Lambda K femtoscopy in Pb-Pb collisions at root s(NN)=2.76 TeV

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The ALICE Collaboration , Acharya , S , Adamova , D , Kim , D J , Krizek , F , Parkkila , J E , Rak , J , Rytkönen , H M , Räsänen , S , Saarimäki , O A M , Slupecki , M , Trzaska , W H & Zhou , Z 2021 , ' Lambda K femtoscopy in Pb-Pb collisions at root s(NN)=2.76 TeV ' , Physical Review C , vol. 103 , no. 5 , 055201 .

Title: Lambda K femtoscopy in Pb-Pb collisions at root s(NN)=2.76 TeV
Author: The ALICE collaboration; Acharya, S.; Adamova, D.; Kim, D. J.; Krizek, F.; Parkkila, J. E.; Rak, J.; Rytkönen, Heidi Maria; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Trzaska, W. H.; Zhou, Zhipeng
Contributor organization: Helsinki Institute of Physics
Date: 2021-05-05
Language: eng
Number of pages: 23
Belongs to series: Physical Review C
ISSN: 2469-9985
Abstract: The first measurements of the scattering parameters of Lambda K pairs in all three charge combinations (Lambda K+, Lambda K-, and Lambda K-S(0)) are presented. The results are achieved through a femtoscopic analysis of Lambda K correlations in Pb-Pb collisions at root s(NN) = 2.76 TeV recorded by ALICE at the Large Hadron Collider. The femtoscopic correlations result from strong final-state interactions and are fit with a parametrization allowing for both the characterization of the pair emission source and the measurement of the scattering parameters for the particle pairs. Extensive studies with the THERMINATOR 2 event generator provide a good description of the nonfemtoscopic background, which results mainly from collective effects, with unprecedented precision. Furthermore, together with HIJING simulations, this model is used to account for contributions from residual correlations induced by feed-down from particle decays. The extracted scattering parameters indicate that the strong force is repulsive in the Lambda K+ interaction and attractive in the Lambda K- interaction. The data hint that the Lambda K-S(0) interaction is attractive; however, the uncertainty of the result does not permit such a decisive conclusion. The results suggest an effect arising either from different quark-antiquark interactions between the pairs (s (s) over bar in Lambda K+ and u (u) over bar in Lambda K-) or from different net strangeness for each system (S = 0 for Lambda K+, and S = -2 for Lambda K-). Finally, the Lambda K systems exhibit source radii larger than expected from extrapolation from identical particle femtoscopic studies. This effect is interpreted as resulting from the separation in space-time of the single-particle Lambda and K source distributions.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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