Isospin-0 $\pi\pi$ scattering from twisted mass lattice QCD

@article{Liu2017Isospin0S,
  title={Isospin-0 \$\pi\pi\$ scattering from twisted mass lattice QCD},
  author={Liuming Liu and Simone Bacchio and P. Dimopoulos and Jacob Finkenrath and R. Frezzotti and Christopher Helmes and Christian Jost and Bastian Knippschild and Bartosz Kostrzewa and Hongxia Liu and K. Ottnad and Marcus Petschlies and Carsten Urbach and Markus Werner},
  journal={arXiv: High Energy Physics - Lattice},
  year={2017}
}
We present results for the isospin-0 $\pi\pi$ s-wave scattering length calculated in twisted mass lattice QCD. We use three $N_f = 2$ ensembles with unitary pion mass at its physical value, 240~MeV and 330~MeV respectively. We also use a large set of $N_f = 2 + 1 +1$ ensembles with unitary pion masses varying in the range of 230~MeV - 510~MeV at three different values of the lattice spacing. A mixed action approach with the Osterwalder-Seiler action in the valence sector is adopted to… Expand
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