%0 Journal Article
%T I=3 Three-Pion Scattering Amplitude from Lattice QCD
%A Blanton, T. D.
%A Romero-Lopez, F.
%A Sharpe, S. R.
%J Physical Review Letters
%D 2020
%V 124
%N 3
%I Amer Physical Soc
%@ 0031-9007
%G English
%F Blanton_etal2020
%O WOS:000509506000002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4264), last updated on Fri, 07 Feb 2020 07:47:12 +0000
%X We analyze the spectrum of two- and three-pion states of maximal isospin obtained recently for isosymmetric QCD with pion mass M approximate to 200 MeV in Horz and Hanlon, [Phys. Rev. Lett. 123, 142002 (2019)]. Using the relativistic three-particle quantization condition, we find similar to 2 sigma evidence for a nonzero value for the contact part of the 3 pi(+) (I = 3) scattering amplitude. We also compare our results to leading-order chiral perturbation theory. We find good agreement at threshold and some tension in the energy dependent part of the 3 pi(+) scattering amplitude. We also find that the 2 pi(+) (I = 2) spectrum is fit well by an s-wave phase shift that incorporates the expected Adler zero.
%R 10.1103/PhysRevLett.124.032001
%U https://arxiv.org/abs/1909.02973
%U https://doi.org/10.1103/PhysRevLett.124.032001
%P 032001-7pp