SoftDiscplacedTracks
Search for nearly mass-degenerate higgsinos using low-momentum mildly-displaced tracks in pp collisions at \srtq = 13 TeV with the ATLAS detector
https://arxiv.org/abs/2401.14046
- In the MSSM, the higgsino and wino and bino fields, whose masses are characterized by the parameters mu, M1, and M2, undergo kinetic mixing as the result of the electroweak symmetry breaking, yielding charged and neutral mass eigenstates. In the case mu << M1 and M2, the lightest charged and two neutral higgsino-like eigenstates form a nearly mass-degenerate triplet of higgsino-like mass eigenstates (X1^+/-, X20 , X10)collectively referred to as higgsinos in this Letter. In the pure higgsino limit where the bino and wino are decoupled in mass radiative corrections induce a small mass-splitting (250-400 MeV) between the higginos that gives teh X1^+/- a long enought lifefitme to produce the disappearing track signature in the detector, as exploited by existing searches.