photini阴影中的超对称性
Supersymmetry in the shadow of photini
摘要：
额外的中性规范费米子--“光子”--作为U（1）规范场的超伴子出现在弦紧化中。与它们的矢量对应物不同，光子可以从软超对称破缺中获得弱尺度的质量，并通过与双星的质量混合在LHC上产生可观测的特征。在这项工作中，我们调查的对撞机的后果，增加光的中性伴子部门的MSSM。一个或多个光子与双光子的相对较大的混合可以导致最轻的普通超对称粒子的快速衰变;这些额外的级联将超对称衰变链的大部分能量转移到标准模型粒子中，减少了丢失能量的能力，作为信号识别的实验手柄。我们表明，丢失的能量在超对称事件与photini显着减少与MSSM中性伴子的超对称谱附近的弱标度，并研究了在ATLAS和CMS领先的强子超对称搜索设置的限制的影响。我们发现，即使是一个光photino的存在下，夸克质量的限制强子搜索可以减少400 GeV，具有可比性（虽然更温和）减少的胶子质量限制。我们还考虑了潜在的发现渠道，如双轻子和多轻子搜索，这仍然是敏感的超对称谱与光子，并可以提供一个意想不到的路线发现超对称性。虽然在光的背景下，我们的研究结果适用于一般的理论，其中额外的轻中性费米子混合MSSM gauginos。
英文摘要：
Additional neutral gauge fermions -- "photini" -- arise in string compactifications as superpartners of U(1) gauge fields. Unlike their vector counterparts, the photini can acquire weak-scale masses from soft SUSY breaking and lead to observable signatures at the LHC through mass mixing with the bino. In this work we investigate the collider consequences of adding photini to the neutralino sector of the MSSM. Relatively large mixing of one or more photini with the bino can lead to prompt decays of the lightest ordinary supersymmetric particle; these extra cascades transfer most of the energy of SUSY decay chains into Standard Model particles, diminishing the power of missing energy as an experimental handle for signal discrimination. We demonstrate that the missing energy in SUSY events with photini is reduced dramatically for supersymmetric spectra with MSSM neutralinos near the weak scale, and study the effects on limits set by the leading hadronic SUSY searches at ATLAS and CMS. We find that in the presence of even one light photino the limits on squark masses from hadronic searches can be reduced by 400 GeV, with comparable (though more modest) reduction of gluino mass limits. We also consider potential discovery channels such as dilepton and multilepton searches, which remain sensitive to SUSY spectra with photini and can provide an unexpected route to the discovery of supersymmetry. Although presented in the context of photini, our results apply in general to theories in which additional light neutral fermions mix with MSSM gauginos.
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