Physics and Astronomy
Journal or Book Title
Physical Review C
Measurements of midrapidity charged-particle multiplicity distributions, dN(ch)/d eta, and midrapidity transverse-energy distributions, dE(T)/d eta, are presented for a variety of collision systems and energies. Included are distributions for Au + Au collisions at root s(NN) = 200, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu + Cu collisions at root s(NN) = 200 and 62.4 GeV, Cu + Au collisions at root s(NN) = 200 GeV, U + U collisions at root s(NN) = 193 GeV, d + Au collisions at root s(NN) = 200 GeV, He-3 + Au collisions at root s(NN) = 200 GeV, and p + p collisions at root s(NN) = 200 GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, N-part, and the number of constituent quark participants, N-qp. For all A + A collisions down to root s(NN) = 7.7 GeV, it is observed that the midrapidity data are better described by scaling with N-qp than scaling with N-part. Also presented are estimates of the Bjorken energy density, epsilon(BJ), and the ratio of dE(T)/d eta to dN(ch)/d eta, the latter of which is seen to be constant as a function of centrality for all systems.
American Physical Society
Adare, Andrew; Apadula, Nicole; Belikov, S.; Campbell, Sarah C.; Constantin, Paul; Ding, Lei; Dion, Alan; Grau, Nathan C.; Hill, John C.; Hotvedt, Nels J.; Kempel, Todd; Lajoie, John G.; Lebedev, Alexandre; Ogilvie, Craig; Patel, Milap R.; Pei, H.; Perry, Joshua; Rak, Jan; Rinn, Timothy T.; Rosati, Marzia; Shaver, Alex; Shimomura, M.; Silva, C. L.; Skutnik, S.; Timilsina, Arbin; Vale, Carla; Voas, Brian K.; Wei, Feng; Whitaker, Shawn; et al.; and PHENIX Collaboration, "Transverse energy production and charged-particle multiplicity at midrapidity in various systems from root s(NN)=7.7 to 200 GeV" (2016). Physics and Astronomy Publications. 220.