# Physics at the LHC and beyond

29 September 2015 to 2 October 2015
DESY Hamburg
Europe/Berlin timezone

## Hiding Missing Energy in Missing Energy

1 Oct 2015, 15:15
15m
Seminar room 4a (DESY Hamburg)

### Speaker

Dr Jia Liu (MITP, Johannes Gutenberg University Mainz)

### Description

Searches for supersymmetry (SUSY) often rely on a combination of hard physics objects (jets, leptons) along with large missing transverse energy to separate New Physics from Standard Model hard processes. We consider a class of double-invisible'' SUSY scenarios: where squarks, stops and sbottoms have a three-body decay into {\em two} (rather than one) invisible final-state particles. This occurs naturally when the LSP carries an additional conserved quantum number under which other superpartners are not charged. In these topologies, the available energy is diluted into invisible particles, reducing the {\em observed} missing energy and visible energy. This can lead to sizable changes in the sensitivity of existing searches, dramatically changing the qualitative constraints on superpartners. % In particular, our studies would indicate that, for a massless LSP, unflavored squarks have limits reduced from $840 \gev$ to $\sim 520 \gev$, sbottoms from $650 \gev$ to $500 \gev$ and stops from $650 \gev$ to $560 \gev$. In particular, for $m_{\text{LSP}}\gtrsim 160\gev$, we find no robust constraints from the LHC at any squark mass for any generation, while for lighter LSPs we find significant reductions in constraints. If confirmed by a full reanalysis from the collaborations, such scenarios allow for the possibility of significantly more natural SUSY models. While not realized in the MSSM, such phenomenology occurs naturally in models with mixed sneutrinos, Dirac gauginos and NMSSM-like models.

### Primary authors

Dr Daniele Alves (CCPP, New York University) Dr Jia Liu (MITP, Johannes Gutenberg University Mainz) Prof. Neal Weiner (CCPP, New York University)

 Slides