Measurement of αs from scaling violations in fragmentation functions in e+e− annihilation
نویسندگان
چکیده
منابع مشابه
Scaling Violations of Quark and Gluon Jet Fragmentation Functions in Ee Annihilations
Hadron production in high energy collisions can be described by parton showers, followed by the formation of hadrons which cannot be described perturbatively. Gluon emission, the dominant process in parton showers, is proportional to the colour factor associated with the coupling of the emitted gluon to the emitter. These colour factors are CA = 3 when the emitter is a gluon and CF = 4/3 when i...
متن کاملStrong coupling constant from scaling violations in fragmentation functions.
We present a new determination of the strong coupling constant alpha(s) through the scaling violations in the fragmentation functions for charged pions, charged kaons, and protons. In our fit we include the latest e+e- annihilation data from CERN LEP1 and SLAC SLC on the Z-boson resonance and older, yet very precise, data from SLAC PEP at center-of-mass energy sqaure root of s = 29 GeV. At next...
متن کاملScaling Violation in the Fragmentation Functions in e+e−-Annihilation
A determination of the hadronic fragmentation functions of the Z0 boson is presented from a study of the inclusive hadron production wit the DELPHI detector at LEP. These fragmentation functions were compared with the ones at lower energies, thus covering data in a large kinematic range: 196 ≤ Q2 ≤ 8312 GeV 2 and x(= ph/Ebeam) > 0.08. A large scaling violation was observed, which was used to ex...
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We describe a determination of the strong coupling αs(MZ) from scaling violations of the nonsinglet DIS structure function, which is based on two novel techniques aimed at controlling and minimizing the theoretical error: a neural network parametrization of BCDMS and NMC data, and QCD evolution by means of truncated Mellin moments.
متن کاملDetermination of αS from scaling violations of truncated moments of structure functions
We determine the strong coupling αS(MZ) from scaling violations of truncated moments of the nonsinglet deep inelastic structure function F2. Truncated moments are determined from BCDMS and NMC data using a neural network parametrization which retains the full experimental information on errors and correlations. Our method minimizes all sources of theoretical uncertainty and bias which character...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(95)00917-a