Charged-particle multiplicity near midrapidity in central Au+Au collisions at sqrt[SNN]=56 and 130 GeV.

Back B B,Baker M D,Barton D S,Basilev S,Bates B D,Baum R,Betts R R,Białas A,Bindel R,Bogucki W,Budzanowski A,Busza W,Carroll A,Ceglia M,Chang Y H,Chen A E,Coghen T,Conner C,Czyz W,Dabrowski B,Decowski M P,Despet M,Fita P,Fitch J,Friedl M,Gałuszka K,Ganz R,Garcia E,George N,Godlewski J,Gomes C,Griesmayer E,Gulbrandsen K,Gushue S,Halik J,Halliwell C,Haridas P,Hayes A,Heintzelman G A,Henderson C,Hollis R,Hołyński R,Holzman B,Johnson E,Kane J,Katzy J,Kita W,Kotuła J,Kraner H,Kucewicz W,Kulinich P, LawV C,Lemler M,Ligocki J,Lin W T,Manly S,McLeod D,Michałowski J,Mignerey A,Mülmenstädt J,Neal M,Nouicer R,Olszewski A,Pak R,Park I C,Patel M,Pernegger H,Plesko M,Reed C,Remsberg L P,Reuter M,Roland C,Roland G,Ross D,Rosenberg L,Ryan J,Sanzgiri A,Sarin P,Sawicki P,Scaduto J,Shea J,Sinacore J,Skulski W,Steadman S G,Stephans G S,Steinberg P,Straczek A,Stodulski M,Strek M,Stopa Z,Sukhanov A,Surowiecka K,Tang J L,Teng R,Trzupek A,Vale C,van Nieuwenhuizen G J,Verdier R,Wadsworth B,Wolfs F L,Wosiek B,Woźniak K,Wuosmaa A H,Wysłouch B,Zalewski K,Zychowski P, Null Null

Physical review letters（2000）

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摘要

We present the first measurement of pseudorapidity densities of primary charged particles near midrapidity in Au+Au collisions at sqrt[s(NN)] = 56 and 130 GeV. For the most central collisions, we find the charged-particle pseudorapidity density to be dN/deta|(|eta|<1) = 408+/-12(stat)+/-30(syst) at 56 GeV and 555+/-12(stat)+/-35(syst) at 130 GeV, values that are higher than any previously observed in nuclear collisions. Compared to proton-antiproton collisions, our data show an increase in the pseudorapidity density per participant by more than 40% at the higher energy.

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