Mass and width of the lowest resonance in QCD
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
We demonstrate that near the threshold, the pi pi scattering amplitude contains a pole with the quantum numbers of the vacuum - commonly referred to as the sigma - and determine its mass and width within small uncertainties. Our derivation does not involve models or parametrizations, but relies on a straightforward calculation based on the Roy equation for the isoscalar S-wave.
Keywords
Cite
@article{arxiv.hep-ph/0512364,
title = {Mass and width of the lowest resonance in QCD},
author = {Irinel Caprini and Gilberto Colangelo and Heinrich Leutwyler},
journal= {arXiv preprint arXiv:hep-ph/0512364},
year = {2008}
}
Comments
Revtex, 4 pages, 2 figures, two refences added, minor text changes, version appeared in Phys. Rev. Lett