Constraining new coloured matter from the ratio of 3- to 2-jets cross sections at the LHC

Preprint number: CP3-Origins-2014-10 DNRF90 and DIAS-2014-10
Authors: Diego Becciolini (CP3-Origins & DIAS), Marc Gillioz (CP3-Origins & DIAS), Marco Nardecchia (DAMTP & Cavendish Laboratory, Cambridge), Francesco Sannino (CP3-Origins & DIAS), and Michael Spannowsky (IPPP, Durham)
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The Large Hadron Collider experiments are testing the evolution of the strong coupling αs up to the TeV scale. We show that the ratio of 3- to 2-jets cross sections provides a good determination of αs, even in the presence of new physics. The experimental measurements can then be used to place a model-independent bound on new particles carrying QCD colour charge and can constrain such states to be heavier than a few hundred GeVs.