Back B B, Baker M D, Ballintijn M, Barton D S, Becker B, Betts R R, Bickley A A, Bindel R, Busza W, Carroll A, Decowski M P, García E, Gburek T, George N, Gulbrandsen K, Gushue S, Halliwell C, Hamblen J, Harrington A S, Henderson C, Hofman D J, Hollis R S, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane J L, Khan N, Kulinich P, Kuo C M, Lee J W, Lin W T, Manly S, Mignerey A C, Nouicer R, Olszewski A, Pak R, Park I C, Pernegger H, Reed C, Roland C, Roland G, Sagerer J, Sarin P, Sedykh I, Skulski W, Smith C E, Steinberg P, Stephans G S F, Sukhanov A, Tonjes M B, Trzupek A, Vale C, Van Nieuwenhuizen G J, Verdier R, Veres G I, Wolfs F L H, Wosiek B, Woźniak K, Wysłouch B, Zhang J
Argonne National Laboratory, Argonne, Illinois 60439-4843, USA.
Phys Rev Lett. 2004 Aug 20;93(8):082301. doi: 10.1103/PhysRevLett.93.082301. Epub 2004 Aug 16.
The measured pseudorapidity distribution of primary charged particles in minimum-bias d+Au collisions at sqrt[s(NN)]=200 GeV is presented for the first time. This distribution falls off less rapidly in the gold direction as compared to the deuteron direction. The average value of the charged particle pseudorapidity density at midrapidity is <dN(ch)/d eta>|eta|< or =0.6)=9.4+/-0.7(syst) and the integrated primary charged particle multiplicity in the measured region is 82+/-6(syst). Estimates of the total charged particle production, based on extrapolations outside the measured pseudorapidity region, are also presented. The pseudorapidity distribution, normalized to the number of participants in d+Au collisions, is compared to those of Au+Au and p+(-)p systems at the same energy. The d+Au distribution is also compared to the predictions of the parton saturation model, as well as microscopic models.
首次给出了在(\sqrt{s(NN)} = 200) GeV下最小偏置(d + Au)碰撞中初带电粒子的赝快度分布测量结果。与氘核方向相比，该分布在金核方向下降得没那么快。在中快度处带电粒子赝快度密度的平均值为(\langle dN(ch)/d\eta\rangle|\eta|\leq0.6 = 9.4\pm0.7)（系统误差），测量区域内初带电粒子多重数的积分值为(82\pm6)（系统误差）。还给出了基于测量赝快度区域外外推得到的总带电粒子产生的估计值。将归一化到(d + Au)碰撞参与者数量的赝快度分布与相同能量下(Au + Au)和(p + (-)p)系统的分布进行了比较。(d + Au)分布还与部分子饱和模型以及微观模型的预测进行了比较。
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