Back B B, Baker M D, Ballintijn M, Barton D S, Becker B, Betts R R, Bickley A A, Bindel R, Budzanowski A, 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, Noell A, Nouicer R, Olszewski A, Pak R, Park I C, Pernegger H, Reed C, Remsberg L P, Roland C, Roland G, Sagerer J, Sarin P, Sawicki P, Sedykh I, Skulski W, Smith C E, Steinberg P, Stephans G S F, Sukhanov A, Teng R, Tonjes M B, Trzupek A, Vale C, van Nieuwenhuizen G J, Verdier R, Veres G I, Wadsworth B, Wolfs F L H, Wosiek B, Woźniak K, Wuosmaa A H, Wysłouch B, Zhang J
Argonne National Laboratory, Argonne, Illinois 60439-4943, USA.
Phys Rev Lett. 2003 Aug 15;91(7):072302. doi: 10.1103/PhysRevLett.91.072302.
We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt[s(NN)]=200 GeV. The spectra were obtained for transverse momenta 0.25<p(T)<6.0 GeV/c, in a pseudorapidity range of 0.2<eta<1.4 in the deuteron direction. The evolution of the spectra with collision centrality is presented in comparison to p+pmacr; collisions at the same collision energy. With increasing centrality, the yield at high transverse momenta increases more rapidly than the overall particle density, leading to a strong modification of the spectral shape. This change in spectral shape is qualitatively different from observations in Au+Au collisions at the same energy. The results provide important information for discriminating between different models for the suppression of high-p(T) hadrons observed in Au+Au collisions.
我们测量了在(\sqrt{s(NN)} = 200) GeV的(d + Au)碰撞中产生的带电强子的横向动量分布。在氘核方向上，在(0.2 < \eta < 1.4)的赝快度范围内，获得了横向动量(0.25 < p_T < 6.0) GeV/c的谱。与相同碰撞能量下的(p + \bar{p})碰撞相比，给出了谱随碰撞中心度的演化。随着中心度增加，高横向动量处的产额比整体粒子密度增加得更快，导致谱形状的强烈改变。这种谱形状的变化在性质上不同于相同能量下(Au + Au)碰撞中的观测结果。这些结果为区分在(Au + Au)碰撞中观测到的高(p_T)强子抑制的不同模型提供了重要信息。
