Determination of α s at NLO*+NNLL from a global fit of the low-z parton-to-hadron fragmentation functions in e and DIS collisions - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue EPJ Web of Conferences Année : 2015

Determination of α s at NLO*+NNLL from a global fit of the low-z parton-to-hadron fragmentation functions in e and DIS collisions

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The QCD coupling αs is determined from a combined analysis of experimental e+e− and e±p jet data confronted to theoretical predictions of the energy evolution of the parton-to-hadron fragmentation functions (FFs) moments –multiplicity, peak, width, skewness– at low fractional hadron momentum z. The impact of approximate next-to-leading order (NLO*) corrections plus next-to-next-to-leading log (NNLL) resummations, compared to previous LO+NLL calculations, is discussed. A global fit of the full set of existing data, amounting to 360 FF moments at collision energies √s ≈ 1–200 GeV, results in αs(mZ2) = 0.1189−0.0014+0.0025 at the Z mass.
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hal-01265585 , version 1 (01-02-2016)

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Redamy Pérez-Ramos, David D’enterria. Determination of α s at NLO*+NNLL from a global fit of the low-z parton-to-hadron fragmentation functions in e and DIS collisions. EPJ Web of Conferences, 2015, 90, pp.04001. ⟨10.1051/epjconf/20159004001⟩. ⟨hal-01265585⟩
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