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Ajitanand, N. N.; Alfred, M.; Apadula, N.; Ayuso, C.; Bai, M.; Bandara, N. S.; Barish, K. N.; Bazilevsky, A.; Beaumier, M.; Butler, C.; Campbell, S.; Choi, I. J.; Chujo, T.; Citron, Z.; DeBlasio, K.; Fan, W.; Fukuda, Y.; Gal, C.; Gallus, P.; Garg, P.; Ge, H.; Gunji, T.; Hahn, K. I.; Hamilton, H. F.; Han, S. Y.; Hanks, J.; Hasegawa, S.; Hill, K.; Huang, S.; Imai, K.; Jiang, X.; Jorjadze, V.; Kazantsev, A. V.; Kim, C.; Klatsky, J.; Kline, P.; Kurosawa, M.; Kwon, Y.; Lee, S.; Lee, S. H.; Leitch, M. J.; Lewis, N. A.; Li, X.; Liu, L. D.; Makek, M.; McGlinchey, D.; McKinney, C.; Meles, A.; Mendez, A. R.; Mendoza, M.; Mihalik, D. E.; Mitsuka, G.; Mohanty, A. K.; Moon, T.; Murakami, T.; Mwai, A.; Nagy, M. I.; Nakagomi, H.; Nakano, K.; Netrakanti, P. K.; Ogilvie, C. A.; Oskarsson, A.; Ozawa, K.; Papavassiliou, V.; Perera, G. D. N.; Peressounko, D. Yu; PerezLara, C. E.; Phipps, M.; Press, C. J.; Pun, A.; Riabov, Y.; Sahlmueller, B.; Saito, N.; Sedgwick, K.; Sen, A.; Shibata, T.-A.; Shukla, P.; Singh, B. K.; Singh, C. P.; Sorensen, S. P.; Sourikova, I. V.; Stankus, P. W.; Stien, H.; Sukhanov, A.; Sumita, T.; Sun, J.; Syed, S.; Tarafdar, S.; Tieulent, R.; Tomášek, M.; Towell, C. L.; Ujvari, B.; van Hecke, H. W.; Vazquez-Carson, S.; Vrba, V.; Xu, Q.; Yalcin, S.; Yoo, J. H.; Zhou, S.; Zou, L.
Physical review. C, 03/2017, Letnik: 95, Številka: 3Journal Article
The PHENIX Collaboration has measured the ratio of the yields of ψ(2S) to ψ(1S) mesons produced in p+p, p+Al, p+Au, and He3+Au collisions at sNN=200 GeV over the forward and backward rapidity intervals 1.2<|y|<2.2. We find that the ratio in p+p collisions is consistent with measurements at other collision energies. In collisions with nuclei, we find that in the forward (p-going or He3-going) direction, the relative yield of ψ(2S) mesons to ψ(1S) mesons is consistent with the value measured in p+p collisions. However, in the backward (nucleus-going) direction, the ψ(2S) meson is preferentially suppressed by a factor of ∼2. This suppression is attributed in some models to the breakup of the weakly bound ψ(2S) meson through final-state interactions with comoving particles, which have a higher density in the nucleus-going direction. These breakup effects may compete with color screening in a deconfined quark-gluon plasma to produce sequential suppression of excited quarkonia states.
