Proton-Λ correlations in central Au+Au collisions at VsNN=200 GeV
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Publication date
2006
Authors
Bai, Y.
Botje, M.A.J.
Grebenyuk, O.
Mischke, A.
Peitzmann, T.
Russcher, M.J.
Snellings, R.J.M.
van der Kolk, N.
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Abstract
We report on p-Λ,p-Λ̅ ,p̅ -Λ, and p̅ -Λ̅ correlation functions constructed in central Au-Au collisions at √sNN=200 GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the p-Λ and p̅ -Λ̅ correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The p-Λ̅ and p̅ -Λ correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.
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Bai, Y, Botje, M A J, Grebenyuk, O, Mischke, A, Peitzmann, T, Russcher, M J, Snellings, R J M & van der Kolk, N 2006, 'Proton-Λ correlations in central Au+Au collisions at VsNN=200 GeV', Physical Review. C, Nuclear physics, vol. 74, no. 6, pp. 064906/1-064906/9.