Česky
English
Committee for collaboration of Czech Republic

with Joint Institute for Nuclear Research in Dubna Login
Global and local polarization of A hyperons in Au plus Au collisions at 200 GeV from STAR

Author
Adamczyk L. AGH University of Science and Technology, Poland
Lednický Richard, promovaný fyzik DrSc. dr. h. c. Institute of physics of the ASCR, JINR Dubna
et al.  different institutions

Year
2019

Scientific journal
NUCLEAR PHYSICS A 982 511-514

Web


Abstract
New results on global polarization of A hyperons in Au+Au collisions at root s(NN) = 200 GeV reveal non-zero signal on the order of a few tenths of a percent. Compared with lower energy results, the current measurement shows that the polarization decreases at higher collision energy, the trend being well reproduced by theoretical calculations. The polarization is found to be larger in more peripheral collisions, as well as in the in-plane than in the out-of-plane direction. The signal seems to depend on the asymmetry between positive and negative charge in each event, which may indicate an influence of the axial current induced by the magnetic field. In addition, the first measurement of a local polarization along the beam direction was performed. The results show a quadrupole modulation relative to the second-order event plane, as expected from the elliptic flow.

Cite article as:
L. Adamczyk, R. Lednický, . et al., "Global and local polarization of A hyperons in Au plus Au collisions at 200 GeV from STAR", NUCLEAR PHYSICS A 982 511-514 (2019)