  We present a search for Physics beyond the Standard Model (SM) in final
states with a Z boson, jets and missing transverse energy, using a data sample
collected in 2011 by the CMS detector at the Large Hadron Collider
corresponding to an integrated luminosity of 2.1 /fb. This final state is
predicted in several models of Physics beyond the SM, including supersymmetry.
A novel analysis method is exploited, the Jet-Z Balance method, and a precise
determination of the total SM background is obtained using a control sample
from data. In the absence of any significant excess beyond the SM background,
upper limits are set on simple models of supersymmetry, and further information
is provided to allow confrontation of other models to these results.
