Proton-lambda correlations in central Au+Au collisions at sqrt (s_NN)=200 GeV

Abstract

We report on p-Lambda, p-Lambda bar, p bar-Lambda and p bar-Lambda bar correlation functions constructed in central Au-Au collisions at sqrt(s_NN)=200GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the p-Lambda and p bar-Lambda bar correlation functions. They are found to be smaller than the pion source size also measured by the STAR detector. This could be a consequence of the collision fireball's collective expansion. The p-Lambda bar and p bar-Lambda correlations, which are measured for the first time, exhibit a large anti-correlation. 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.

8 pages, 4 figures

References in corpus (6)

• Azimuthal anisotropy in Au+Au collisions at sqrtsNN = 200 GeV
• Identified particle distributions in pp and Au+Au collisions at sqrt{s_NN}=200 GeV
• Observable implications of geometrical and dynamical aspects of freeze-out in heavy ion collisions
• Pion interferometry in Au+Au collisions at $\sqrt{{\mathrm{s}}_{{}_{\mathrm{NN}}}}$ = 200 GeV
• Multi-Strange Baryon Production in Au-Au collisions at sqrt(s_NN) = 130 GeV
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