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arxiv: 1009.1747 · v2 · pith:QU43AJRUnew · submitted 2010-09-09 · ⚛️ nucl-ex

Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN SPS

T. Anticic , B. Baatar , D. Barna , J. Bartke , H. Beck , L. Betev , H. Bialkowska , C. Blume
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M. Bogusz B. Boimska J. Book M. Botje P. Buncic T. Cetner P. Christakoglou P. Chung O. Chvala J.G. Cramer V. Eckardt Z. Fodor P. Foka V. Friese M. Gazdzicki K. Grebieszkow C. H\"ohne K. Kadija A. Karev V.I. Kolesnikov M. Kowalski D. Kresan A. Laszlo R. Lacey M. van Leeuwen M. Mackowiak M. Makariev A.I. Malakhov M. Mateev G.L. Melkumov M. Mitrovski S. Mrowczynski V. Nicolic G. P\'alla A.D. Panagiotou W. Peryt J. Pluta D. Prindle F. P\"uhlhofer R. Renfordt C. Roland G. Roland M. Rybczy\'nski A. Rybicki A. Sandoval N. Schmitz T. Schuster P. Seyboth F. Sikler E. Skrzypczak M. Slodkowski G. Stefanek R. Stock H. Strobele T. Susa M. Szuba M. Utvic D. Varga M. Vassiliou G.I. Veres G. Vesztergombi D. Vranic Z. W{\l}odarczyk A. Wojtaszek-Szwarc
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keywords centralityrapiditymasstransverseaveragecollisioncollisionsdependences
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The yields of (anti-)protons were measured by the NA49 Collaboration in centrality selected Pb+Pb collisions at 40A GeV and 158A GeV. Particle identification was obtained in the laboratory momentum range from 5 to 63 GeV/c by the measurement of the energy loss dE/dx in the TPC detector gas. The corresponding rapidity coverage extends 1.6 units from mid-rapidity into the forward hemisphere. Transverse mass spectra, the rapidity dependences of the average transverse mass, and rapidity density distributions were studied as a function of collision centrality. The values of the average transverse mass as well as the midrapidity yields of protons when normalized to the number of wounded nucleons show only modest centrality dependences. In contrast, the shape of the rapidity distribution changes significantly with collision centrality, especially at 40A GeV. The experimental results are compared to calculations of the HSD and UrQMD transport models.

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    Mean transverse momentum fluctuations in baryon-rich matter are driven by energy and baryon density variations, remain robust to baryon diffusion, and show splitting between protons and antiprotons.