用事件树约束浅色粒子
Constraining Light Colored Particles with Event Shapes
摘要：
使用最近开发的软共线有效理论计算事件形状的技术，LEP事件形状数据被用来导出新的有色粒子的强模型独立的边界。在有效场论计算中，有色粒子不仅对α_s的运行有贡献，而且对硬函数、喷流函数和软函数的运行也有贡献。此外，有效理论中的微分分布明确地探测了许多能量标度，因此事件形状对新粒子阈值具有很强的敏感性。利用ALEPH和OPAL的推力数据，在95%的置信水平下排除了51.0 GeV以下的有色伴随费米子（如胶子）。这几乎是一个数量级的改善，比以前的模型无关的约束6.3 GeV。
英文摘要：
Using recently developed techniques for computing event shapes with Soft-Collinear Effective Theory, LEP event shape data is used to derive strong model-independent bounds on new colored particles. In the effective field theory computation, colored particles contribute in loops not only to the running of alpha_s but also to the running of hard, jet and soft functions. Moreover, the differential distribution in the effective theory explicitly probes many energy scales, so event shapes have strong sensitivity to new particle thresholds. Using thrust data from ALEPH and OPAL, colored adjoint fermions (such as a gluino) below 51.0 GeV are ruled out to 95% confidence level. This is nearly an order-of-magnitude improvement over the previous model-independent bound of 6.3 GeV.
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