Measurement of event-by-event transverse momentum and multiplicity fluctuations using strongly intensive measures
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PhysRevC.92.044905.pdf
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Author(s)
NA49 Collaboration
Anticic, T.
Baatar, B.
Bartke, J.
Beck, H.
Betev, L.
Białkowska, H.
Blume, C.
Boimska, B.
Book, J.
Date Issued
October 2015
Journal
Physical Review C
Publisher
American Physical Society (APS)
Citation
Anticic, T. et al. “Measurement of Event-by-Event Transverse Momentum and Multiplicity Fluctuations Using Strongly Intensive measuresΔ[PT,N]andΣ[PT,N]in Nucleus-Nucleus Collisions at the CERN Super Proton Synchrotron.” Physical Review C 92, 4 (October 2015): 044905 © 2015 American Physical Society
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PHYSREVC.92.044905
