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Abstract:

We study the hierarchy of the coefficients in the 1/Nc expansion for the negative parity L=1 excited baryons from the perspective of the constituent quark model. This is related to the problem of determining the spin-flavor structure of the quark interaction. The most general two-body scalar interaction between quarks contains the spin-flavor structures t1at2a,s →1•s→2 and s→1•s →2t1at2a. We show that in the limit of a zero range interaction all these structures are matched onto the same hadronic mass operator Sc2, which gives a possible explanation for the dominance of this operator in the 1/N c expansion for the L=1 states and implies that in this limit it is impossible to distinguish between these different spin-flavor structures. Modeling a finite range interaction through the exchange of a vector and pseudoscalar meson, we propose a test for the spin-flavor dependence of the quark forces. For the scalar part of the quark interaction, we find that both pion exchange and gluon exchange are compatible with the data. © 2010 The American Physical Society.

Registro:

Documento: Artículo
Título:1/Nc expansion and the spin-flavor structure of the quark interaction in the constituent quark model
Autor:Pirjol, D.; Schat, C.
Filiación:National Institute for Physics and Nuclear Engineering, Department of Particle Physics, 077125 Bucharest, Romania
Department of Physics and Astronomy, Ohio University, Athens, OH 45701, United States
CONICET - Departamento de Física, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 1, 1428 Buenos Aires, Argentina
Año:2010
Volumen:82
Número:11
DOI: http://dx.doi.org/10.1103/PhysRevD.82.114005
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v82_n11_p_Pirjol

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Citas:

---------- APA ----------
Pirjol, D. & Schat, C. (2010) . 1/Nc expansion and the spin-flavor structure of the quark interaction in the constituent quark model. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(11).
http://dx.doi.org/10.1103/PhysRevD.82.114005
---------- CHICAGO ----------
Pirjol, D., Schat, C. "1/Nc expansion and the spin-flavor structure of the quark interaction in the constituent quark model" . Physical Review D - Particles, Fields, Gravitation and Cosmology 82, no. 11 (2010).
http://dx.doi.org/10.1103/PhysRevD.82.114005
---------- MLA ----------
Pirjol, D., Schat, C. "1/Nc expansion and the spin-flavor structure of the quark interaction in the constituent quark model" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 82, no. 11, 2010.
http://dx.doi.org/10.1103/PhysRevD.82.114005
---------- VANCOUVER ----------
Pirjol, D., Schat, C. 1/Nc expansion and the spin-flavor structure of the quark interaction in the constituent quark model. Phys Rev D Part Fields Gravit Cosmol. 2010;82(11).
http://dx.doi.org/10.1103/PhysRevD.82.114005