Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation
| dc.creator | Martin, A. D. | |
| dc.creator | Outhwaite, J. | |
| dc.creator | Ryskin, M. G. | |
| dc.date | 2000-12-18 | |
| dc.date | 2001-02-12 | |
| dc.date.accessioned | 2026-07-07T12:26:09Z | |
| dc.date.available | 2026-07-07T12:26:09Z | |
| dc.description | The standard determination of the QED coupling on the Z pole is performed using the latest available data for R. The direct application of analytic continuation techniques is found not to improve the accuracy of the value of α(M_Z^2). However they help to resolve an ambiguity in the values of R in the energy region \sqrt{s} < 2 GeV, which, in turn, reduces the uncertainty in α(M_Z^2). Moreover, they provide a sensitive determination of the mass of the charm quark. The favoured solution, which uses the inclusive data for R for \sqrt{s} < 2 GeV, has a pole mass m_c = 1.33-1.40 GeV and α^{-1}(M_Z^2) = 128.972 +/- 0.026; whereas if the sum of the exclusive channels is used to determine R in this region, we find α^{-1}(M_Z^2) = 128.941 +/- 0.029. | |
| dc.description | LaTeX, 23 pages, 7 eps figures, typos removed, accepted by Eur. Phys. J. C | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0012231 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0012231 | |
| dc.identifier | Eur.Phys.J.C19:681-691,2001 | |
| dc.identifier | doi:10.1007/s100520100598 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/214790 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation | |
| dc.type | text |