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A Measurement of alpha-s from the scaling violation in e+ e- annihilation

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A Measurement of alpha-s from the scaling violation in e+ e- annihilation

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DELPHI Collaboration; Ferrer Soria, Antonio; Higón Rodríguez, Emilio; Castillo Giménez, María Victoria; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Cortina Gil, Eduardo; Fuster Verdú, Juan A.; García García, Carmen; Hernández Rey, Juan José; Lacasta Llácer, Carlos; Martínez Vidal, Fernando; Martí García, Salvador; Navas Concha, Sergio; Salt Cairols, José

Aquest document és un/a article, creat/da en: 1997

The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z0 decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at energies between 14 GeV and 91 GeV. A large scaling violation is observed, which is used to extract the strong coupling constant from a fit using a numerical integration of the second order DGLAP evolution equations. The result is αs(Mz) = 0.124+0.006-0.007 (exp) +/- 0.009 (theory) where the first error represents the experimental uncertainty and the second error is due to the factorization and renormalization scale dependence.

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