Strong coupling constant from scaling violations in fragmentation functions.

@article{Kniehl2000StrongCC,
  title={Strong coupling constant from scaling violations in fragmentation functions.},
  author={Bernd A. Kniehl and Gustav Kramer and Bj{\"o}rn P{\"o}tter},
  journal={Physical review letters},
  year={2000},
  volume={85 25},
  pages={5288-91}
}
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-to-leading order, we find alpha(s)(5)(M(Z)) = 0.1170+/-0.0073. A new world average of alpha(s) is… CONTINUE READING