fs.a0: Finite Size Corrections to \(q\cot\delta\) for I=2
\(\pi\pi\) near threshold
Description
fs.qcotdelta computes the finite size corrections to
\(q\cot\delta\) while fs.mpia0 computes the
corresponding finite size corrections to \(M_\pi a_0\) directly
using the Gasser Leutwyler result from \(M_\pi\).
Usage
fs.a0(a0, mps, L)
Arguments
a0
scattering length at finite L
mps
pion mass as a scalar variable (must not be a vector)
L
spatial lattice extent as a scalar variable (must not be a vector)
Value
returns a numeric value representing the finite size correction or
in case of fs.a0 the corrected value for a0.
References
For the original formula see Eq. (31) from hep-lat/0601033