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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2007 Mar 16;98(11):112001. doi: 10.1103/PhysRevLett.98.112001. Epub 2007 Mar 14.
We present the first observation of exclusive e(+)e(-) production in hadron-hadron collisions, using pp[over] collision data at (square root) s = 1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb(-1). We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy E(T) > 5 GeV and pseudorapidity |eta| < 2. With these criteria, 16 events are observed compared to a background expectation of 1.9+/-0.3 events. These events are consistent in cross section and properties with the QED process pp[over] --> p + e(+)e(-) + p[over] through two-photon exchange. The measured cross section is 1.6(-0.3)(+0.5)(stat) +/- 0.3(syst) pb. This agrees with the theoretical prediction of 1.71+/-0.01 pb.
我们利用费米实验室运行II期对撞机探测器采集的质心能量√s = 1.96 TeV的质子-反质子（pp̅）碰撞数据，给出了强子-强子碰撞中e⁺e⁻ 对产生的首次观测结果，对应积分亮度为532 pb⁻¹。我们要求探测器中除了一个电子和一个正电子候选事例外，不存在任何其他粒子信号，每个事例的横向能量E_T > 5 GeV且赝快度|η| < 2。基于这些标准，观测到16个事例，而背景预期为1.9 ± 0.3个事例。这些事例在截面和性质上与通过双光子交换的QED过程pp̅ → p + e⁺e⁻ + p̅ 一致。测量得到的截面为1.6(-0.3)(+0.5)(统计) ± 0.3(系统) pb。这与理论预测的1.71 ± 0.01 pb相符。
