Abstract
Transverse momentum spectra up to around midrapidity of , and in reactions were measured at by the CERN-NA49 experiment. The nuclear modification factors for and for were extracted and compared with results obtained at the BNL Relativistic Heavy Ion Collider (RHIC) at . The modification factor 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 , in which the contribution of the Cronin effect is reduced, shows a saturation well below unity in the channel. The extracted values follow the RHIC results closely in the available transverse momentum range, except for above transverse momentum. There the measured suppression is smaller than that observed at RHIC.
5 More- Received 6 November 2007
DOI:https://doi.org/10.1103/PhysRevC.77.034906
©2008 American Physical Society