Spin alignment measurements of the k*(0)(892) and phi(1020) vector mesons in heavy ion collisions at root s-nn=200 gev
文献类型：期刊论文
| 作者 | Abelev, B. I.1; Aggarwal, M. M.33; Ahammed, Z.48; Anderson, B. D.21; Arkhipkin, D.14; Averichev, G. S.13; Bai, Y.30,31; Balewski, J.25; Barannikova, O.1; Barnby, L. S.3 |
| 刊名 | Physical review c
 |
| 出版日期 | 2008-06-01 |
| 卷号 | 77期号:6页码:7 |
| ISSN号 | 0556-2813 |
| DOI | 10.1103/physrevc.77.061902 |
| 通讯作者 | Abelev, b. i.() |
| 英文摘要 | We present the first spin alignment measurements for the k*(0)(892) and phi(1020) vector mesons produced at midrapidity with transverse momenta up to 5 gev/c at root s(nn) = 200 gev at rhic. the diagonal spin-density matrix elements with respect to the reaction plane in au+au collisions are rho(00) = 0.32 +/- 0.04 (stat) +/- 0.09 (syst) for the k*(0) (0.8 < p(t) < 5.0 gev/c) and rho(00) = 0.34 +/- 0.02 (stat) +/- 0.03 (syst) for the phi (0.4 < p(t) < 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 phi in au+au collisions were also measured with respect to the particle's production plane. the phi result, rho(00) = 0.41 +/- 0.02 (stat) +/- 0.04 (syst), is consistent with that in p+p collisions, rho(00) = 0.39 +/- 0.03 (stat) +/- 0.06 (syst), also measured in this work. the measurements thus constrain the possible size of polarization phenomena in the production dynamics of vector mesons. |
| WOS关键词 | HYPERON POLARIZATION ; MAGNETIC-MOMENT ; HIGH-ENERGIES ; HADRON-PRODUCTION ; K&P INTERACTIONS ; Z(0) DECAYS ; SIGNATURE ; PROTONS ; PP |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Nuclear |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000257290000007 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175874 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Abelev, B. I. |
| 作者单位 | 1.Univ Illinois, Chicago, IL 60607 USA 2.Argonne Natl Lab, Argonne, IL 60439 USA 3.Univ Birmingham, Birmingham, W Midlands, England 4.Brookhaven Natl Lab, Upton, NY 11973 USA 5.CALTECH, Pasadena, CA 91125 USA 6.Univ Calif Berkeley, Berkeley, CA 94720 USA 7.Univ Calif Davis, Davis, CA 95616 USA 8.Univ Calif Los Angeles, Los Angeles, CA 90095 USA 9.Univ Estadual Campinas, Sao Paulo, Brazil 10.Carnegie Mellon Univ, Pittsburgh, PA 15213 USA |
| 推荐引用方式 GB/T 7714 | Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,et al. Spin alignment measurements of the k*(0)(892) and phi(1020) vector mesons in heavy ion collisions at root s-nn=200 gev[J]. Physical review c,2008,77(6):7. |
| APA | Abelev, B. I..,Aggarwal, M. M..,Ahammed, Z..,Anderson, B. D..,Arkhipkin, D..,...&Zuo, J. X..(2008).Spin alignment measurements of the k*(0)(892) and phi(1020) vector mesons in heavy ion collisions at root s-nn=200 gev.Physical review c,77(6),7. |
| MLA | Abelev, B. I.,et al."Spin alignment measurements of the k*(0)(892) and phi(1020) vector mesons in heavy ion collisions at root s-nn=200 gev".Physical review c 77.6(2008):7. |
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