The π+π+ scattering length from maximally twisted mass lattice QCD

Autor:	Xu Feng, Karl Jansen, Dru B. Renner
Rok vydání:	2010
Předmět:	Physics Nuclear and High Energy Physics Particle physics Chiral perturbation theory High Energy Physics::Lattice Nuclear Theory Lattice field theory Scattering length Lattice QCD Lattice constant Pion Lattice (order) Isospin High Energy Physics::Experiment Nuclear Experiment
Zdroj:	Physics Letters B. 684:268-274
ISSN:	0370-2693
DOI:	10.1016/j.physletb.2010.01.018
Popis:	We calculate the s-wave pion–pion scattering length in the isospin I = 2 channel in lattice QCD for pion masses ranging from 270 MeV to 485 MeV using two flavors of maximally twisted mass fermions at a lattice spacing of 0.086 fm . Additionally, we check for lattice artifacts with one calculation at a finer lattice spacing of 0.067 fm . We use chiral perturbation theory at next-to-leading order to extrapolate our results. At the physical pion mass, we find m π a π π I = 2 = − 0.04385 ( 28 ) ( 38 ) for the scattering length, where the first error is statistical and the second is our estimate of several systematic effects.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::90343625ec521a7650320ebd0e3f0a27 https://doi.org/10.1016/j.physletb.2010.01.018 Zobrazit plný text záznamu Full Text from ScienceDirect