Correlated production of p and p bar in Au +Au collisions at √{sNN}=200 GeV
Abstract
Correlations between p and pbar at transverse momenta typical of enhanced baryon production in Au + Au collisions are reported. The PHENIX experiment has measured same and opposite sign baryon pairs in Au + Au collisions at √{sNN} = 200 GeV. Correlated production of p and pbar with the trigger particle from the range 2.5 <pT < 4.0 GeV / c and the associated particle with 1.8 <pT < 2.5 GeV / c is observed to be nearly independent of the centrality of the collisions. Same sign pairs show no correlation at any centrality. The conditional yield of mesons triggered by baryons (and anti-baryons) and mesons in the same pT range rises with increasing centrality, except for the most central collisions, where baryons show a significantly smaller number of associated mesons. These data are consistent with a picture in which hard scattered partons produce correlated p and pbar in the pT region of the baryon excess.
- Publication:
-
Physics Letters B
- Pub Date:
- June 2007
- DOI:
- 10.1016/j.physletb.2007.04.029
- arXiv:
- arXiv:nucl-ex/0611016
- Bibcode:
- 2007PhLB..649..359A
- Keywords:
-
- Nuclear Experiment
- E-Print:
- 420 authors from 58 institutions, 21 pages,5 figures. Submitted to Physics Letters B. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html