; Nyanin, A.; Oppedisano, C.; Orava, R.; Pei, H.; Peresunko, D.; Peskov, V.; Petrov, V.; Preghenella, R.; Read, K.F.; Renfordt, R.; Reygers, K.; Riabov, V.; Rodríguez Cahuantzi, M.; Rosas, E.D.; Sahoo, R.; Scarlassara, F.; Schiaua, C.; Schweda, K.; Sekihata, D.; Shou, Q.; Simatovic, G.; Slupecki, M.; Suaide, A.A.P.; Sugitate, T.; Takahashi, J.; Tarhini, M.; Thakur, S.; Thomas, D.; Trogolo, S.; Tveter, T.S.; van Leeuwen, M.; Vargas, A.; Vargyas, M.; Vechernin, V.; Watanabe, D.; Weiser, D.F.; Zampolli, C.; Zhang, C.; Zhou, Z.; Zichichi, A.
Physics letters. B, 05/2018, Letnik: 780Journal Article
We present a measurement of azimuthal correlations between inclusive J/ψ and charged hadrons in p–Pb collisions recorded with the ALICE detector at the CERN LHC. The J/ψ are reconstructed at forward (p-going, 2.03<y<3.53) and backward (Pb-going, −4.46<y<−2.96) rapidity via their μ+μ− decay channel, while the charged hadrons are reconstructed at mid-rapidity (|η|<1.8). The correlations are expressed in terms of associated charged-hadron yields per J/ψ trigger. A rapidity gap of at least 1.5 units is required between the trigger J/ψ and the associated charged hadrons. Possible correlations due to collective effects are assessed by subtracting the associated per-trigger yields in the low-multiplicity collisions from those in the high-multiplicity collisions. After the subtraction, we observe a strong indication of remaining symmetric structures at Δφ≈0 and Δφ≈π, similar to those previously found in two-particle correlations at middle and forward rapidity. The corresponding second-order Fourier coefficient (v2) in the transverse momentum interval between 3 and 6 GeV/c is found to be positive with a significance of about 5σ. The obtained results are similar to the J/ψv2 coefficients measured in Pb–Pb collisions at sNN=5.02 TeV, suggesting a common mechanism at the origin of the J/ψv2.
