Likelihood analysis of supersymmetric SU(5) GUTs

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• 作者：E. Bagnaschi ; J. C. Costa ; K. Sakurai ; M. Borsato…
• 刊名：The European Physical Journal C
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：77
• 期：2
• 全文大小：5189KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Elementary Particles, Quantum Field Theory; Nuclear Physics, Heavy Ions, Hadrons; Quantum Field Theories, String Theory; Measurement Science and Instrumentation; Astronomy, Astrophysics and Cosmology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1434-6052
• 卷排序：77

文摘

We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass \(m_{1/2}\), distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), \(m_5\) and \(m_{10}\), and for the \(\mathbf {5}\) and \({\bar{\mathbf{5}}}\) Higgs representations \(m_{H_u}\) and \(m_{H_d}\), a universal trilinear soft SUSY-breaking parameter \(A_0\), and the ratio of Higgs vevs \(\tan \beta \). In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel \({\tilde{u}_R}/{\tilde{c}_R} - \tilde{\chi }^{0}_{1}\) coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of \({{\tilde{\nu }}_\tau }\) coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.