Uncover Compressed Supersymmetry via Boosted Bosons from the Heavier Stop/Sbottom

Abstract

A light stop around the weak scale is a hopeful messenger of natural supersymmetry (SUSY), but it has not shown up at the current stage of LHC. Such a situation raises the question of the fate of natural SUSY. Actually, a relatively light stop can easily be hidden in a compressed spectra such as mild mass degeneracy between stop and neutralino plus top quark. Searching for such a stop at the LHC is a challenge. On the other hand, in terms of the argument of natural SUSY, other members in the stop sector, including a heavier stop ${\tilde{t}}_2$ and lighter sbottom ${\tilde{b}}_1$ (both assumed to be left-handed-like), are also supposed to be relatively light and therefore searching for them would provide an alternative method to probe natural SUSY with a compressed spectrum. In this paper we consider quasi-natural SUSY which tolerates relatively heavy colored partners near the TeV scale, with a moderately large mass gap between the heavier members and the lightest stop. Then $W/Z/h$ as companions of ${\tilde{t}}_2$ and ${\tilde{b}}_1$ decaying into ${\tilde{t}}_1$ generically are well boosted, and they, along with other visible particles from ${\tilde{t}}_1$ decay, are a good probe to study compressed SUSY. We find that the resulting search strategy with boosted bosons can have better sensitivity than those utilizing multi-leptons.

19 pages, 6 figures, to appear in EPJC

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• Constraining slepton and chargino through compressed top squark search
• HL-LHC sensitivity to higgsinos from natural SUSY with gravitino LSP
• Probing stops in the coannihilation region at the HL-LHC: a comparative study of different processes