1201.5382 (Howard Baer et al.)

WZ plus missing-E_T signal from gaugino pair production at LHC7    [PDF]

Howard Baer, Vernon Barger, Sabine Kraml, Andre Lessa, Warintorn Sreethawong, Xerxes Tata

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_{\tg}> 500 GeV as indicated by recent LHC results, chargino--neutralino
(\tw_1^\pm\tz_2) production is the dominant cross section for m_{\tw_1} \sim
m_{\tz_2} < m_{\tg}/3 at LHC with \sqrt{s}=7 TeV (LHC7). Furthermore, if
m_{\tz_1}+m_Z \lesssim m_{\tz_2}\lesssim m_{\tz_1}+m_h, then \tz_2 dominantly
decays via \tz_2\to\tz_1 Z, while \tw_1 decays via \tw_1\to \tz_1 W. We
investigate the LHC7 reach in the WZ + MET 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 WZ+MET channel becomes
competetive with the reach in the canonical MET + jets channel for integrated
luminosities \sim 30 fb^-1. We also present the LHC7 reach for a simplified
model with arbitrary m_{\tz_1} and m_{\tw_1} \sim m_{\tz_2}. Here, we find a
reach of up to m_{\tw_1}\sim 200 (250) GeV for 10 (30) fb^-1.

View original: http://arxiv.org/abs/1201.5382