2008/04/16 by David E. Kaplan, Matthew D. Schwartz · 4 citations
Physics and Astronomy · #Chemical physics #Colored #Event (particle physics) #Materials science #Optics #Particle physics theoretical and experimental studies #Physics #Quantum Mechanics and Applications #Quantum mechanics #hep-ph
paper · pdf · doi:10.1103/physrevlett.101.022002
published as Phys.Rev.Lett.101:022002,2008 · 4 pages, 2 figures
arxiv created 2008/04/16 · openalex publication_date 2008/07/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Using recently developed techniques for computing event shapes with soft-collinear effective theory, CERN Large Electron Positron Collider event shape data are 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 alphas 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 even shapes have a 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. This is nearly an order-of-magnitude improvement over the previous model-independent bound of 6.3 GeV.