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Yasuda T, Yatsunenko Y A, Yip K, Yoo H D, Youn S W, Yu J, Zatserklyaniy A, Zeitnitz C, Zhao T, Zhou B, Zhu J, Zielinski M, Zieminska D, Zieminski A, Zivkovic L, Zutshi V, Zverev E G
Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2008 Mar 14;100(10):102002. doi: 10.1103/PhysRevLett.100.102002. Epub 2008 Mar 11.
We present a measurement of the shape of the Z/gamma* boson transverse momentum (q(T)) distribution in pp --> Z/gamma* --> e(+)e(-) + X events at a center-of-mass energy of 1.96 TeV using 0.98 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron collider. The data are found to be consistent with the resummation prediction at low q(T), but above the perturbative QCD calculation in the region of q(T)>30 GeV/c. Using events with q(T)<30 GeV/c, we extract the value of g(2), one of the nonperturbative parameters for the resummation calculation. Data at large boson rapidity y are compared with the prediction of resummation and with alternative models that employ a resummed form factor with modifications in the small Bjorken x region of the proton wave function.
我们利用费米实验室万亿电子伏特加速器上D0探测器收集的0.98飞靶⁻¹数据，给出了质心能量为1.96 TeV的质子-质子对撞（pp→Z/γ*→e⁺e⁻+X事件）中Z/γ*玻色子横向动量（q(T)）分布形状的测量结果。发现数据在低q(T)时与重整化预测一致，但在q(T)>30 GeV/c区域高于微扰量子色动力学计算结果。利用q(T)<30 GeV/c的事件，我们提取了g(2)的值，它是重整化计算的非微扰参数之一。将大玻色子快度y处的数据与重整化预测以及在质子波函数的小比约肯x区域采用修正的重整化形状因子的替代模型进行了比较。
