Abstract
Searches for weakly interacting particles is one of the main goals of the high luminosity LHC run. In this work we study the well motivated cases of electroweakinos with mostly Wino and Bino components. We show the relevance of squark induced t-channel production in defining the production cross section and hence the LHC reach. Moreover, a realistic evaluation of the decay branching ratios show a strong dependence on the sign of μ and, for negative values of μ, on the relative size of the ratio of μ to the gaugino masses compared with tan β. Overall, unless it is kinematically suppressed, or specific conditions are fulfilled, the Higgs decay channel is the most significant one, and the trilepton channel becomes subdominant with respect to final states including bottom quarks. Although the properties are different than in the Higgsino-Bino case, also in this case the discovery reach extends to mass values that are significantly larger than the ones probed at current luminosities, leading to a strong motivation for the search for electroweakinos in the high luminosity LHC run.
Highlights
Extension of the SM (MSSM) [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
A realistic evaluation of the decay branching ratios show a strong dependence on the sign of μ and, for negative values of μ, on the relative size of the ratio of μ to the gaugino masses compared with tan β
We demonstrated the complementarity of the production of electroweakinos via the heavy Higgs bosons with the ones induced by the direct production of these particles via gauge bosons and, due to the smaller production cross sections, we showed that the regions probed at present are far weaker than the ones that are usually displayed experimentally for the Wino case
Summary
The current reach of electroweakinos at the LHC has been presented in numerous studies by the ATLAS and CMS collaborations refs. [10,11,12,13,14, 16, 17, 19]. The trilpeton searches again lose sensitivity everywhere beyond the compressed region, and except when μ < 0 and tan β = 50 due to the suppression of the branching ratio of χ02 to Z In this case the overall reach improves due to the increase in the production cross section. The decoupling of scalars gives an increase in the production cross section yeilding a slightly larger reach in both the Higgs and trilepton channels, and for negative μ the trilepton searches remain sensitive to the blind spot resulting in an even larger reach compared to the case of a universal SUSY scale (bottom right panel of figure 5)
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