An analysis of the nucleon spectrum from lattice partially-quenched QCD

Abstract

The chiral extrapolation of the nucleon mass, M_n, is investigated using data coming from 2-flavour partially-quenched lattice simulations. A large sample of lattice results from the CP-PACS Collaboration is analysed using the leading one-loop corrections, with explicit corrections for finite lattice spacing artifacts. The extrapolation is studied using finite range regularised chiral perturbation theory. The analysis also provides a quantitative estimate of the leading finite volume corrections. It is found that the discretisation, finite-volume and partial quenching effects can all be very well described in this framework, producing an extrapolated value of M_n in agreement with experiment. Furthermore, determinations of the low energy constants of the nucleon mass's chiral expansion are in agreement with previous methods, but with significantly reduced errors. This procedure is also compared with extrapolations based on polynomial forms, where the results are less encouraging.

Now includes calculation of low energy constants of nucleon mass chiral extrapolation. 32 pages, 10 figures. Version accepted for publication.

References in corpus (4)

• Dynamical Twisted Mass Fermions with Light Quarks
• Strange Electric Form Factor of the Proton
• Axial coupling constant of the nucleon for two flavours of dynamical quarks in finite and infinite volume
• Convergence of the chiral expansion for the nucleon mass

Cited by in corpus (11)

• Taming the Pion Cloud of the Nucleon
• Strange magnetic form factor of nucleon in heavy baryon chiral effective approach at next to leading order
• Nucleon electromagnetic form factors with non-local chiral effective Lagrangian
• Searching for low-lying multi-particle thresholds in lattice spectroscopy
• Strange form factors of nucleon with nonlocal chiral effective Lagrangian
• The spin of the proton in chiral effective field theory
• Pure sea-quark contributions to the magnetic form factors of $\Sigma$ baryons
• Relativistic Hartree-Fock Chiral Lagrangians with confinement, nucleon finite size and short-range effects
• Chiral extrapolation of nucleon axial charge $g_A$ in effective field theory
• Chiral Analysis of the Nucleon Mass and Sigma Commutator
• From QCD phenomenology to nuclear physics phenomenology: the chiral confining model