# Closing in on compressed gluino-neutralino spectra at the LHC

Abstract : A huge swath of parameter space in the context of the Minimal Supersymmetric Standard Model (MSSM) has been ruled at after run I of the LHC. Various exclusion contours in the $m_{\tilde{g}}-\m_{\tilde{\chi}_{1}^{0}}$ plane were derived by the experimental collaborations, all based on three-body gluino decay topologies. These limits are however extremely model dependent and do not always reflect the level of exclusion. If the gluino-neutralino spectrum is compressed, then the current mass limits can be drastically reduced. In such situations, the radiative decay of the gluino $\gino \ra g \neut{1}$ can be dominant and used as a sensitive probe of small mass splittings. We examine the sensitivity of constraints of some Run I experimental searches on this decay after recasting them within the \texttt{MadAnalysis5} framework. The recasted searches are now part of the \texttt{MadAnalysis5} Public Analysis Database. We also design a dedicated search strategy and investigate its prospects to uncover this decay mode of the gluino at run II of the LHC. We emphasize that a multijet search strategy may be more sensitive than a monojet one, even in the case of very small mass differences.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-01187915
Contributor : Emmanuelle Vernay <>
Submitted on : Friday, August 28, 2015 - 9:19:18 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:05 PM

### Citation

G. Chalons, D. Sengupta. Closing in on compressed gluino-neutralino spectra at the LHC. Journal of High Energy Physics, Springer Verlag (Germany), 2015, 2015 (12), pp.129. ⟨10.1007/JHEP12(2015)129⟩. ⟨in2p3-01187915⟩

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