English

Global parameterization of $\pi \pi$ scattering up to 2 GeV

High Energy Physics - Phenomenology 2019-12-18 v2 High Energy Physics - Experiment High Energy Physics - Lattice Nuclear Theory

Abstract

We provide global parameterizations of ππ\pi\pi scattering S0S0 and PP partial waves up to roughly 2 GeV for phenomenological use. These parameterizations describe the output and uncertainties of previous partial-wave dispersive analyses of ππ\pi\pi, both in the real axis up to 1.12 GeV and in the complex plane within their applicability region, while also fulfilling forward dispersion relations up to 1.43 GeV. Above that energy we just describe the available experimental data. Moreover, the analytic continuations of these global parameterizations also describe accurately the dispersive determinations of the σ/f0(500)\sigma/f_0(500), f0(980)f_0(980) and ρ(770)\rho(770) pole parameters.

Keywords

Cite

@article{arxiv.1907.13162,
  title  = {Global parameterization of $\pi \pi$ scattering up to 2 GeV},
  author = {J. R. Pelaez and A. Rodas and J. Ruiz de Elvira},
  journal= {arXiv preprint arXiv:1907.13162},
  year   = {2019}
}

Comments

18 pages, 8 figures