Excited nucleons with chirally improved fermions

Details Excited nucleons with chirally improved fermions Excited nucleons with chirally improved fermions

2003-07-05

arxiv.org/abs/hep-ph/0307073v3

Phys.Rev. D69 (2004) 094513

Physics

High Energy Physics

High Energy Physics - Phenomenology

Tables added, small modifications in the text

Scientific paper

10.1103/PhysRevD.69.094513

We study positive and negative parity nucleons on the lattice using the chirally improved lattice Dirac operator. Our analysis is based on a set of three operators chi_i with the nucleon quantum numbers but in different representations of the chiral group and with different diquark content. We use a variational method to separate ground state and excited states and determine the mixing coefficients for the optimal nucleon operators in terms of the chi_i. We clearly identify the negative parity resonances N(1535) and N(1650) and their masses agree well with experimental data. The mass of the observed excited positive parity state is too high to be interpreted as the Roper state. Our results for the mixing coefficients indicate that chiral symmetry is important for N(1535) and N(1650) states. We confront our data for the mixing coefficients with quark models and provide insights into the physics of the nucleon system and the nature of strong decays.

Affiliated with

Also associated with

No associations

Rating

Excited nucleons with chirally improved fermions 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 Excited nucleons with chirally improved fermions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excited nucleons with chirally improved fermions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-256512