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This document discusses a proposal to estimate the invisible Z background at the 2013 Moriond conference. For the T2bW channel, the proposal is to use the 2011 method of combining Z->dilepton with gamma+jets, updating it for 2012 selections. For the more challenging T2tt channel, ideas are discussed to use independent control samples and relax top tagging cuts to estimate the ratio between loose and nominal top tagging. A team is in place to carry out the necessary tasks, including measuring b-tag fractions

Author

Alexis Kalogeropoulos

Language

EN