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arXiv 1101.2185hep-ex
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在LHC上用TeV探测器测定sqrt(s)=7时pp碰撞的亮度

Luminosity Determination in pp Collisions at sqrt(s)=7 TeV Using the ATLAS Detector at the LHC

The ATLAS Collaboration

摘要:

本文介绍了在大型强子对撞机(LHC)运行初期,用ATLAS探测器在sqrt(s)= 7 TeV下获得的光度测量结果。使用几个探测器和多种算法独立地确定光度,每个算法具有不同的接受度、系统不确定性和对背景的灵敏度。从这些方法获得的光度的比率作为时间和μ的函数进行监测,非弹性相互作用每束交叉的平均数。对于0<mu<2.5,方法之间的剩余时间和mu依赖性小于2%。绝对光度校准,使用束分离扫描进行,有一个共同的系统不确定性+/-11,主要是由大型强子对撞机束流的测量。校准后,从不同方法获得的光度相差最多+/-2%。使用光束扫描测量的可见截面与PYTHIA和PHOJET事件发生器和ATLAS探测器模拟获得的预测进行比较。

英文摘要:

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the luminosities obtained from these methods are monitored as a function of time and of mu, the average number of inelastic interactions per bunch crossing. Residual time- and mu-dependence between the methods is less than 2% for 0<mu<2.5. Absolute luminosity calibrations, performed using beam separation scans, have a common systematic uncertainty of +/-11, dominated by the measurement of the LHC beam currents. After calibration, the luminosities obtained from the different methods differ by at most +/-2%. The visible cross sections measured using the beam scans are compared to predictions obtained with the PYTHIA and PHOJET event generators and the ATLAS detector simulation.

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