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• W3100809483 abstract "Naturalness arguments applied to supersymmetric theories imply a spectrum containing four light higgsinos tz_{1,2} and tw_1^+- with masses ~ 100-300 GeV (the closer to M_Z the more natural). The compressed mass spectrum and associated low energy release from tw_1 and tz_2 three-body decay makes higgsinos difficult to detect at LHC14, while the other sparticles might be heavy, and possibly even beyond LHC14 reach. In contrast, the International Linear e^+e^- Collider (ILC) with sqrt{s}>2m(higgsino) would be a {it higgsino factory} in addition to a Higgs boson factory and would serve as a discovery machine for natural SUSY! In this case, both chargino and neutralino production %which give rise to distinct event topologies, occur at comparable rates, and lead to observable signals above SM backgrounds. We examine two benchmark cases, one just beyond the LHC8 reach with tw_1(tz_2)-tz_1 mass gap of 15 (21) GeV, and a second more difficult case beyond even the LHC14 reach, where the mass gap is just 10 GeV, close to its minimum in models with no worse than 3% fine-tuning. The signal is characterized by low visible energy events together with MET in the one or two jets +1ell channel from chargino production, and in the opposite sign, same-flavour, acoplanar dilepton channel from tz_1tz_2 production. For both cases, we find that the signal is observable above backgrounds from the usual 2-> 2 SM events and from gammagamma collisions with just a few fb^{-1} of integrated luminosity. We also show that with an integrated luminosity of 100~fb^{-1}, it should be possible to extract tw_1, tz_2 and tz_1 masses to percent level. These measurements would point to higgsinos as the origin of new physics and strongly suggest a link to a natural origin for W, Z and h masses." @default.
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• W3100809483 date "2014-06-01" @default.
• W3100809483 modified "2023-10-14" @default.
• W3100809483 title "Physics at a Higgsino factory" @default.
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• W3100809483 doi "https://doi.org/10.1007/jhep06(2014)172" @default.
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