Περίληψη:
Results from the NA49 experiment at the CERN Super Proton Synchrotron (SPS) are presented on event-by-event transverse momentum and multiplicity fluctuations of charged particles, produced at forward rapidities in central Pb+Pb interactions at beam momenta 20A, 30A, 40A, 80A, and 158A GeV/c, as well as in systems of different sizes (p+p, C+C, Si+Si, and Pb+Pb) at 158A GeV/c. This publication extends the previous NA49 measurements of the strongly intensive measure ΦpT by a study of the recently proposed strongly intensive measures of fluctuations Δ[PT,N] and Σ[PT,N]. In the explored kinematic region transverse momentum and multiplicity fluctuations show no significant energy dependence in the SPS energy range. However, a remarkable system size dependence is observed for both Δ[PT,N] and Σ[PT,N], with the largest values measured in peripheral Pb+Pb interactions. The results are compared with NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) measurements in p+p collisions, as well as with predictions of The Ultrarelativistic Quantum Molecular Dynamics and EPOS models. © 2015 American Physical Society.
Συγγραφείς:
Anticic, T.
Baatar, B.
Bartke, J.
Beck, H.
Betev, L.
Białkowska, H.
Blume, C.
Boimska, B.
Book, J.
Botje, M.
Bunčić, P.
Christakoglou, P.
Chung, P.
Chvala, O.
Cramer, J.
Eckardt, V.
Fodor, Z.
Foka, P.
Friese, V.
Gaździcki, M.
Grebieszkow, K.
Höhne, C.
Kadija, K.
Karev, A.
Kolesnikov, V.
Kowalski, M.
Kresan, D.
Laszlo, A.
Lacey, R.
Van Leeuwen, M.
Maćkowiak-Pawłowska, M.
Makariev, M.
Malakhov, A.
Melkumov, G.
Mitrovski, M.
Mrówczyński, S.
Pálla, G.
Panagiotou, A.
Pluta, J.
Prindle, D.
Pühlhofer, F.
Renfordt, R.
Roland, C.
Roland, G.
Rybczyński, M.
Rybicki, A.
Sandoval, A.
Rustamov, A.
Schmitz, N.
Schuster, T.
Seyboth, P.
Siklér, F.
Skrzypczak, E.
Słodkowski, M.
Stefanek, G.
Stock, R.
Ströbele, H.
Susa, T.
Szuba, M.
Varga, D.
Vassiliou, M.
Veres, G.
Vesztergombi, G.
Vranić, D.
Włodarczyk, Z.
Wojtaszek-Szwarc, A.
