Spectroscopy using the Anisotropic Clover Action
LHP Collaboration: R. G. Edwards, U. M. Heller, D. G. Richards
TL;DR
This paper demonstrates how anisotropic clover fermion actions in lattice QCD improve the calculation of the light-hadron spectrum, especially baryonic resonances like the Roper resonance, within the quenched approximation.
Contribution
It introduces the use of anisotropic lattice actions for more accurate determination of baryonic resonances in quenched QCD calculations.
Findings
Enhanced accuracy in baryonic resonance determination.
Effective tuning of action parameters using dispersion relations.
Clear advantages in calculating the Roper resonance.
Abstract
The calculation of the light-hadron spectrum in the quenched approximation to QCD using an anisotropic clover fermion action is presented. The tuning of the parameters of the action is discussed, using the pion and rho dispersion relation. The adoption of an anisotropic lattice provides clear advantages in the determination of the baryonic resonances, and in particular that of the so-called Roper resonance, the lightest radial excitation of the nucleon.
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