Correlated production of p and (p)over-bar in Au+Au collisions at root s(NN)=200 GeV

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2007-06-14
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Adare, Andrew
Belikov, Sergey
Constantin, Paul
Grau, Nathan
Hill, John
Lajoie, John
Lebedev, Alexandre
Pei, H.
Rak, Jan
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Ogilvie, Craig
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Physics and Astronomy
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Correlations between p and (p) over bar 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 root s(NN) = 200 GeV. Correlated production of p and p 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 p(T) 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) over bar in the p(T) region of the baryon excess.

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This is an article from Nuclear Physics B 649 (2007): 359, doi:10.1016/j.physletb.2007.04.029. Posted with permission.

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Mon Jan 01 00:00:00 UTC 2007
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