The role of qqqqq components in the nucleon and the N(1440) resonance
Abstract
The role of q q components in the nucleon and the N(1440) resonance is studied by explicit coupling of the lowest positive parity qqqq q state to the qqq components in the harmonic oscillator quark model. The lowest energy qqqq q component, where the 4-quark subsystem has the flavor-spin symmetry [4]FS[22]F[22]S, is close in energy to the lowest positive parity excitation of the nucleon in the qqq quark model. The confining interaction leads to a strong mixing of the qqqq q system and the positive parity excited state of the qqq system. This result is in line with the phenomenological indications for a two-component structure of the N(1440) resonance. The presence of substantial q q components in the N(1440) can bring about a reconciliation of the constituent quark model with the large empirical decay width of the N(1440).
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.