Observation of Global Hyperon Polarization in Ultrarelativistic Heavy-Ion Collisions

0481340 - ÚJF 2018 RIV NL eng J - Článek v odborném periodiku
Upsal, I. - Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Vértési, Robert … celkem 341 autorů
Observation of Global Hyperon Polarization in Ultrarelativistic Heavy-Ion Collisions.
Nuclear Physics. A. Roč. 967, č. 11 (2017), s. 760-763. ISSN 0375-9474. E-ISSN 1873-1554
Grant CEP: GA MŠMT LG15001; GA MŠMT LM2015054
Institucionální podpora: RVO:61389005
Klíčová slova: STAR collaboration * heavy ion collisions * quark-gluon plasma
Obor OECD: Nuclear physics
Impakt faktor: 1.992, rok: 2017

Collisions between heavy nuclei at ultra-relativistic energies form a color-deconfined state of matter known as the quark-gluon plasma. This state is well described by hydrodynamics, and non-central collisions are expected to produce a fluid characterized by strong vorticity in the presence of strong external magnetic fields. The STAR Collaboration at Brookhaven National Laboratory's Relativistic Heavy Ion Collider (RHIC) has measured collisions between gold nuclei at center of mass energies root S-NN = 7.7 200 GeV. We report the first observation of globally polarized A and A hyperons, aligned with the angular momentum of the colliding system. These measurements provide important information on partonic spin-orbit coupling, the vorticity of the quark-gluon plasma, and the magnetic field generated in the collision.
Trvalý link: http://hdl.handle.net/11104/0276918