Eur. Phys. J. C (2017) 77: 499
https://doi.org/10.1140/epjc/s10052-017-5067-3

Regular Article - Theoretical Physics

Gluino reach and mass extraction at the LHC in radiatively-driven natural SUSY

¹ Department of Physics and Astronomy, University of Oklahoma, Norman, OK, 73019, USA
² Department of Physics, University of Wisconsin, Madison, WI, 53706, USA
³ Department of Physics and Astronomy, University of Hawaii, Honolulu, HI, 96822, USA
⁴ Enrico Fermi Institute, University of Chicago, Chicago, IL, 60637, USA
⁵ HEP Division, Argonne National Laboratory, 9700 Cass Ave., Argonne, IL, 60439, USA
⁶ Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX, 77843, USA

^* e-mail: jgainer@hawaii.edu

Received: 12 April 2017
Accepted: 14 July 2017
Published online: 27 July 2017

Abstract

Radiatively-driven natural SUSY (RNS) models enjoy electroweak naturalness at the 10% level while respecting LHC sparticle and Higgs mass constraints. Gluino and top-squark masses can range up to several TeV (with other squarks even heavier) but a set of light Higgsinos are required with mass not too far above  GeV. Within the RNS framework, gluinos dominantly decay via or , where the decay products of the higgsino-like and are very soft. Gluino pair production is, therefore, signaled by events with up to four hard b-jets and large . We devise a set of cuts to isolate a relatively pure gluino sample at the (high-luminosity) LHC and show that in the RNS model with very heavy squarks, the gluino signal will be accessible for  GeV for an integrated luminosity of 300 (3000) fb. We also show that the measurement of the rate of gluino events in the clean sample mentioned above allows for a determination of with a statistical precision of 2–5% (depending on the integrated luminosity and the gluino mass) over the range of gluino masses where a 5 discovery is possible at the LHC.