Orateur
Dr
Thomas Rizzo
(SLAC)
Description
We demonstrate that the 3σ excess observed by ATLAS in the Z+MET channel at 8 TeV
can be explained within the context of the MSSM. Using the freedom inherent in the
pMSSM, we perform a detailed analysis of the parameter space and find a scenario that
describes the excess while simultaneously complying with all other search constraints
from the Run I data at 7 and 8 TeV, including the Z+MET analysis by CMS. We
generate a small sample of simplified models, using promising models from our existing
pMSSM sample as seeds, and study their properties. The successful region is described
by the production of 1st/2nd generation squark pairs, followed by their decay into a
bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting
a Z boson, i.e., ˜q → B˜ → h˜ with ˜q = Q˜L, u˜R, or ˜dR. The sweet spot for the sparticle
spectrum is found to have squark masses in the 500-750 GeV range, with bino masses
near 350 GeV with a mass splitting of 150-200 GeV with the Higgsino LSP. If this
excess holds, then this scenario predicts that a signal will be observed in the 0l+jets
and/or 1l+jets searches in the early operations of Run II. Further implications of this scenario will be discussed.
Auteur principal
Dr
Thomas Rizzo
(SLAC)
