Proton -- Lambda Correlations in Central Pb+Pb Collisions at sqrt(s_{NN}) = 17.3 GeV

(NA49 Collaboration) 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. Cramer V. Eckardt Z. Fodor P. Foka V. Friese M. Gazdzicki K. Grebieszkow C. Hohne K. Kadija A. Karev V. Kolesnikov M. Kowalski D. Kresan A. Laszlo R. Lacey M. van Leeuwen M.K. Mackowiak M. Makariev A. Malakhov M. Mateev G. Melkumov M. Mitrovski St. Mrowczynski V. Nicolic G. Palla A. Panagiotou W. Peryt J. Pluta D. Prindle F. Puhlhofer R. Renfordt C. Roland G. Roland M. Rybczynski 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. Veres G. Vesztergombi D. Vranic Z. Wlodarczyk A. Wojtaszek-Szwarc

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classification ⚛️ nucl-ex hep-ph

keywords lambdacentralcollisionseffectiveprotonsourcesqrtassuming

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The momentum correlation between protons and lambda particles emitted from central Pb+Pb collisions at sqrt(s_{NN}) = 17.3 GeV was studied by the NA49 experiment at the CERN SPS. A clear enhancement is observed for small relative momenta (q_{inv} < 0.2 GeV). By fitting a theoretical model, which uses the strong interaction between the proton and the lambda in a given pair, to the measured data a value for the effective source size is deduced. Assuming a static Gaussian source distribution we derive an effective radius parameter of R_G = 3.02 \pm 0.20$(stat.)^{+0.44}_{-0.16}(syst.) fm.

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Proton -- Lambda Correlations in Central Pb+Pb Collisions at sqrt(s_{NN}) = 17.3 GeV

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