Mass and width of sigma(750) scalar meson from measurements of pi(-)p->pi(-)pi(+)n on polarized target

Details Mass and width of sigma(750) scalar meson from measurements of pi(-)p->pi(-)pi(+)n on polarized target Mass and width of sigma(750) scalar meson from measurements of pi(-)p->pi(-)pi(+)n on polarized target

1997-11-18

arxiv.org/abs/hep-ph/9711376v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures

Scientific paper

10.1063/1.55963

Model independent amplitude analyses of $\pi^- p_\uparrow \to \pi^- \pi^+ n$ on polarized target at 17.2 GeV/c reveal resonant structure of S-wave transversity amplitudes $|\bar S|^2\Sigma$ and $|S|^2\Sigma$ near 750 MeV. Simultaneous fit to $|\bar S|^2\Sigma$ and $|S|^2\Sigma$ with a single $\sigma$ pole yields $m_\sigma = 775 \pm 17$ MeV and $\Gamma_\sigma = 147 \pm 33$ MeV. Simultaneous fit with two common $\sigma$ poles yields a lower $\chi^2/dpt$. Their resonance parameters are $m_\sigma = 786 \pm 24$ MeV, $\Gamma_\sigma = 130 \pm 47$ MeV and $m_{\sigma^\prime} = 670 \pm 30$ MeV, $\Gamma_{\sigma^\prime} = 59 \pm 58$ MeV.

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