Core meets corona: A two-component source to explain Λ and Λ‾ global polarization in semi-central heavy-ion collisions

Autor: P. A. Nieto-Marín, Marco Alberto Ayala Torres, Isabel Dominguez, Eleazar Cuautle, Luis Valenzuela-Cázares, Jordi Salinas, M. Rodríguez-Cahuantzi, Ivonne Maldonado, E. Moreno-Barbosa, Marcos Aurelio Fontaine Sanchez, Alejandro Ayala, Maria Elena Tejeda-Yeomans
Rok vydání: 2020
Předmět:
Zdroj: Physics Letters B. 810:135818
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2020.135818
Popis: We compute the Λ and Λ ‾ 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 Λs than Λ ‾ s are produced in the corona, and this is combined with a smaller number of Λs coming from the core, as compared to those coming from the corona, an amplification effect for the Λ ‾ with respect to that of Λ polarization can occur. This amplification becomes more important for lower collision energies and quantitatively accounts for the Λ and Λ ‾ polarizations measured by the STAR beam energy scan.
Databáze: OpenAIRE