Constricted SUSY from No-Scale ℱ-SU(5): A “blind spot” for LHC top quark reconstruction?
1 State Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences - Beijing 100190, PRC
2 George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University College Station, TX 77843, USA
3 Department of Physics and Astronomy, Ball State University - Muncie, IN 47306 USA
4 Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus Woodlands, TX 77381, USA
5 Academy of Athens, Division of Natural Sciences - 28 Panepistimiou Avenue, Athens 10679, Greece
6 Department of Physics, Sam Houston State University - Huntsville, TX 77341, USA
Received: 20 July 2013
Accepted: 29 October 2013
We describe a region of the No-Scale supersymmetric model with TeV-scale vector-like matter multiplets that is potentially opaque to LHC observations based upon top quark reconstruction. Possessing a 100% on-shell branching fraction for gluino-to-light stop decays, the gluino-light stop mass splitting in lies very close to the top quark rest mass in the region . For unboosted gluino pair production, this could render two soft top quarks in the dominant 4-top signature, greatly reducing the likelihood for discrimination from the combinatoric background. We therefore suggest that caution is warranted when gluino exclusion bounds on models possessing a similar spectral character (gluino heavier than the light stop but lighter than all other squarks) using multijet SUSY search tactics. Alternate search methods are highlighted, including those based upon same-sign dileptons and multiple heavy flavor tags, which are more sensitive to this delicate kinematic “blind spot” crease.
PACS: 11.10.Kk – Field theories in dimensions other than four / 11.25.Mj – Compactification and four-dimensional models / 11.25.-w – Strings and branes
© EPLA, 2013