Chiral symmetry breaking and the spin content of hadrons
arXiv:1111.2562 · doi:10.1016/j.ppnp.2011.12.035
Abstract
From the parton distributions in the infinite momentum frame one finds that only about 30% of the nucleon spin is carried by spins of the valence quarks, which gave rise to the term "spin crisis". Similar results hold for the lowest mesons, as it follows from the lattice simulations. We define the spin content of a meson in the rest frame and use a complete and orthogonal chiral basis and a unitary transformation from the chiral basis to the (2S+1)LJ basis. Then, given a mixture of different allowed chiral representations in the meson wave function at a given resolution scale, one can obtain its spin content at this scale. To obtain the mixture of the chiral representations in the meson we measure in dynamical lattice simulations a ratio of couplings of interpolarors with different chiral structure. For the rho meson we obtain practically the 3S1 state with no trace of the spin crisis. Then a natural question arises: which definition does reflect the spin content of a hadron?
7 pp, Presented at Int. School of Nuclear Physics: "From Quarks and Gluons to Hadrons and Nuclei", Erice-Sicily, 16 - 24 September, 2011
References in corpus (6)
- The Deuteron Spin-dependent Structure Function g1d and its First Moment
- Hadron Spectroscopy with Dynamical Chirally Improved Fermions
- Chiral symmetry and the string description of excited hadrons
- Angular momentum content of the rho-meson in lattice QCD
- Chiral symmetry breaking and the spin content of the rho and rho' mesons
- Effective chiral restoration in the rho'-meson in lattice QCD