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

doi:10.1103/PhysRevLett.123.132301

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	Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV
	Adam, J ; Adamczyk, L ; Adams, JR ; Adkins, JK ; Agakishiev, G ; Aggarwal, MM ; Ahammed, Z ; Alekseev, I ; Anderson, DM ; Aoyama, R
刊名	PHYSICAL REVIEW LETTERS
	2019
卷号	123 期号:13 页码:-
关键词	QUARK-GLUON PLASMA PERSPECTIVE FLOW
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.123.132301
文献子类	期刊论文
英文摘要	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.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32162]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Rice Univ, Houston, TX 77251 USA; 2.Lehigh Univ, Bethlehem, PA 18015 USA; 3.Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany; 4.Michigan State Univ, E Lansing, MI 48824 USA; 5.Natl Res Nucl Univ MEPhI, Moscow 115409, Russia; 6.HBNI, Natl Inst Sci Educ & Res, Jatni 752050, India; 7.Natl Cheng Kung Univ, Tainan 70101, Taiwan; 8.Nucl Phys Inst CAS, Rez 25068, Czech Republic; 9.Ohio State Univ, Columbus, OH 43210 USA; 10.Inst Nucl Phys PAN, PL-31342 Krakow, Poland;
推荐引用方式 GB/T 7714	Adam, J,Adamczyk, L,Adams, JR,et al. Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV[J]. PHYSICAL REVIEW LETTERS,2019,123(13):-.
APA	Adam, J.,Adamczyk, L.,Adams, JR.,Adkins, JK.,Agakishiev, G.,...&Zyzak, M.(2019).Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV.PHYSICAL REVIEW LETTERS,123(13),-.
MLA	Adam, J,et al."Polarization of Lambda ((Lambda)over-bar) Hyperons along the Beam Direction in Au plus Au Collisions at root S-NN=200 GeV".PHYSICAL REVIEW LETTERS 123.13(2019):-.