Abstract
LHC searches for supersymmetry currently focus on strongly produced sparticles, which are copiously produced if gluinos and squarks have masses of a few hundred GeV. However, in supersymmetric models with heavy scalars, as favored by the decoupling solution to the SUSY flavor and CP problems, and \( {m_{{\widetilde{g}}}} \gtrsim {5}00{\text{ GeV}} \) as indicated by recent LHC results, chargino-neutralino \( \left( {\widetilde{W}_1^{\pm }{{\widetilde{Z}}_2}} \right) \) production is the dominant cross section for \( {m_{{{{\widetilde{W}}_1}}}} \sim {m_{{{{\widetilde{Z}}_2}}}} < {m_{{\widetilde{g}}}}/3 \) at LHC with \( \sqrt {s} = 7\;{\text{TeV}} \) (LHC7). Furthermore, if \( {m_{{{{\widetilde{Z}}_1}}}} + {m_Z} \lesssim {m_{{{{\widetilde{Z}}_2}}}} \lesssim {m_{{{{\widetilde{Z}}_1}}}} + {m_h} \), then \( {\widetilde{Z}_2} \) dominantly decays via \( {\widetilde{Z}_2} \to {\widetilde{Z}_1}Z \), while \( {\widetilde{W}_1} \) decays via \( {\widetilde{W}_1} \to {\widetilde{Z}_1}W \). We investigate the LHC7 reach in the channel (for both leptonic and hadronic decays of the W boson) in models with and without the assumption of gaugino mass universality. In the case of the mSUGRA/CMSSM model with heavy squark masses, the LHC7 discovery reach in the
channel becomes competetive with the reach in the canonical
+ jets channel for integrated luminosities ∼30 fb−1. We also present the LHC7 reach for a simplified model with arbitrary \( {m_{{{{\widetilde{Z}}_1}}}} \) and \( {m_{{{{\widetilde{W}}_1}}}} \sim {m_{{\widetilde{Z}2}}} \). Here, we find a reach of up to \( {m_{{{{\widetilde{W}}_1}}}} \) ∼ 200 (250) GeV for 10 (30) fb−1.
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Baer, H., Barger, V., Kraml, S. et al. WZ plus missing-E T signal from gaugino pair production at LHC7. J. High Energ. Phys. 2012, 92 (2012). https://doi.org/10.1007/JHEP03(2012)092
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DOI: https://doi.org/10.1007/JHEP03(2012)092