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Lattice determination of I=0 and 2 ππ scattering phase shifts with a physical pion mass

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Blum, T. ; Boyle, P. A. ; Bruno, M. ; Christ, N. H. ; Hoying, D. ; Kelly, C. ; Lehner, C. ; Mawhinney, R. D. ; Meyer, A. S. ; Murphy, D. J. ; Sachrajda, C. T. ; Soni, A. ; Wang, T.
License: Creative Commons Attribution 4.0
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Date of publication of this fulltext: 20 Feb 2022 13:56


Phase shifts for s-wave MM scattering in both the I = 0 and I = 2 channels are determined from a lattice QCD calculation performed on 741 gauge configurations obeying G-parity boundary conditions with a physical pion mass and lattice size of 32(3) x 64. These results support our recent 2021 study of direct CP violation in K -> pi pi decay, improving our earlier 2015 calculation. The phase shifts ...


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