Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-09-02
Phys.Lett. B604 (2004) 74-81
Physics
High Energy Physics
High Energy Physics - Lattice
version to apper in Phys. Lett. B; additions in the presentation of the method; 3 references added; no change in the results a
Scientific paper
10.1016/j.physletb.2004.10.041
We present a new method for extracting excited states from a single two-point correlation function calculated on the lattice. Our method simply combines the correlation function evaluated at different time slices so as to ``subtract'' the leading exponential decay (ground state) and to give access to the first excited state. The method is applied to a quenched lattice study (volume = 24^3 x 64, beta = 6.2, 1/a = 2.55 GeV) of the first excited state of the nucleon using the local interpolating operator O = [uT C gamma5 d] u. The results are consistent with the identification of our extracted excited state with the Roper resonance N'(1440). The switching of the level ordering with respect to the negative-parity partner of the nucleon, N*(1535), is not seen at the simulated quark masses and, basing on crude extrapolations, is tentatively expected to occur close to the physical point.
Guadagnoli Diego
Papinutto Mauro
Simula Silvano
No associations
LandOfFree
Extracting excited states from lattice QCD: the Roper resonance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extracting excited states from lattice QCD: the Roper resonance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extracting excited states from lattice QCD: the Roper resonance will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-171911