Lasscock, B.Hedditch, J.Kamleh, W.Leinweber, D.Melnitchouk, W.Williams, A.Zanotti, J.2008-05-162008-05-162007Physical Review D: Particles, Fields, Gravitation and Cosmology, 2007; 76(5):054510-01-054510-081550-79980556-2821http://hdl.handle.net/2440/44293We 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.en©2007 American Physical SocietyHigh Energy Physics - Lattice (hep-lat)Journal article002007360110.1103/PhysRevD.76.0545100002497868000422-s2.0-3484885072846950Kamleh, W. [0000-0002-6177-5366]Leinweber, D. [0000-0002-4745-6027]Williams, A. [0000-0002-1472-1592]Zanotti, J. [0000-0002-3936-1597]