Year: 2026
Type: preprint
Abstract: Exploring the anomalous dimensions, resummed through next-to-next-to-leading-logarithmic order, we study the first Mellin moments D_{q,g}(μ^2) of the quark and gluon fragmentation functions, which correspond to the average hadron multiplicities in jets initiated by quarks and gluons, respectively. By fitting the world data on D_{q,g}(μ^2) for charged hadrons measured in e^+e^- annihilation, we find a good agreement with the data and obtain the following value for the strong force coupling α_s^{(5)}(M_Z)=0.1177+0.0027-0.0025.
Source: arXiv (Cornell University)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223002771