Semihard scattering unraveled from collective flow at the SPS期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

Semihard scattering unraveled from collective flow at the SPS

Authors:	J Bielcikova

Institution:	J. Bielcikova and The CERES/NA45 Collaboration

Abstract:	A study of elliptic flow and two-particle azimuthal correlations of charged particles ( $0.5 < p_{{\text{T}}} < 2.5$ GeV/c) and high- $p_{\rm T}$ pions ( $1.2 < p_{{\text{T}}} < 3.5$ GeV/c) in Pb + Au collisions at 158A GeV/c, close to midrapidity, is presented. Elliptic flow (v ₂) rises linearly with $p_{\rm T}$ to a value of about 10 $\%$ at 2 GeV/c. Beyond $p_{\rm T}\approx$ 1.5 GeV/c, the slope decreases and possibly indicates a v ₂ saturation at high $p_{\rm T}$ . Two-pion azimuthal anisotropies for $p_{\rm T} >$ 1.2 GeV/c exceed the v ₂ values by about 60 $\%$ in semicentral collisions. This non-flow component is attributed to near-side and away-side jetlike correlations. While the near-side peak remains constant with centrality 0.23 $\pm$ 0.03 rad, as expected for fragmentation, the away-side peak experiences broadening and disappears in central collisions. Arrival of the final proofs: 30 June 2005 PACS: 25.75.Ld, 25.75.Gz

Keywords:
本文献已被 SpringerLink 等数据库收录！