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University of Florida, Gainesville 32611, USA.
Phys Rev Lett. 2004 Aug 6;93(6):061802. doi: 10.1103/PhysRevLett.93.061802.
We report on a search for anomalous production of events with at least two charged, isolated, like-sign leptons, each with pT > 11 GeV/c using a 107 pb(-1) sample of 1.8 TeV pp collisions collected by the CDF detector. We define a signal region containing low background from standard model processes. To avoid bias, we fix the final cuts before examining the event yield in the signal region using control regions to test the Monte Carlo predictions. We observe no events in the signal region, consistent with an expectation of 0.63(+0.84)(-0.07) events. We present 95% confidence level limits on new physics processes in both a signature-based context as well as within a representative minimal supergravity (tanbeta = 3) model.
我们报告了一项搜索，使用CDF探测器收集的1.8 TeV质子-质子碰撞的107 pb⁻¹样本，寻找至少有两个带电、孤立、同号轻子且每个轻子的横向动量pT > 11 GeV/c的异常事件产生情况。我们定义了一个信号区域，该区域来自标准模型过程的背景较低。为避免偏差，我们在使用控制区域检验蒙特卡罗预测以检查信号区域的事件产率之前，确定了最终的切割条件。我们在信号区域未观察到任何事件，这与预期的0.63(+0.84)(-0.07)个事件相符。我们给出了基于特征的情况下以及在一个代表性的最小超引力（tanβ = 3）模型内新物理过程的95%置信水平限制。
