Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

The elastic I=1/2, s- and p-wave kaon-pion scattering amplitudes are calculated using a single ensemble of anisotropic lattice QCD gauge field configurations with Nf=2+1 flavors of dynamical Wilson-clover fermions at mπ=230 MeV. A large spatial extent of L=3.7 fm enables a good energy resolution whi...

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Veröffentlicht in:Nuclear physics. B 2018-07, Vol.932, p.29-51
Hauptverfasser: Brett, Ruairí, Bulava, John, Fallica, Jacob, Hanlon, Andrew, Hörz, Ben, Morningstar, Colin
Format: Artikel
Sprache:eng
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Zusammenfassung:The elastic I=1/2, s- and p-wave kaon-pion scattering amplitudes are calculated using a single ensemble of anisotropic lattice QCD gauge field configurations with Nf=2+1 flavors of dynamical Wilson-clover fermions at mπ=230 MeV. A large spatial extent of L=3.7 fm enables a good energy resolution while partial wave mixing due to the reduced symmetries of the finite volume is treated explicitly. The p-wave amplitude is well described by a Breit–Wigner shape with parameters mK⁎/mπ=3.808(18) and gK⁎KπBW=5.33(20) which are insensitive to the inclusion of d-wave mixing and variation of the s-wave parametrization. An effective range description of the near-threshold s-wave amplitude yields mπa0=−0.353(25).
ISSN:0550-3213
1873-1562
DOI:10.1016/j.nuclphysb.2018.05.008