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2010

Meson and baryon masses with low mode averaging

Bali, Gunnar, Castagnini, Luca, Collins, Sara

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We describe and test a method known in the literature as low mode averaging to improve Euclidean two-point functions in lattice QCD using the low-lying eigenmodes of the Wilson-Dirac operator D.

The contribution from the low modes is averaged over all positions of the quark sources while the contribution from high modes is calculated in the traditional way using one source point per lattice.
We apply this method to different baryon and meson two-point functions and we compare the improvements using the eigenmodes of the non-hermitian operator D and the eigenmodes of the hermitian operator Q=gamma5 D.
The convergence strongly depends on the parity of the states.

Meson and baryon masses with low mode averaging · Around

Built on

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M. Göckeler, R. Horsley, H. Perlt, P. E. L. Rakow, G. Schierholz, A. Schiller and P. Stephenson, Scaling of non-perturbatively O(a) improved Wilson fermions: hadron spectrum, quark masses and decay constants , Phys. Rev. D 57
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1998
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H. Neff, N. Eicker, T. Lippert, J. W. Negele and K. Schilling, On the low fermionic eigenmode dominance in QCD on the lattice , Phys. Rev. D 64
2001
Earlier work this paper cites.

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Then

V. Guerrero, R. B. Morgan and W. Wilcox, Eigenspectrum noise subtraction methods in lattice QCD , PoS LAT2009
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2009
Later among the works it cites.
G. S. Bali, S. Collins and A. Schäfer, Effective noise reduction techniques for disconnected loops in Lattice QCD , Comput. Phys. Commun. 181
Original
2010
Closest in time.

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