Reanalysis of pion pion phase shifts from K -> pi pi decays

Details Reanalysis of pion pion phase shifts from K -> pi pi decays Reanalysis of pion pion phase shifts from K -> pi pi decays

2009-07-09

arxiv.org/abs/0907.1451v1

Phys.Lett.B679:445-448,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

10.1016/j.physletb.2009.08.027

We re-investigate the impact of isospin violation for extracting the s-wave pion pion scattering phase shift difference delta_0(M_K) - delta_2(M_K) from K -> pi pi decays. Compared to our previous analysis in 2003, more precise experimental data and improved knowledge of low-energy constants are used. In addition, we employ a more robust data-driven method to obtain the phase shift difference delta_0(M_K) - delta_2(M_K) = (52.5 \pm 0.8_{exp} \pm 2.8_{theor}) degrees.

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