Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-10-18
Commun. Theor. Phys. 57 (2012) 78
Physics
High Energy Physics
High Energy Physics - Lattice
Accepted in Communications in Theoretical Physics
Scientific paper
We study s-wave pion-pion ($\pi\pi$) scattering length in lattice QCD for pion masses ranging from 330 MeV to 466 MeV. In the "Asqtad" improved staggered fermion formulation, we measure full $\pi\pi$ four-point correlators for isospin I=0 and 2 channels, and use chiral perturbation theory at next-to-leading order to extrapolate our simulation results. Extrapolating to the physical pion mass yields scattering lengths as $m_\pi a_0^{I=2} = -0.0416(2)$ and $m_\pi a_0^{I=0} = 0.186(2)$ for isospin I=2 and 0 channels, respectively. Our lattice simulation for $\pi\pi$ scattering length in I=0 channel is an exploratory study, where we include the disconnected contribution, and our preliminary result is near to its experimental value. These simulations are carried out with MILC 2+1 flavor gauge configurations at lattice spacing $a \approx 0.15$ fm.
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