Particle production in central Pb + Pb collisions at 158 AGeV/c

Bearden, I.G.; Wolf, K.L.; Ljubicic, A., Jr.; Paic, G.; Polychronakos, V.; Hansen, O.; Hardtke, D.; Sakaguchi, A.; Dodd, J.; Kohama, T.; Sugitate, T.; Christiansen, P.H.L.; Fields, D.E.; Pluta, J.; Murray, M.; Kaimi, K.; Kopytine, M.; Boissevain, J.; Hansen, A.G.; Lorstad, B.; Piuz, F.; Reichhold, D.; Maeda, N.; Hamelin, M.; Holzer, E.B.; Jacak, B.V.; Ferenc, D.; Poulard, G.; Simon-Gillo, J.; Potekhin, M.; Sullivan, J.P.; Pandey, S.U.; Franz, A.; Gaardhoje, J.J.; Martin, L.; Hummel, P.; Boggild, H.; Ohnishi, H.; Fabjan, C.W.; Sondheim, W.; Willis, W.J.; Zachary, D.S.; Kaneta, M.; Spegel, M.; Medvedev, A.; van Hecke, H.; Xu, N.; Malina, R.; Leltchouk, M.; Schmidt-Sorensen, J.; Conin, L.; Erazmus, B.; Sumi, Y.; Humanic, T.J.; Esumi, S.

doi:10.1103/PhysRevC.66.044907

Article
Report number	nucl-ex/0202019
Title	Particle production in central Pb + Pb collisions at 158 AGeV/c
Related title	SUPER PROTON SYNCHROTRON Particle production in Pb + Pb collisions at the CERN SPS
Author(s)	Bearden, I.G. ; Boggild, H. ; Boissevain, J. ; Christiansen, P.H.L. ; Conin, L. ; Dodd, J. ; Erazmus, B. ; Esumi, S. ; Fabjan, C.W. ; Ferenc, D. ; Fields, D.E. ; Franz, A. ; Gaardhoje, J.J. ; Hamelin, M. ; Hansen, A.G. ; Hansen, O. ; Hardtke, D. ; van Hecke, H. ; Holzer, E.B. ; Humanic, T.J. ; Hummel, P. ; Jacak, B.V. ; Kaimi, K. ; Kaneta, M. ; Kohama, T. ; Kopytine, M. ; Leltchouk, M. ; Ljubicic, A., Jr. ; Lorstad, B. ; Maeda, N. ; Malina, R. ; Martin, L. ; Medvedev, A. ; Murray, M. ; Ohnishi, H. ; Paic, G. ; Pandey, S.U. ; Piuz, F. ; Pluta, J. ; Polychronakos, V. ; Potekhin, M. ; Poulard, G. ; Reichhold, D. ; Sakaguchi, A. ; Schmidt-Sorensen, J. ; Simon-Gillo, J. ; Sondheim, W. ; Spegel, M. ; Sugitate, T. ; Sullivan, J.P. ; Sumi, Y. ; Willis, W.J. ; Wolf, K.L. ; Xu, N. ; Zachary, D.S.
Affiliation	(CERN)
Publication	2002
Imprint	2002-02
Number of pages	10 p, 10
Note	10 pages, including 11 figures and 3 tables, REVTeX, submitted to Phys. Rev. C (2nd version)
In:	Phys. Rev. C 66 (2002) 44907-1-9
DOI	10.1103/PhysRevC.66.044907
Subject category	Nuclear Physics
Accelerator/Facility, Experiment	CERN SPS ; NA44
Abstract	The NA44 experiment has measured single-particle inclusive spectra for charged pions, kaons, and protons as a function of transverse mass near midrapidity in 158A GeV/c Pb+Pb collisions. From the particle mass dependence of the observed m/sub T/ distributions, we are able to deduce a value of about 120 MeV for the temperature at thermal freeze-out. From the observed ratios of the rapidity densities, we find values of the chemical potentials for light and strange quarks and a chemical freeze-out temperature of approximately 140 MeV. (34 refs).

$The $\pi$, $K$, and $p$ acceptance in rapidity and $p_T$. In this analysis, pions at the 8 GeV/$c$ 44 mrad angle setting are selected with $p_T$$>$0.35 GeV/$c$.$ $An example of particle identification in the 4 GeV/$c$ setting. The contour plot shows pulse heights of C1 and C2 (left). The region (a) is electron veto and pion required by C1 and C2 pulse heights. The region (b) is electron and pion veto by C1 and C2. The right-hand plots are plots of the time-of-flight vs. track momentum for events inside the boxes labeled (a) and (b) in the left-hand plot. The pair of plots on the right are TOF at H3 as a function of momentum with C1 and C2 cuts. The curves show $\pm$2.5 sigma of TOF resolution from the peak. Particles between the curves are selected.$ Show more plots

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