Search for R-parity violating decays of scalar fermions at LEP
Search for R-parity violating decays of scalar fermions at LEP
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在 LEP 中搜索标量费米子的 R 宇称破坏衰变
DOI：
10.1007/s100529900226
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
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作者：
T. O. C. G. Abbiendi;et al.
利用LEP的蛋白石探测器收集的积分光度为56pbat的质量中心能量为183GeV的数据样本，进行了对产生的标量费米子的耦合违反R宇称的搜索。FR-宇称破缺相互作用的一个重要结果是，最轻的超对称粒子预计是不稳定的。在假设最轻的超对称粒子迅速衰变，并且对于所考虑的每种衰变模式，只有一个热宇称破坏耦合占主导地位的假设下，对带电的尾子、中微子和停止夸克的反宇称衰变衰变进行了研究。这样的过程将在最终状态下产生多轻子、喷流加轻子或多喷流，无论有没有缺失的能量。没有观察到明显过度的此类事件。给出了在R宇称破坏情形下标量费米子产生截面的极限。在约束最小超对称标准模型的框架下，还给出了质量排斥区域。
A search for pair produced scalar fermions with couplings that violateR-parity has been performed using a data sample corresponding to an integrated luminosity of 56 pbat a centre-of-mass energy of183 GeV collected with the OPAL detector at LEP. An important consequence ofR-parity breaking interactions is that the lightest supersymmetric particle is expected to be unstable. Searches forR-parity violating decays of charged sleptons, sneutrinos and stop quarks have been performed under the assumptions that the lightest supersymmetric particle decays promptly and that only one of theR-parity violating couplings is dominant for each of the decay modes considered. Such processes would yield multi-leptons, jets plus leptons or multi-jets, with or without missing energy, in the final state. No significant excess of such events has been observed. Limits on the production cross-sections of scalar fermions inR-parity violating scenarios are obtained. Mass exclusion regions are also presented in the framework of the Constrained Minimal Supersymmetric Standard Model.