Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00509894" target="_blank" >RIV/61389005:_____/19:00509894 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/19:00337234
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.123.132301" target="_blank" >https://doi.org/10.1103/PhysRevLett.123.132301</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.123.132301" target="_blank" >10.1103/PhysRevLett.123.132301</a>

Result language
angličtina
Original language name
Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV
Original language description
The Lambda ((Lambda) over bar) hyperon polarization along the beam direction has been measured in Au + Au collisions at root S-NN = 200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a second harmonic sine modulation, indicating a quadrupole pattern of the vorticity component along the beam direction, expected due to elliptic flow. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p(T)) dependence at p(T) greater than 1 GeV/c. The magnitude of the signal is about 5 times smaller than those predicted by hydrodynamic and multiphase transport models. The observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, the kinematic vorticity calculations in the blast-wave model tuned to reproduce particle spectra, elliptic flow, and the azimuthal dependence of the Gaussian source radii measured with the Hanbury Brown-Twiss intensity interfemmetry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)