Measurement of the Longitudinal Cross-Section using the Direction of the Thrust Axis in Hadronic Events at LEP
The OPAL Collaboration, G. Abbiendi et al
Abstract
In the process e+e- to hadrons, one of the effects of gluon emission is to modify the 1+cos(theta)**2 form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be 0.0127+-0.0016+-0.0013 at the parton level, in good agreement with the expectation of QCD computed to Order(alphas**2) Comparisions at the hadron level with Monte Carlo models are presented. The dependence of the longitudinal cross-section on the value of thrust has also been studied, and provides a new test of QCD.
Create a lesson
Related papers
A machine-learning method for the estimation of the background from jets misidentified as hadronic tau lepton decays
CMS Collaboration
Recent results in b → s\, transitions at LHCb
Juan Jose Juan Castella
Determination of U-spin breaking parameters with an amplitude analysis of the decay D0 KS,L0π+π-
BESIII Collaboration, M. Ablikim, M. N. Achasov et al.
Observation of a Threshold Enhancement in the π0π0 Mass Spectrum in ψ(3686) → π0π0J/ψ Decays
BESIII Collaboration, M. Ablikim, M. N. Achasov et al.
HepUKE: Uncertainty-aware Knowledge Evolution for High Energy Physics Analysis Agents
Zijie Shang, Ke Li, Junkun Jiao et al.
A compact, interrogable Tree Tensor Network Jet Tagger on Lund declustering trees
Fabrizio Napolitano, Luca Della Penna, Tommaso Tedeschi et al.