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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2004 Feb 6;92(5):051802. doi: 10.1103/PhysRevLett.92.051802. Epub 2004 Feb 5.
J/psi production has been measured in proton-proton collisions at square root of s=200 GeV over a wide rapidity and transverse momentum range by the PHENIX experiment at the Relativistic Heavy Ion Collider. Distributions of the rapidity and transverse momentum, along with measurements of the mean transverse momentum and total production cross section are presented and compared to available theoretical calculations. The total J/psi cross section is 4.0+/-0.6(stat)+/-0.6(syst)+/-0.4(abs) mu b. The mean transverse momentum is 1.80+/-0.23(stat)+/-0.16(syst) GeV/c.
相对论重离子对撞机上的PHENIX实验在质心能量平方根(\sqrt{s}=200)GeV的质子-质子碰撞中,在很宽的快度和横向动量范围内测量了J/ψ粒子的产生。给出了快度和横向动量分布,以及平均横向动量和总产生截面的测量结果,并与现有的理论计算进行了比较。J/ψ粒子的总截面为(4.0\pm0.6)(统计)(\pm0.6)(系统)(\pm0.4)(绝对)微靶。平均横向动量为(1.80\pm0.23)(统计)(\pm0.16)(系统)GeV/c。