title: Multipion systems in lattice QCD and the three-pion interaction.
abstract: The ground-state energies of 2, 3, 4, and 5 pi(+)'s in a spatial volume V approximately (2.5 fm)(3) are computed with lattice QCD. By eliminating the leading contribution from three-pi(+) interactions, particular combinations of these n-pi(+) ground-state energies provide precise extractions of the pi(+)pi(+) scattering length in agreement with that obtained from calculations involving only two pi(+)'s. The three-pi(+) interaction can be isolated by forming other combinations of the n-pi(+) ground-state energies. We find a result that is consistent with a repulsive three-pi(+) interaction for m_(pi) less, similar352 MeV.
authors: Department of Physics, University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
authors: Silas R
authors: SR
authors: Beane
authors: William
authors: W
authors: Detmold
authors: Thomas C
authors: TC
authors: Luu
authors: Kostas
authors: K
authors: Orginos
authors: Martin J
authors: MJ
authors: Savage
authors: Aaron
authors: A
authors: Torok