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Polarization of Λ (Λ¯) Hyperons along the Beam Direction in Au+Au Collisions at sNN=200  GeV

Adam, J

Physical review letters, 2019-09, Vol.123 (13) [Periódico revisado por pares]

College Park: American Physical Society

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  • Título:
    Polarization of Λ (Λ¯) Hyperons along the Beam Direction in Au+Au Collisions at sNN=200  GeV
  • Autor: Adam, J
  • Assuntos: Atomic collisions ; Dependence ; Emission ; Heavy ions ; Hyperons ; Ionic collisions ; Modulation ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Polarization ; Predictions ; Quadrupoles ; Relativistic heavy-ion collisions ; Transverse momentum ; Trigonometric functions ; Vorticity
  • É parte de: Physical review letters, 2019-09, Vol.123 (13)
  • Notas: Ministry of Science and Technology of the People’s Republic of China
    Chinese Academy of Sciences (CAS)
    BNL-211736-2019-JAAM
    Ministry of Education, Youth and Sports of the Czech Republic
    Hungarian National Research, Development and Innovation Office (NRDI)
    National Science Foundation (NSF)
    USDOE Office of Science (SC), Nuclear Physics (NP)
    AC02-05CH11231; SC0015636; SC0012704; SC0017982; FG02-87ER40331
    National Natural Science Foundation of China (NSFC)
    ROSATOM of Russia
    Ministry of Science, Education and Sports of the Republic of Croatia
    Hungarian Ministry of Human Capacities
    National Research Foundation of Korea (NRF)
    Czech Science Foundation (GACR)
    Government of India
    German Federal Ministry of Education and Research (BMBF)
    National Science Centre of Poland (NCN)
    Ministry of Education and Science of the Russian Federation
    Ministry of Education of China
  • Descrição: The Λ (Λ¯) hyperon polarization along the beam direction has been measured in Au+Au collisions at sNN=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 (pT) dependence at pT 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 interferometry technique reproduce well the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the polarization signal.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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