@Article{Romero-Lopez_etal2018,
author="Romero-Lopez, F.
and Rusetsky, A.
and Urbach, C.",
title="Two- and three-body interactions in phi 4 theory from lattice simulations",
journal="European Physical Journal C",
year="2018",
publisher="Springer",
volume="78",
number="10",
pages="846 - 15pp",
abstract="We calculate the one-, two- and three-particle energy levels for different lattice volumes in the complex phi(4) theory on the lattice. We argue that the exponentially suppressed finite-volume corrections for the two- and three-particle energy shifts can be reduced significantly by using the single particle mass, which includes the finite-size effects. We show numerically that, for a set of bare parameters, corresponding to the weak repulsive interaction, one can reliably extract the two- and three-particle energy shifts. From those, we extract the scattering length, the effective range and the effective three-body coupling. We show that the parameters, extracted from the two- and three-particle energy shifts, are consistent. Moreover, the effective three-body coupling is significantly different from zero.",
optnote="WOS:000448080300003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3778), last updated on Wed, 07 Nov 2018 12:15:02 +0000",
issn="1434-6044",
doi="10.1140/epjc/s10052-018-6325-8",
opturl="http://arxiv.org/abs/1806.02367",
opturl="https://doi.org/10.1140/epjc/s10052-018-6325-8",
archivePrefix="arXiv",
eprint="1806.02367",
language="English"
}