The role of $qqqq\bar{q}$ components in the nucleon and the N(1440) resonance

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dc.creatorJulia-Diaz, B.
dc.creatorRiska, D. O.
dc.date2006-09-22
dc.date.accessioned2026-07-07T11:07:38Z
dc.date.available2026-07-07T11:07:38Z
dc.descriptionThe role of $q\bar q$ components in the nucleon and the N(1440) resonance is studied by explicit coupling of the lowest positive parity $qqqq\bar q$ state to the $qqq$ components in the harmonic oscillator quark model. The lowest energy $qqqq\bar q$ 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 $qqqq\bar q$ 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 $q\bar q$ 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).
dc.descriptionAccepted for publication in Nucl. Phys. A
dc.identifierhttps://arxiv.org/abs/nucl-th/0609064
dc.identifierhttp://arxiv.org/abs/nucl-th/0609064
dc.identifierNucl.Phys.A780:175-186,2006
dc.identifierdoi:10.1016/j.nuclphysa.2006.09.016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189907
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe role of $qqqq\bar{q}$ components in the nucleon and the N(1440) resonance
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