An Haipeng, Wang Lian-Tao
Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Enrico Fermi Institute and Department of Physics, University of Chicago, 5620 South Ellis Avenue, Chicago, Illinois 60637, USA.
Phys Rev Lett. 2015 Oct 30;115(18):181602. doi: 10.1103/PhysRevLett.115.181602. Epub 2015 Oct 29.
Light top superpartners play a key role in stabilizing the electroweak scale in supersymmetric theories. For R-parity conserved supersymmetric models, traditional searches are not sensitive to the compressed regions. In this Letter, we propose a new method targeting this region, with top squark and neutralino mass splitting ranging from m_{t[over ˜]}-m_{χ}≳m_{t} to about 20 GeV. In particular, we focus on the signal process in which a pair of top squarks are produced in association with a hard jet, and we define a new observable R_{M} whose distribution has a peak in this compressed region. The position of the peak is closely correlated with m_{t[over ˜]}. We show that for the 13 TeV LHC with a luminosity of 3000 fb^{-1}, this analysis can extend the reach of the top squark in the compressed region to m_{t[over ˜]} around 800 GeV.
在超对称理论中，轻型顶超伴子在稳定电弱标度方面起着关键作用。对于R宇称守恒的超对称模型，传统搜索对压缩区域不敏感。在本信函中，我们提出了一种针对该区域的新方法，其中顶夸克超伴子和中性子的质量分裂范围为(m_{\tilde{t}} - m_{\chi} \gtrsim m_t)至约20 GeV。特别地，我们专注于一对顶夸克超伴子与一个硬喷注关联产生的信号过程，并定义了一个新的可观测量(R_M)，其分布在这个压缩区域有一个峰值。峰值位置与(m_{\tilde{t}})密切相关。我们表明，对于亮度为3000 fb⁻¹的13 TeV大型强子对撞机，该分析可将压缩区域中顶夸克超伴子的探测范围扩展到约800 GeV的(m_{\tilde{t}})。
