Mass and width of the lowest resonance in QCD

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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.
Revtex, 4 pages, 2 figures, two refences added, minor text changes, version appeared in Phys. Rev. Lett

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/177942

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-ph/0512364
 http://arxiv.org/abs/hep-ph/0512364
 Phys.Rev.Lett.96:132001,2006
 doi:10.1103/PhysRevLett.96.132001

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