Speaker
Prof.
Mohammad Ebrahim Zomorrodian
(Ferdowsi University of Mashhad)
Description
coupling constant, nonperturbative QCD parameter, dispersive model.
Summary
Abstract: we study average of moments for event shapes in e^+ e^-→hadrons within the context of next to leading order (NLO) perturbative QCD prediction in dispersive model. Moments used in this article are <1-T>,〈ρ〉,〈B_T 〉 ,〈B_W 〉. We extract the coupling constant (α_s) in perturbative theory and α_0 in the non- perturbative theory using the dispersive model. By fitting the experimental data, we find the values of α_s (M_(Z^0 ))= 0.1171±0.00229 and α_0 (μ_I=2GeV)=0.5068±0.0440. Our results are consistent with the above model. Our results are also consistent with those obtained from other experiments at different energies. We explain all these features in this paper..
Primary author
Prof.
Mohammad Ebrahim Zomorrodian
(Ferdowsi University of Mashhad)
Co-author
Dr
Reihaneh Salehmoghaddam
(ferdowsi university of mashhad)
