TY  - JOUR
AU  - Blanton, T. D.
AU  - Romero-Lopez, F.
AU  - Sharpe, S. R.
PY  - 2020
DA  - 2020//
TI  - I=3 Three-Pion Scattering Amplitude from Lattice QCD
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 032001
EP  - 7pp
VL  - 124
IS  - 3
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - https://arxiv.org/abs/1909.02973
UR  - https://doi.org/10.1103/PhysRevLett.124.032001
DO  - 10.1103/PhysRevLett.124.032001
LA  - English
N1  - WOS:000509506000002
ID  - Blanton_etal2020
ER  -