Spin alignment measurements of the K*o(892) and φ(1020) vector mesons in heavy ion collisions at √sNN=200 GeV

B.I. Abelev; Y. Bai; F. Benedosso; M.A.J. Botje; E Braidot; O. Grebenyuk; A. Mischke; T. Peitzmann; M.J. Russcher; R.J.M. Snellings; N. van der Kolk; M. van Leeuwen

Spin alignment measurements of the K*o(892) and φ(1020) vector mesons in heavy ion collisions at √sNN=200 GeV

B.I. Abelev, Y. Bai, F. Benedosso, M.A.J. Botje, E Braidot, O. Grebenyuk, A. Mischke, T. Peitzmann, M.J. Russcher, R.J.M. Snellings, N. van der Kolk, M. van Leeuwen

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Abstract

We present the first spin alignment measurements for the K 0(892) and (1020) vector mesons produced at mid-rapidity with transverse momenta up to 5GeV/c at √sNN = 200GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are 00 = 0.32 ± 0.04 (stat) ± 0.09 (syst) for the K 0 (0.8 <pT <5.0 GeV/c) and 00 = 0.34 ± 0.02 (stat) ± 0.03 (syst) for the (0.4 <pT <5.0 GeV/c), and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector meson spins. Spin alignments for K 0 and in Au+Au collisions were also measured with respect to the particle’s production plane.

Original language	Undefined/Unknown
Pages (from-to)	061902
Number of pages	7
Journal	Physical Review. C, Nuclear physics
Volume	77
Publication status	Published - 2008

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Cite this

@article{cd51665206b64f489be104f934cd2128,

title = "Spin alignment measurements of the K*o(892) and φ(1020) vector mesons in heavy ion collisions at √sNN=200 GeV",

abstract = "We present the first spin alignment measurements for the K 0(892) and (1020) vector mesons produced at mid-rapidity with transverse momenta up to 5GeV/c at √sNN = 200GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are 00 = 0.32 ± 0.04 (stat) ± 0.09 (syst) for the K 0 (0.8 <pT <5.0 GeV/c) and 00 = 0.34 ± 0.02 (stat) ± 0.03 (syst) for the (0.4 <pT <5.0 GeV/c), and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector meson spins. Spin alignments for K 0 and in Au+Au collisions were also measured with respect to the particle{\textquoteright}s production plane.",

author = "B.I. Abelev and Y. Bai and F. Benedosso and M.A.J. Botje and E Braidot and O. Grebenyuk and A. Mischke and T. Peitzmann and M.J. Russcher and R.J.M. Snellings and {van der Kolk}, N. and {van Leeuwen}, M.",

year = "2008",

language = "Undefined/Unknown",

volume = "77",

pages = "061902",

journal = "Physical Review. C, Nuclear physics",

issn = "0556-2813",

publisher = "American Physical Society",

}

TY - JOUR

T1 - Spin alignment measurements of the K*o(892) and φ(1020) vector mesons in heavy ion collisions at √sNN=200 GeV

AU - Abelev, B.I.

AU - Bai, Y.

AU - Benedosso, F.

AU - Botje, M.A.J.

AU - Braidot, E

AU - Grebenyuk, O.

AU - Mischke, A.

AU - Peitzmann, T.

AU - Russcher, M.J.

AU - Snellings, R.J.M.

AU - van der Kolk, N.

AU - van Leeuwen, M.

PY - 2008

Y1 - 2008

N2 - We present the first spin alignment measurements for the K 0(892) and (1020) vector mesons produced at mid-rapidity with transverse momenta up to 5GeV/c at √sNN = 200GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are 00 = 0.32 ± 0.04 (stat) ± 0.09 (syst) for the K 0 (0.8 <pT <5.0 GeV/c) and 00 = 0.34 ± 0.02 (stat) ± 0.03 (syst) for the (0.4 <pT <5.0 GeV/c), and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector meson spins. Spin alignments for K 0 and in Au+Au collisions were also measured with respect to the particle’s production plane.

AB - We present the first spin alignment measurements for the K 0(892) and (1020) vector mesons produced at mid-rapidity with transverse momenta up to 5GeV/c at √sNN = 200GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are 00 = 0.32 ± 0.04 (stat) ± 0.09 (syst) for the K 0 (0.8 <pT <5.0 GeV/c) and 00 = 0.34 ± 0.02 (stat) ± 0.03 (syst) for the (0.4 <pT <5.0 GeV/c), and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector meson spins. Spin alignments for K 0 and in Au+Au collisions were also measured with respect to the particle’s production plane.

M3 - Article

SN - 0556-2813

VL - 77

SP - 061902

JO - Physical Review. C, Nuclear physics

JF - Physical Review. C, Nuclear physics

ER -