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Physical Review D

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Even parity excitations of the nucleon in lattice QCD

B. G. Lasscock¹, J. N. Hedditch¹, W. Kamleh¹, D. B. Leinweber¹, W. Melnitchouk², A. G. Williams¹, and J. M. Zanotti³

¹Special Research Centre for the Subatomic Structure of Matter, Adelaide, South Australia 5005, Australia, and Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia
²Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA
³School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom

Phys. Rev. D 76, 054510 – Published 28 September, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.054510

Abstract

We study the spectrum of the even-parity excitations of the nucleon in quenched lattice QCD. We extend our earlier analysis by including an expanded basis of nucleon interpolating fields, increasing the physical size of the lattice, including more configurations to enhance statistics and probing closer to the chiral limit. With a review of world lattice data, we conclude that there is little evidence of the Roper resonance in quenched lattice QCD.

Article Text

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