Core meets corona: a two-component source to explain Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions

We compute the Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions modeling the source as consisting of a high-density core and a less dense corona. We show that when more Lambdas than anti-Lambdas are produced in the corona, and this is combined with a smaller number of...

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Published inarXiv.org
Main Authors Ayala, Alejandro, Ayala Torres, Marco Alberto, Cuautle, Eleazar, Dominguez, Isabel, Fontaine Sanchez, Marcos Aurelio, Maldonado, Ivonne, Moreno-Barbosa, E, Nieto-Marin, P A, Rodriguez-Cahuantzi, M, Salinas, Jordi, Tejeda-Yeomans, Maria Elena, Valenzuela-Cazares, L
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 30.09.2020
Subjects
Amplification
Atomic collisions
Heavy ions
Ionic collisions
Physics - High Energy Physics - Phenomenology
Physics - Nuclear Experiment
Physics - Nuclear Theory
Polarization
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Summary:We compute the Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions modeling the source as consisting of a high-density core and a less dense corona. We show that when more Lambdas than anti-Lambdas are produced in the corona, and this is combined with a smaller number of Lambdas coming from the core, as compared to those coming from the corona, an amplification effect for the anti-Lambda with respect to that of Lambda polarization can occur. This amplification becomes more important for lower collision energies and quantitatively accounts for the Lambda and anti-Lambda polarizations measured by the STAR beam energy scan.
ISSN:2331-8422
DOI:10.48550/arxiv.2003.13757