Constraining Light Colored Particles with Event Shapes

View/ Open
Published Version
https://doi.org/10.1103/PhysRevLett.101.022002Metadata
Show full item recordCitation
Kaplan, David, and Matthew Schwartz. 2008. Constraining light colored particles with event shapes. Physical Review Letters 101(2): 022002.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.Other Sources
http://arxiv.org/PS_cache/arxiv/pdf/0804/0804.2477v1.pdfTerms of Use
This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAPCitable link to this page
http://nrs.harvard.edu/urn-3:HUL.InstRepos:8003958
Collections
- FAS Scholarly Articles [17584]
Contact administrator regarding this item (to report mistakes or request changes)