Polarization of Λ (Λ¯) hyperons along the beam direction in Au+Au collisions at 
sqrt{s_NN} = 200 GeV

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Polarization of Λ (Λ¯) hyperons along the beam direction in Au+Au collisions at sqrt{s_NN} = 200 GeV

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2019). Polarization of Λ (Λ¯) hyperons along the beam direction in Au+Au collisions at sqrt{s_NN} = 200 GeV. Physical Review Letters, 123, 132301. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-282.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D709-F Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D70A-E

Genre: Journal Article

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STAR Collaboration¹, Author
Adam, J.¹, Author
Schmitz, N.¹, Author
Seyboth, P.¹, Author
et al.¹, Author

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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Abstract: The \Lambda (\bar{\Lambda}) hyperon polarization along the beam direction has been measured for the first time in Au+Au collisions at \sqrt{s_{_{NN}}} = 200 GeV. The polarization dependence on the hyperons' emission angle relative to the second-order event plane exhibits a sine modulation, indicating a quadrupole pattern of the vorticity component along the beam direction. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum (p_T) dependence at p_T>1 GeV/c. The magnitude of the signal is about five 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, blast-wave model calculations reproduce the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the signal once the model is required to reproduce the azimuthal dependence of the Gaussian source radii measured via the Hanbury-Brown and Twiss intensity interferometry technique.

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Dates: Date issued: 2019

Publication Status: Issued

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Identifiers: Other: MPP-2019-282
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-282
arXiv: arxiv:1905.11917
URI: https://inspirehep.net/search?p=find+eprint+1905.11917

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Title: Physical Review Letters

Abbreviation : Phys.Rev.Lett.

Source Genre: Journal

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Pages: - Volume / Issue: 123 Sequence Number: - Start / End Page: 132301 Identifier: -