Power corrections and Landau singularity
| dc.creator | Grunberg, G. | |
| dc.date | 1997-05-12 | |
| dc.date.accessioned | 2026-07-25T19:51:51Z | |
| dc.description | In the dispersive approach of Dokshitzer, Marchesini and Webber, standard power-behaved contributions of infrared origin are described with the notion of an infrared regular QCD coupling. I argue that their framework suggests the existence of non-standard contributions, arising from short distances (hence unrelated to renormalons and the operator product expansion), which appear in the process of removing the Landau singularity of the perturbative coupling. A natural definition of an infrared finite perturbative coupling is suggested within the dispersive method. Implications for the tau hadronic width and the lattice determination of the gluon condensate, where $O(1/Q^2)$ contributions can be generated, are pointed out. | |
| dc.description | 46 pages, latex, no figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9705290 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9705290 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/67689 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Power corrections and Landau singularity | |
| dc.type | text |