TY  - JOUR
AU  - Blanton, T. D.
AU  - Hanlon, A. D.
AU  - Ben Horz
AU  - Morningstar, C.
AU  - Romero-Lopez, F.
AU  - Sharpe, S. R.
PY  - 2021
DA  - 2021//
TI  - Interactions of two and three mesons including higher partial waves from lattice QCD
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 023
EP  - 59pp
VL  - 10
IS  - 10
PB  - Springer
KW  - Lattice QCD
KW  - Scattering Amplitudes
AB  - We study two- and three-meson systems composed either of pions or kaons at maximal isospin using Monte Carlo simulations of lattice QCD. Utilizing the stochastic LapH method, we are able to determine hundreds of two- and three-particle energy levels, in nine different momentum frames, with high precision. We fit these levels using the relativistic finite-volume formalism based on a generic effective field theory in order to determine the parameters of the two- and three-particle K-matrices. We find that the statistical precision of our spectra is sufficient to probe not only the dominant s-wave interactions, but also those in d waves. In particular, we determine for the first time a term in the three-particle K-matrix that contains two-particle d waves. We use three N-f = 2 + 1 CLS ensembles with pion masses of 200, 280, and 340 MeV. This allows us to study the chiral dependence of the scattering observables, and compare to the expectations of chiral perturbation theory.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2106.05590
UR  - https://doi.org/10.1007/JHEP10(2021)023
DO  - 10.1007/JHEP10(2021)023
LA  - English
N1  - WOS:000704432600004
ID  - Blanton_etal2021
ER  -