Chinese Physics C > 2007, Vol. 31 > Issue(12): 1192-1195

Spin Alignment of Vector Mesons K^*0(892) and φ(1020) in Au+Au and p+p Collsions at s_NN=200GeV

TANG Ze-Bo^,

Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

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Abstract：
We present the preliminary results on the spin alignment matrix element ρ ₀₀for vector mesons K ^*0(892) and φ(1020) in mid-central (20%—60%) Au+Au and p+p collisions at s _NN=200GeV. The values of ρ ₀₀with respect to reaction plane in Au+Au collisions are 0.36±0.02(stat)±0.13(sys) for K ^*0(892) and 0.38±0.01 (stat)±0.04 (sys) for φ(1020). No evident global spin alignment with respect to reaction plane is observed in the measured p _Tregion up to 5GeV/c with current sensitivity. ρ ₀₀with respect to the production plane of the vector meson is also measured for K ^*0(892) and φ(1020) in Au+Au collisions, and for φ(1020) in p+p collisions. No significant difference for the ρ ₀₀between Au+Au and p+p collisions is observed with our data sample.

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. LIANG Z T, WANG X N. Phys. Rev. Lett., 2005, 94:1023012. LIANG Z T, WANG X N. Phys. Lett., 2005, B629: 203. Voloshin S A. nucl-th/04100894. Schilling K el al. Nucl. Phys., 1970, B15: 3975. Adams J et al. (STAR Collab.). Phys. Rev., 2005, C71:0649026. Adams J et al. (STAR Collab.). Phys. Lett., 2005, B612:1817. Drijard D et al. Nucl. Instrum. Methods, 1984, A225: 3678. L'Hte D et al. Nucl. Instrum. Methods, 1994, A337: 5449. Adams J et al. (STAR Collab.). Phys. Rev. Lett., 2004, 92:05230210. Poskanzer A M, Voloshin S A. Phys. Rev., 1998, C58: 167111. Bunce G et al. Phys. Rev. Lett., 1976, 36: 111312. Duryea J et al. Phys. Rev. Lett., 1991, 67: 119313. Aleev A N et al. (EXCHARM Collab.). Phys. Lett., 2000,B485: 334

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TANG Ze-Bo. Spin Alignment of Vector Mesons K ^*0(892) and φ(1020) in Au+Au and p+p Collsions at s _NN=200GeV[J]. Chinese Physics C, 2007, 31(12): 1192-1195.

TANG Ze-Bo. Spin Alignment of Vector Mesons K ^*0(892) and φ(1020) in Au+Au and p+p Collsions at s _NN=200GeV[J]. Chinese Physics C, 2007, 31(12): 1192-1195. 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

Spin Alignment of Vector Mesons K^*0(892) and φ(1020) in Au+Au and p+p Collsions at s_NN=200GeV

TANG Ze-Bo^,

Corresponding author:TANG Ze-Bo,

Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

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

Abstract:We present the preliminary results on the spin alignment matrix element ρ₀₀for vector mesons K^*0(892) and φ(1020) in mid-central (20%—60%) Au+Au and p+p collisions at s_NN=200GeV. The values of ρ₀₀with respect to reaction plane in Au+Au collisions are 0.36±0.02(stat)±0.13(sys) for K^*0(892) and 0.38±0.01 (stat)±0.04 (sys) for φ(1020). No evident global spin alignment with respect to reaction plane is observed in the measured p_Tregion up to 5GeV/c with current sensitivity. ρ₀₀with respect to the production plane of the vector meson is also measured for K^*0(892) and φ(1020) in Au+Au collisions, and for φ(1020) in p+p collisions. No significant difference for the ρ₀₀between Au+Au and p+p collisions is observed with our data sample.