Robustness of the dispersive representation of Kπ form factors

✍ Scribed by Micaela Oertel

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 245 KB
• Volume: 186
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2008.12.074

✦ Synopsis

Some time ago a dispersive representation of the scalar Kπ form factor has been proposed. It does not only allow to limit the number of free parameters in the analysis of the experimental K l3 decay data on physically motivated ground, but the main interest is that it allows via the Callan-Treiman low-energy theorem to test the standard model precisely. This asks for a detailed study of the uncertainties of the dispersive representation which will be presented here. In addition, a dispesive representation of the vector form factor together with its uncertainties will be discussed.