Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-06
J.Phys.G26:600-606,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 7 pages, 2 eps figures, proceedings of the UK Phenomenology Workshop on Collider Physics, 19-24 September, Durham 1999,
Scientific paper
10.1088/0954-3899/26/5/313
We review the determination of the QED coupling at the Z pole, which is a crucial parameter for electroweak theory. We include recent e+e- -> hadron data from Novosibirsk and Beijing to re-evaluate alpha (M_Z^2). We find 1/alpha (M_Z^2) = 128.973 +/- 0.035 or 128.934 +/- 0.040 according, respectively, to whether inclusive or exclusive e+e- -> hadron data are used in the interval 1.4 < \sqrt{s} < 2.1 GeV. The error is mainly due to uncertainties in the data in the low energy region, \sqrt{s} < 2.5 GeV. We find that no advantage is obtained by analytic continuation of the dispersion relation into the complex s plane. We show that the hints of structure for \sqrt{s} ~ 2.5 GeV may be evidence of a non-perturbative gluonic contribution to R(s).
Martin A. D.
Outhwaite J. J.
Ryskin M. G.
No associations
LandOfFree
The R ratio in e+ e-, the determination of alpha(Mz^2) and a possible non-perturbative gluonic contribution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The R ratio in e+ e-, the determination of alpha(Mz^2) and a possible non-perturbative gluonic contribution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The R ratio in e+ e-, the determination of alpha(Mz^2) and a possible non-perturbative gluonic contribution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-573745