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Lambda-p femtoscopy in collisions of Ar + KCl at 1.76AGeV

AuthorsHADES Collaboration; Díaz Medina, José ; Gil Ortiz, Alejandro; Agakishiev, G.; Ramstein, B.
Issue Date18-Aug-2010
PublisherAmerican Physical Society
CitationPhysical Review - Section C - Nuclear Physics 82 (2): 021901 (2010)
AbstractResults on Lambda p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76AGeV, the reaction Ar + KCl was studied with the High Acceptance Di-Electron Spectrometer ( HADES) at SIS18/GSI. A high-statistics and high-purity Lambda sample was collected, allowing for the investigation of Lambda p correlations at low relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent of the Lambda p emission source. The Lambda p source radius is found to be slightly smaller than the pp correlation radius for a similar collision system. The present Lambda p radius is significantly smaller than that found for Au + Au/Pb + Pb collisions in the AGS, SPS, and RHIC energy domains but larger than that observed for electroproduction from He. Taking into account all available data, we find the Lambda p source radius to increase almost linearly with the number of participants to the power of one-third.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.82.021901
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