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

G. Agakishiev , A. Balanda , R. Bassini , D. Belver , A.V. Belyaev , A. Blanco , M. B\"ohmer , J.L. Boyard

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P. Braun-Munzinger P. Cabanelas E. Castro S. Chernenko T. Christ M. Destefanis J. D\'iaz F. Dohrmann A. Dybczak T. Eberl L. Fabbietti O.V. Fateev P. Finocchiaro P. Fonte J. Friese I. Fr\"ohlich T. Galatyuk J.A. Garz\'on R. Gernh\"auser A. Gil C. Gilardi M. Golubeva D. Gonz\'alez-D\'iaz F. Guber T. Hennino R. Holzmann I. Iori A. Ivashkin M. Jurkovic B. K\"ampfer K. Kanaki T. Karavicheva D. Kirschner I. Koenig W. Koenig B.W. Kolb R. Kotte F. Krizek R. Kr\"ucken W. K\"uhn A. Kugler A. Kurepin S. Lang J.S. Lange K. Lapidus T. Liu L. Lopes M. Lorenz L. Maier A. Mangiarotti J. Markert V. Metag B. Michalska J. Michel D. Mishra E. Morini\`ere J. Mousa C. M\"untz L. Naumann J. Otwinowski Y.C. Pachmayer M. Palka Y. Parpottas V. Pechenov O. Pechenova J. Pietraszko W. Przygoda B. Ramstein A. Reshetin M. Roy-Stephan A. Rustamov A. Sadovsky B. Sailer P. Salabura A. Schmah Yu.G. Sobolev S. Spataro B. Spruck H. Str\"obele J. Stroth C. Sturm M. Sudol A. Tarantola K. Teilab P. Tlusty M. Traxler R. Trebacz H. Tsertos V. Wagner M. Weber C. Wendisch M. Wisniowski T. Wojcik J. W\"ustenfeld S. Yurevich Y.V. Zanevsky P. Zhou P. Zumbruch

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keywords lambdaradiusenergysourceallowingcorrelationfemtoscopyfound

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Results on $\Lambda$p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76A~GeV, 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 small 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 slightly smaller than the pp correlation radius for a similar collis ion system. The present $\Lambda$p radius is significantly smaller than that found for Au+Au/Pb+Pb collisio ns 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.

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

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