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arXiv · 1612.00795

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

Howard Baer·Vernon Barger·James S. Gainer·Peisi Huang·Michael Savoy·Dibyashree Sengupta·Xerxes Tata
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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 $m_h\sim 125$ GeV. Within the RNS framework, gluinos dominantly decay via ${\tilde g} \to t{\tilde t}_1^{*},\ \bar{t}{\tilde t}_1 \to t\bar{t}{\widetilde Z}_{1,2}$ or $t\bar{b}{\widetilde W}_1^-+c.c.$, where the decay products of the higgsino-like ${\widetilde W}_1$ and ${\widetilde Z}_2$ are very soft. Gluino pair production is, therefore, signalled by events with up to four hard $b$-jets and large ${\not\!\!{E_T}}$. 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 $m_{\tilde g} < 2400 \ (2800)$ GeV for an integrated luminosity of 300 (3000) fb$^{-1}$. We also show that the measurement of the rate of gluino events in the clean sample mentioned above allows for a determination of $m_{\tilde g}$ with a statistical precision of $2.5-5\%$ (depending on the integrated luminosity and the gluino mass) over the range of gluino masses where a $5σ$ discovery is possible at the LHC.

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Howard Baer, Vernon Barger, James S. Gainer, Peisi Huang, Michael Savoy, Dibyashree Sengupta, Xerxes Tata. 2016-12-02. Gluino reach and mass extraction at the LHC in radiatively-driven natural SUSY. https://doi.org/10.1140/epjc%2Fs10052-017-5067-3

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