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

A. Pich; G. Ecker; V. Cirigliano

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arxiv 0907.1451 v1 pith:PBOAIO5T submitted 2009-07-09 hep-ph

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

V. Cirigliano , G. Ecker , A. Pich This is my paper

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keywords deltapionphasedecaysdifferenceshiftadditionanalysis

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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.

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

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