2016/11/09 by Baer, Howard, Berggren, Mikael, Fujii, Keisuke +4
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1611.02846
A core prediction of natural Supersymmetry is the existence of four light higgsinos not too far above the mass of the Z boson. The small mass splittings amongst the higgsinos -- typically 5-20 GeV -- imply very little visible energy release from decays of heavier higgsinos. In particular, if other SUSY particles are quite heavy, as can be the case in SUSY with radiatively-driven naturalness, the higgsinos are extremely hard to detect at hadron colliders. The clean environment of electron-positron colliders with √(s) > 2mhiggsino, however, would allow for a decisive search for the required light higgsinos. Thus, e+e- colliders should either discover or exclude natural SUSY. We present a detailed study of higgsino pair production at the proposed International Linear e+e- Collider which is under consideration for construction in Japan. A variety of precision measurements should allow for extraction of underlying parameters and provide a window onto physics at the grand unified scale.