Substructure Dependence of Jet Cross Sections at Hera and Determination of Αs
نویسنده
چکیده
The substructure of jets has been studied in terms of the jet shape and subjet multiplicity and these quantities used to tag gluonand quark-initiated jets. Cross sections are presented for gluonand quark-tagged jets which exhibit the expected behaviour of the underlying parton dynamics. The value of αs(MZ ) of αs(MZ ) = 0.1176 ± 0.0009(stat.) +0.0009 −0.0026 (exp.) −0.0072 (th.) was extracted from the measurements of jet shapes in deep inelastic scattering.
منابع مشابه
NLO Corrections to Jet Cross Sections in DIS a
Next-to-leading order corrections to jet cross sections in deep inelastic scattering at HERA are studied. The predicted jet rates allow for a precise determination of αs(µ R) and the gluon density at HERA. We argue, that the " natural " renormal-ization and factorization scale is in general set by the average k B T of the jets in the Breit frame. Some implications for the associated forward jet...
متن کاملJet Production in Deep Inelastic Scattering at HERA ∗
Two-jet cross sections in deep inelastic scattering at HERA are calculated in next-to-leading order. The importance of higher order corrections and recombination scheme dependencies is studied for various jetalgorithms. Some implications for the determination of αs(μ 2 R), the determination of the gluon density and the associated forward jet production in the low x regime at HERA are briefly di...
متن کاملJet Cross-Sections and αS in DIS at HERA
Measurements of inclusive-jet and dijet cross-sections in high-Q deep-inelastic scattering are presented together with a short overview of extractions of the strong coupling parameter αS from jets. The data samples used were collected with the ZEUS detector at HERA-1 and HERA-2. The measured distributions are compared to QCD calculations in next-to-leading order which describe the data very wel...
متن کاملJet Physics and Event Shape Studies at Hera
A review is given of the latest results on jet production and studies of event shape variables in deep inelastic scattering at HERA. Jet cross sections studies for inclusive jet and dijet events are presented and compared to next-to-leading order QCD calculations. Extraction of the strong coupling constant αs is discussed.
متن کاملJets in deep-inelastic scattering at HERA
Jet cross sections in deep-inelastic scattering over a wide region of phase space have been measured at HERA. These cross section measurements provide a thorough test of the implementation of Quantum Chromodynamics in next-toleading order (NLO) calculations. They also provide the opportunity to test the consistency of the gluon distribution in the proton as extracted from (mainly) inclusive DIS...
متن کامل