Λ-Hyperon Global Polarization in Au+Au Collisions at RHIC

Selyuzhenkov

Chinese Physics C> 2007, Vol. 31> Issue(12) : 1185-1188

Λ-Hyperon Global Polarization in Au+Au Collisions at RHIC

Selyuzhenkov ^,

Wayne State University, 666 W Hancock, Detroit MI 48201, USA

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Abstract：
We present the Λ-hyperon global polarization in Au+Au collisions at s_NN=62GeV and 200GeV measured with the STAR detector at RHIC. The observed Λ-hyperon global polarization is consistent with zero, what is in agreement with recent measurements of Λ global polarization, as well as φ(1020) and K^*0(892) vector mesons spin alignment with respect to the reaction plane. The possible dependence of the global polarization on relative azimuthal angle between the orbital momentum of the system and the hyperon 3-momentum is discussed. The corresponding systematic uncertainty due to detector acceptance is found to be less than 20%.

References

[1]

. LIANG Z T, WANG X N. Phys. Rev. Lett., 2005, 94:102301; Erratum: ibid. 2006, 96: 0399012. Voloshin S A. arXiv:nucl-th/04100893. LIANG Z T, WANG X N. Phys. Lett., 2005, B629: 204. GAO Jian-Hua, LIANG Z T. Talk at International Work-shop on “Hadron Physics and Property of High Baryon Density Matter". November 24, 2006, Xi'an, China5. Selyuzhenkov I (STAR Collaboration). Rom. Rep. Phys.,2006, 58: 0496. Selyuzhenkov I (STAR Collaboration). J. Phys., 2006,G32: S5577. CHEN J H (STAR Collaboration). Talk at QM2006 November 13, 2006, Shanghai, China8. Eidelman S et al. (Particle Data Group). Phys. Lett., 2004,B592: 19. Anderson M et al. Nucl. Instrum. Methods, 2003, A499:65910. Voloshin S, ZHANG Y. Z. Phys., 1996, C70: 665.arXiv:hep-ph/940728211. Poskanzer A M, Voloshin S A. Phys. Rev., 1998, C58: 167112. Ackermann K H et al. (STAR Collaboration). Nucl. Instrum. Methods, 2003, A499: 71313. Selyuzhenkov I (STAR Collaboration). AIP Conf. Proc.,2006, 870: 712

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Selyuzhenkov. Λ-Hyperon Global Polarization in Au+Au Collisions at RHIC[J]. Chinese Physics C, 2007, 31(12): 1185-1188.

Selyuzhenkov. Λ-Hyperon Global Polarization in Au+Au Collisions at RHIC[J]. Chinese Physics C, 2007, 31(12): 1185-1188. shu

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Received: 2007-07-17
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Λ-Hyperon Global Polarization in Au+Au Collisions at RHIC

Selyuzhenkov ^,

Corresponding author: Selyuzhenkov,

Wayne State University, 666 W Hancock, Detroit MI 48201, USA

Received Date: 2007-07-17
Accepted Date: 1900-01-01
Available Online: 2007-12-05

Abstract: We present the Λ-hyperon global polarization in Au+Au collisions at s_NN=62GeV and 200GeV measured with the STAR detector at RHIC. The observed Λ-hyperon global polarization is consistent with zero, what is in agreement with recent measurements of Λ global polarization, as well as φ(1020) and K^*0(892) vector mesons spin alignment with respect to the reaction plane. The possible dependence of the global polarization on relative azimuthal angle between the orbital momentum of the system and the hyperon 3-momentum is discussed. The corresponding systematic uncertainty due to detector acceptance is found to be less than 20%.