Correlated Production of p and p{overbar} in Au + Au Collisions at sqrt(s_NN) = 200 GeV

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physics Letters B

OSTI ID:931513

Awes, Terry C ^[1]; Batsouli, Sotiria ^[2]; Cianciolo, Vince ^[1]; Efremenko, Yuri ^[2]; Plasil, F ^[1]; Read, Jr, Kenneth F ^[1]; Silvermyr, David O ^[1]; Sorensen, Soren P ^[3]; Stankus, Paul W ^[1]; Young, Glenn R ^[1]; Zhang, Chun ^[2]

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1. ORNL
2. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
3. University of Tennessee, Knoxville (UTK)

Correlations between p and {bar p} 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 {radical}s{sub NN} = 200 GeV. Correlated production of p and {bar p} with the trigger particle from the range 2.5<p{sub T}<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 {bar p} in the p{sub T} region of the baryon excess.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931513
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Journal Issue: 5-6 Vol. 649; ISSN PYLBAJ; ISSN 0370-2693
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ATOM-ATOM COLLISIONS
BARYONS
GOLD
MESONS
PRODUCTION