# Correlated Production of p and $\bar{p}$ in Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV

Abstract : Correlations between p and pbar's at transverse momenta typical of enhanced baryon production in Au+Au collisions are reported. The PHENIX experiment measures same and opposite sign baryon pairs in Au+Au collisions at sqrt(s_NN) = 200 GeV. Correlated production of p and p^bar with the trigger particle from the range 2.5 < p_T < 4.0 GeV/c and the associated particle with 1.8 < p_T < 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 p^bar in the p_T region of the baryon excess.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00118194
Contributor : Dominique Girod <>
Submitted on : Monday, December 4, 2006 - 1:50:13 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:07 PM

### Citation

A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Correlated Production of p and $\bar{p}$ in Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV. Physics Letters B, Elsevier, 2007, 649, pp.359-369. ⟨10.1016/j.physletb.2007.04.029⟩. ⟨in2p3-00118194⟩

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