1999/04/21 by Michael Krämer · 1 citation
Physics and Astronomy · #Coupling constant #Energy spectrum #High-Energy Particle Collisions Research #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Perturbation theory (quantum mechanics) #Perturbative QCD #Photon #Photon energy #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #Radiative transfer #Spectrum (functional analysis) #hep-ph
paper · pdf · doi:10.1103/physrevd.60.111503
published as Phys.Rev.D60:111503,1999 · Latex, 8 pages, 3 figures
arxiv created 1999/04/21 · openalex publication_date 1999/11/05 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We calculate the next-to-leading order perturbative QCD corrections to the photon energy spectrum in radiative \ensuremathΥ decays. The higher-order corrections significantly modify the shape of the spectrum, in particular at large photon energies, and thereby reduce the discrepancy between experimental data and previous leading-order predictions. The next-to-leading order calculation of the photon energy spectrum allows a more reliable determination of the strong coupling constant from radiative \ensuremathΥ decays by restricting the analysis to the region of the energy spectrum that can be described by NLO perturbation theory.