Proton-Λ correlations in central Pb+Pb collisions at sNN=17.3 GeV
Abstract
The momentum correlation between protons and Λ particles emitted from central Pb+Pb collisions at sNN=17.3 GeV was studied by the NA49 experiment at the CERN Super Proton Synchrotron. A clear enhancement is observed for small relative momenta (qinv<0.2 GeV). By fitting a theoretical model, which uses the strong interaction between the proton and the Λ 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 RG=3.02±0.20(stat.)-0.16+0.44(syst.) fm.
- Publication:
-
Physical Review C
- Pub Date:
- May 2011
- DOI:
- 10.1103/PhysRevC.83.054906
- arXiv:
- arXiv:1103.3395
- Bibcode:
- 2011PhRvC..83e4906A
- Keywords:
-
- 25.75.Gz;
- Particle correlations;
- Nuclear Experiment;
- High Energy Physics - Phenomenology
- E-Print:
- 14 pages, 9 figures, submitted to Phys. Rev. C