Abstract
We extract the value of the strong coupling constant from a single-parameter pointlike fit to the photon structure function at large and and from a first five-parameter full (pointlike and hadronic) fit to the complete data set taken at PETRA, TRISTAN, and LEP. In next-to-leading order and the renormalization and factorization schemes, we obtain (pointlike) and (pointlike and hadronic). We demonstrate that the data taken at LEP have reduced the experimental error by about a factor of 2, so that a competitive determination of from is now possible.
- Received 8 May 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.122004
©2002 American Physical Society