Physics and Astronomy
Journal or Book Title
Physical Review C
Production of π0 and η mesons has been measured at midrapidity in Cu+Au collisions at √sNN=200 GeV. Measurements were performed in π0(η)→γγ decay channel in the 1(2)−20 GeV/c transverse momentum range. A strong suppression is observed for π0 and η meson production at high transverse momentum in central Cu+Au collisions relative to the p+p results scaled by the number of nucleon-nucleon collisions. In central collisions the suppression is similar to Au+Au with comparable nuclear overlap. The η/π0 ratio measured as a function of transverse momentum is consistent with mT-scaling parametrization down to pT=2 GeV/c, its asymptotic value is constant and consistent with Au+Au and p+p and does not show any significant dependence on collision centrality. Similar results were obtained in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions as well as in e+e− collisions in a range of collision energies √sNN=3−1800 GeV. This suggests that the quark-gluon-plasma medium produced in Cu+Cu collisions either does not affect the jet fragmentation into light mesons or it affects the π0 and η the same way.
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American Physical Society
Aidala, C.; Apadula, Nicole J.; Campbell, Sarah C.; Ding, Lei; Hill, John C.; Hotvedt, Nels J.; Lajoie, John G.; Lebedev, Alexandre; Lee, S. H.; Ogilvie, Craig; Patel, Milap R.; Perry, Joshua; Rinn, Timothy T.; Rosati, Marzia; Runchey, Jonathan C.; Sen, Abhisek; Shaver, Alex; Shimomura, M.; Timilsina, Arbin; Whitaker, Shawn; et al.; and PHENIX Collaboration, "Production of π0 and η mesons in Cu + Au collisions at √sNN = 200 GeV" (2018). Physics and Astronomy Publications. 500.