2007/11/30 by NA49 Collaboration, C. Alt, T. Anticic +98
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevc.77.034906
published as Phys.Rev.C77:034906,2008 · 12 pages, 12 figures
arxiv created 2008/03/28 · openalex publication_date 2008/03/28 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Transverse momentum spectra up to 4.5\phantom\rule0.3em0exGeV/c around midrapidity of \ensuremathπ^\ifmmode±\else\textpm\fi,p,p, and K^\ifmmode±\else\textpm\fi in Pb+Pb reactions were measured at √s_NN=17.3\phantom\rule0.3em0exGeV by the CERN-NA49 experiment. The nuclear modification factors RAA for \ensuremathπ^\ifmmode±\else\textpm\fi and RCP for \ensuremathπ^\ifmmode±\else\textpm\fi,p,p,K^\ifmmode±\else\textpm\fi were extracted and compared with results obtained at the BNL Relativistic Heavy Ion Collider (RHIC) at √s_NN=200\phantom\rule0.3em0exGeV. The modification factor RAA shows a rapid increase with transverse momentum in the covered region. This indicates that the Cronin effect is the dominating effect in our energy range. The modification factor RCP, in which the contribution of the Cronin effect is reduced, shows a saturation well below unity in the \ensuremathπ^\ifmmode±\else\textpm\fi channel. The extracted RCP values follow the 200\phantom\rule0.3em0exGeV RHIC results closely in the available transverse momentum range, except for \ensuremathπ^\ifmmode±\else\textpm\fi above 2.5\phantom\rule0.3em0exGeV/c transverse momentum. There the measured suppression is smaller than that observed at RHIC.