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arXiv 0907.2713hep-ph
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超对称性竞赛:使用mT2进行发现

The race for supersymmetry: using mT2 for discovery

Alan J. Barr, Claire Gwenlan

摘要:

我们描述了如何可以采用一个非常简单的事件选择,只使用运动变量mT2,寻找新的粒子在大型强子对撞机。该方法在寻找具有Z2宇称和弱相互作用的最轻宇称奇粒子的模型(如R宇称守恒超对称)的证据时很有用。我们讨论的运动学特性,使这个变量对绝大多数的标准模型背景的一个很好的判别。蒙特卡罗模拟表明,这种方法可以用来发现超对称性,其积分亮度(或可能更低的质心能量)比其他类似分析所需的要小。

英文摘要:

We describe how one may employ a very simple event selection, using only the kinematic variable mT2, to search for new particles at the LHC. The method is useful when searching for evidence of models (such as R-parity conserving supersymmetry) which have a Z2 parity and a weakly-interacting lightest parity-odd particle. We discuss the kinematic properties which make this variable an excellent discriminant against the great majority of Standard Model backgrounds. Monte Carlo simulations suggest that this approach could be used to discover supersymmetry with somewhat smaller integrated luminosities (or perhaps lower center-of-mass energies) than would be required for other comparable analyses.

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