Measurement of the cross-section for Z → e+e- production in pp collisions at √s=7 TeV
Measurement of the cross-section for Z → e+e- production in pp collisions at √s=7 TeV
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DOI：
10.1007/jhep02(2013)106
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发表时间：
2013-02-01
影响因子：
5.4
通讯作者：
Zvyagin, A.
中科院分区：
文献类型：
--
作者：
Aaij, R.;Abellan Beteta, C.;Zvyagin, A.
利用对应于0.94 fb（-1）的积分光度的根s = 7 TeV处的数据给出了pp -> Z -> e（+）e（-）的截面测量。对于子电子和双电子不变质量在60-120 GeV/c（2）范围内的子电子，在运动学接受范围p（T）> 20 GeV/c和2 < eta < 4.5内测量该过程。横截面被确定为besigma（pp -> Z -> e（+）e（-））= 76.0 +/- 0.8 +/- 2.0 +/- 2.6 pb其中第一个不确定性是统计的，第二个是系统的，第三个是光度的不确定性。测量是作为Z快度的函数和作为与Z横向动量密切相关的角变量的函数进行的。结果与以前的LHCb测量和QCD的理论预测进行了比较。
A measurement of the cross-section for pp -> Z -> e(+)e(-) is presented using data at root s = 7 TeV corresponding to an integrated luminosity of 0.94 fb(-1). The process is measured within the kinematic acceptance p(T) > 20 GeV/c and 2 < eta < 4.5 for the daughter electrons and dielectron invariant mass in the range 60-120 GeV/c(2). The cross-section is determined to besigma(pp -> Z -> e(+)e(-)) = 76.0 +/- 0.8 +/- 2.0 +/- 2.6 pbwhere the first uncertainty is statistical, the second is systematic and the third is the uncertainty in the luminosity. The measurement is performed as a function of Z rapidity and as a function of an angular variable which is closely related to the Z transverse momentum. The results are compared with previous LHCb measurements and with theoretical predictions from QCD.