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University of Florida, Gainesville, Florida 32611, USA.
Phys Rev Lett. 2005 May 6;94(17):171802. doi: 10.1103/PhysRevLett.94.171802. Epub 2005 May 5.
We report the first largely model independent measurement of charged particle multiplicities in quark and gluon jets, Nq and Ng, produced at the Fermilab Tevatron in pp collisions with a center-of-mass energy of 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies of 41 and 53 GeV by counting charged particle tracks in cones with opening angles of theta(c) = 0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q = Ejet theta c varies in the range from 12 to 25 GeV. At Q = 19.2 GeV, the ratio of multiplicities r = Ng/Nq is found to be 1.64+/-0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with resummed perturbative QCD calculations.
我们报告了首次在很大程度上独立于模型的对夸克喷注和胶子喷注中带电粒子多重性Nq和Ng的测量，这些喷注是在费米实验室万亿电子伏特加速器的质子-质子碰撞中产生的，质心能量为1.8 TeV，并由费米实验室的对撞机探测器记录。通过对围绕喷注轴的开口角为θ(c)=0.28、0.36和0.47弧度的圆锥内的带电粒子轨迹进行计数，对平均能量为41和53 GeV的喷注进行测量。相应的喷注硬度Q = Ejetθc在12到25 GeV范围内变化。在Q = 19.2 GeV时，发现多重性比r = Ng/Nq为1.64±0.17，其中统计和系统不确定性是平方和相加的。结果与重整化微扰量子色动力学计算结果一致。
