Constraining hadronization mechanisms with A+ c /D 0 production ratios in Pb–Pb collisions at √sNN = 5.02 TeV

The production of prompt + c baryons at midrapidity (|y| < 0.5) was measured in central (0–10%) and mid-central (30–50%) Pb–Pb collisions at the center-of-mass energy per nucleon–nucleon pair √sNN = 5.02 TeV with the ALICE detector. The results are more precise, more differential in centrality, a...

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Hauptverfasser:	Alme, Johan, Arsene, Ionut Cristian, Balbino, A, Barbera, R, Boca, G, Bregant, M, Canedo, F.D.M, Catalano, F, Chakaberia, I, Chapeland, S, Cheng, T, Chochula, P, Cosentino, M.R, De Martin, Martin, Di Mauro, Mauro, Dudi, S, Eikeland, Viljar Nilsen, Espagnon, B, Feofilov, G, Frajna, E, Gal, A, Galvan, C.D, Garabatos, C, Gay Ducati, Ducati, Greiner, L, Grosa, F, Grosse-Oetringhaus, J.F, Grund, D, Guardiano, G.G, Guo, W, Hamagaki, H, Hernandez, E.G, Hong, G.H, Humanic, T.J, Hutson, A, Isidori, T, Jacobs, P.M, Jahnke, C, Kebschull, U, Khanzadeev, A, Khatun, A, Kileng, Bjarte, Kim, J, Kisel, I, Kisiel, A, Klay, J.L, Klein, J, Klein-Bösing, C, Konig, J, Konopka, P.J, Králik, I, Kuijer, P.G, Kvapil, J, Kwon, J.Y, Lai, Y.S, Li, X, Maire, A, Marín, A, Masoni, A, Mastroserio, A, Miake, Y, Morsch, A, Mudnic, E, Musinsky, J, Nielsen, B.S, Novitzky, N, Nyanin, A, Ohlson, A, Otwinowski, J, Pachmayer, Y, Park, J, Petrovici, M, Pinazza, O, Read, K.F, Redelbach, A.R, Richert, T, Richter, Matthias, Rueda, O.V, Saha, S.K, Sahoo, P, Saini, J, Sambyal, S, Schiaua, C, Schmidt, N.V, Selyuzhenkov, I, Seo, J.J, Šerkšnytė, L, Shaba, T.J, Shabetai, A, Sitta, M, Song, J, Tabassam, U, Toia, A, Velure, Arild, Vickovic, L, Windelband, B, Yalcin, S, Yamakawa, K, Zhigareva, N, Zhou, D
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Zusammenfassung:	The production of prompt + c baryons at midrapidity (\|y\| < 0.5) was measured in central (0–10%) and mid-central (30–50%) Pb–Pb collisions at the center-of-mass energy per nucleon–nucleon pair √sNN = 5.02 TeV with the ALICE detector. The results are more precise, more differential in centrality, and reach much lower transverse momentum (pT = 1 GeV/c) with respect to previous measurements performed by the ALICE, STAR, and CMS Collaborations in nucleus–nucleus collisions, allowing for an extrapolation down to pT = 0. The pT-differential + c /D0 ratio is enhanced with respect to the pp measurement for 4 < pT < 8 GeV/c by 3.7 standard deviations (σ), while the pT-integrated ratios are compatible within 1σ. The observed trend is similar to that observed in the strange sector for the /K0 S ratio. Model calculations including coalescence or statistical hadronization for charm-hadron formation are compared with the data.