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Two-component source to explain $\Lambda \,{\rm{and}}\,\bar{\Lambda }$ global polarization in non-central heavy-ion collisions

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, , Citation A Ayala et al 2020 J. Phys.: Conf. Ser. 1602 012032 DOI 10.1088/1742-6596/1602/1/012032

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1 Institute de Ciencias Nucleares, Universidad Nacionál Autónoma de México, Apartado Postal 70-543, CdMx 04510, Mexico

2 Centre for Theoretical and Mathematical Physics, and Department of Physics, University of Cape Town, Rondebosch 7700, South Africa

3 Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Sinaloa, Avenida de las Américas y Boulevard Universitarios, Ciudad Universitaria, C.P. 80000, Culiacán, Sinaloa, Mexico

4 Facultad de Ciencias - CUICBAS, Universidad de Colima, Bernal Díaz del Castillo No. 340, Col. Villas San Sebastián, 28045 Colima, Mexico

5 Departamento de Física, Universidad de Sonora, Boulevard Luis Encinas J. y Rosales, Colonia Centro, Hermosillo, Sonora 83000, Mexico

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1742-6596/1602/1/012032

Abstract

The STAR Beam Energy Scan program has found a difference in the global polarization of ${\Lambda }$s and $\bar{\Lambda }$s produced in Au + Au collisions. This difference is larger for lower center of mass collision energies. In this work we show that a two-component source, consisting of a high density core and a lower density corona, can describe quantitatively the $\Lambda \,{\rm{and}}\,\bar{\Lambda }$ polarizations as a function of collision energy.

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10.1088/1742-6596/1602/1/012032