| Texto completo | |
| Autor(es): |
Chen, Chen
;
El-Bennich, Bruno
;
Roberts, Craig D.
;
Schmidt, Sebastian M.
;
Segovia, Jorge
;
Wan, Shaolong
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 97, n. 3, p. 13-pg., 2018-02-15. |
| Resumo | |
A continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a comparative study of the four lightest (I = 1/2; J(P) = 1/2(+/-)) thorn baryon isospin doublets in order to elucidate their structural similarities and differences. Such analyses predict the presence of nonpointlike, electromagnetically active quark-quark (diquark) correlations within all baryons; and in these doublets, isoscalar-scalar, isovector-pseudovector, isoscalar-pseudoscalar, and vector diquarks can all play a role. In the two lightest (1/2, 1/2(+)) doublets, however, scalar and pseudovector diquarks are overwhelmingly dominant. The associated rest-frame wave functions are largely S-wave in nature; and the first excited state in this 1/2(+) channel has the appearance of a radial excitation of the ground state. The two lightest (1/2, 1/2(-)) doublets fit a different picture: accurate estimates of their masses are obtained by retaining only pseudovector diquarks; in their rest frames, the amplitudes describing their dressed-quark cores contain roughly equal fractions of even-and odd-parity diquarks; and the associated wave functions are predominantly P-wave in nature, but possess measurable S-wave components. Moreover, the first excited state in each negative-parity channel has little of the appearance of a radial excitation. In quantum field theory, all differences between positive-and negative-parity channels must owe to chiral symmetry breaking, which is overwhelmingly dynamical in the light-quark sector. Consequently, experiments that can validate the contrasts drawn herein between the structure of the four lightest (1/2, 1/2(+/-)) thorn doublets will prove valuable in testing links between emergent mass generation and observable phenomena and, plausibly, thereby revealing dynamical features of confinement. (AU) | |
| Processo FAPESP: | 15/21550-4 - QCD Forte no Continuo: Massas e Estrutura Partonia de Barions |
| Beneficiário: | Chen Chen |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |