Journal Article/Contribution to a conference proceedings/Contribution to a book

PUBDB-2021-00883

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The ILC as a natural SUSY discovery machine and precision microscope: From light higgsinos to tests of unification

Sasikumar, K. S. (Corresponding author)Extern*DESY* ; List, J.DESY* ; Berggren, C. M.DESY* ; Lehtinen, S.-L. ; Fuji, K. ; Yan, J. ; Tanabe, T. ; Baer, H.

2020
SISSA Trieste

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Please use a persistent id in citations: doi:10.22323/1.364.0596  doi:10.3204/PUBDB-2021-00883

Abstract: The requirement of electroweak naturalness in simple supersymmetric models motivates the existence of a cluster of four light higgsinos with mass $100 - 300$ GeV, the lighter the better. While such light compressed spectra may be challenging to observe at the LHC, future $e^+e^-$ colliders with $\sqrt{s} > 2$m(higgsino) would serve as both a SUSY discovery machine and a precision microscope. We study signatures of higgsino pair production at the ILC based on full, Geant4-based simulation of the ILD detector concept. We examine several benchmark scenarios that may or may not be accessible to HL-LHC searches, with mass differences between the higgsino states between 4 and 20 GeV. Assuming $\sqrt{s}\geq$ 500 GeV and $1000$ fb$^{-1}$ of integrated luminosity, the individual higgsino masses can be measured to $1 - 2\%$ precision in case of the larger mass differences, and at the level of 5$\%$ for the smallest mass difference case. The higgsino mass splittings are sensitive to the electroweak gaugino masses and can allow extraction of gaugino masses to $3 - 20\%$ (depending on the model).Extrapolation of gaugino masses via renormalization group running can test the hypothesis of gaugino mass unification. We also examine a case with natural generalized mirage mediation where the unification of gaugino masses at an intermediate scale apparently gives rise to a natural SUSY spectrum somewhat beyond the reach of the HL-LHC.

Keyword(s): new physics ; naturalness ; supersymmetry: parameter space ; supersymmetry: symmetry breaking ; mediation: mirage ; ILC Coll ; ILD detector ; electron positron: scattering ; electron positron: linear collider ; gaugino: mass ; gaugino: production ; Higgsino: mass ; Higgsino: production

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Contributing Institute(s):

1. Experimente an Lepton Collidern (FLC)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. Facility (machine) ILC

Appears in the scientific report 2020

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Database coverage:
; ; ; ; DOAJ Seal ; SCOPUS

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