Hyperon Polarization along the Beam Direction Relative to the Second and Third Harmonic Event Planes in Isobar Collisions at root sNN=200 GeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00373780" target="_blank" >RIV/68407700:21340/23:00373780 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.131.202301" target="_blank" >https://doi.org/10.1103/PhysRevLett.131.202301</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.131.202301" target="_blank" >10.1103/PhysRevLett.131.202301</a>
Alternative languages
Result language
angličtina
Original language name
Hyperon Polarization along the Beam Direction Relative to the Second and Third Harmonic Event Planes in Isobar Collisions at root sNN=200 GeV
Original language description
The polarization of Lambda and (Lambda) over bar hyperons along the beam direction has been measured relative to the second and third harmonic event planes in isobar Ru thorn Ru and Zr thorn Zr collisions at root s(NN) = 200 GeV. This is the first experimental evidence of the hyperon polarization by the triangular flow originating from the initial density fluctuations. The amplitudes of the sine modulation for the second and third harmonic results are comparable in magnitude, increase from central to peripheral collisions, and show a mild p(T) dependence. The azimuthal angle dependence of the polarization follows the vorticity pattern expected due to elliptic and triangular anisotropic flow, and qualitatively disagrees with most hydrodynamic model calculations based on thermal vorticity and shear induced contributions. The model results based on one of existing implementations of the shear contribution lead to a correct azimuthal angle dependence, but predict centrality and pT dependence that still disagree with experimental measurements. Thus, our results provide stringent constraints on the thermal vorticity and shear-induced contributions to hyperon polarization. Comparison to previous measurements at RHIC and the LHC for the second-order harmonic results shows little dependence on the collision system size and collision energy.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LM2023034" target="_blank" >LM2023034: Brookhaven National Laboratory - Participation of the Czech Republic</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
131
Issue of the periodical within the volume
20
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
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UT code for WoS article
001173339200001
EID of the result in the Scopus database
2-s2.0-85178377560