2014/11/30 by A. V. Kotikov, Kotikov, A. V.
Mathematics · Physics and Astronomy · #Algorithm #FOS: Physical sciences #Factorization #Gluon #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Jet (fluid) #Mathematical physics #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Renormalization #Resummation #Weierstrass factorization theorem #hep-ph
paper · pdf · doi:10.48550/arxiv.1412.0224
14 pages, 3 figures, talk given on the conference "Quark Confinement and Hadron Spectrum XI", September 7-12, St. Petersburg, Russia
arxiv created 2014/11/30 · openalex publication_date 2014/11/30 · arxiv updated 2014/12/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We show the results in [1,2] for computing the QCD contributions to the scale evolution of average gluon and quark jet multiplicities. The new results came due a recent progress in timelike small-x resummation obtained in the MSbar factorization scheme. They depend on two nonperturbative parameters with clear and simple physical interpretations. A global fit of these two quantities to all available experimental data sets demonstrates by its goodness how our results solve a longstandig problem of QCD. Including all the available theoretical input within our approach, alphas(Mz)=0.1199 +- 0.0026 has been obtained in the MSbar scheme in an approximation equivalent to next-to-next-to-leading order enhanced by the resummations of ln x terms through the NNLL level and of ln Q2 terms by the renormalization group. This result is in excellent agreement with the present world average.