Constraining Light Colored Particles with Event Shapes

Abstract

Using recently developed techniques for computing event shapes with Soft-Collinear Effective Theory, LEP event shape data is used to derive strong model-independent bounds on new colored particles. In the effective field theory computation, colored particles contribute in loops not only to the running of alpha_s but also to the running of hard, jet and soft functions. Moreover, the differential distribution in the effective theory explicitly probes many energy scales, so event shapes have strong sensitivity to new particle thresholds. Using thrust data from ALEPH and OPAL, colored adjoint fermions (such as a gluino) below 51.0 GeV are ruled out to 95% confidence level. This is nearly an order-of-magnitude improvement over the previous model-independent bound of 6.3 GeV.

4 pages, 2 figures

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• Constraining new coloured matter from the ratio of 3- to 2-jets cross sections at the LHC
• Higgs Couplings at High Scales
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• Odd Tracks at Hadron Colliders
• Mono-jet Signatures of Gluphilic Scalar Dark Matter
• Flavor and CP Violation from a QCD-like Hidden Sector
• Establishing the Isolated Standard Model
• Phenomenology of General Gauge Mediation in light of a 125 GeV Higgs
• Closing the light gluino gap with electron-proton colliders
• A note on the CDF high-p_t charged particle excess
• Transverse Energy-Energy Correlator for Vector Boson-Tagged Hadron Production in $pp$ and $pA$ collisions
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