Pileup subtraction for jet shapes
arXiv:1211.2811 · doi:10.1103/PhysRevLett.110.162001
Abstract
Jet shapes have the potential to play a role in many LHC analyses, for example in quark-gluon discrimination or jet substructure analyses for hadronic decays of boosted heavy objects. Most shapes, however, are significantly affected by pileup. We introduce a general method to correct for pileup effects in shapes, which acts event-by-event and jet-by-jet, and accounts also for hadron masses. It involves a numerical determination, for each jet, of a given shape's susceptibility to pileup. Together with existing techniques for determining the level of pileup, this then enables an extrapolation to zero pileup. The method can be used for a wide range of jet shapes and we show its successful application in the context of quark/gluon discrimination and top-tagging.
5 pages, 2 figures
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- Measurement of the sum of WW and WZ production with W+dijet events in pp collisions at sqrt(s) = 7 TeV
- Measurement of electroweak production of two jets in association with a Z boson in proton-proton collisions at sqrt(s)= 8 TeV
- Aspects of Jets at 100 TeV
- The First Calculation of Fractional Jets
- On the use of charged-track information to subtract neutral pileup
- On Statistical Aspects of Qjets
- Tracking down hyper-boosted top quarks