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Report No.

Measurement of $$Upsilon(1S+2S+3S)$$ production in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Imai, Kenichi; Tanida, Kiyoshi  ; PHENIX Collaboration*; 504 of others*

Measurements of bottomonium production in heavy-ion and $$p+p$$ collisions at the Relativistic Heavy Ion Collider (RHIC) are presented. The inclusive yield of the three $$Upsilon$$ states, $$Upsilon(1S+2S+3S)$$, was measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au+Au and $$p+p$$ collisions at $$sqrt{s_{NN}} = 200$$ GeV. The $$Upsilon(1S+2S+3S) to e^+e^-$$ differential cross section at midrapidity was found to be $$B_{ee}dsigma/dy = 108 pm 38({rm stat.}) pm 15 ({rm syst.}) pm 11 ({rm luminosity})$$ pb in $$p+p$$ collisions. The nuclear modification factor in the 30% most central Au+Au collisions indicates a suppression of the total $$Upsilon$$ state yield relative to the extrapolation from $$p+p$$ collision data. The suppression is consistent with measurements made by STAR at RHIC and at higher energies by the CMS experiment at the Large Hadron Collider.



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Category:Physics, Nuclear



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