skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Strong decays of excited baryons in Large Nc QCD

Abstract

We present the analysis of the strong decays widths of excited baryons in the framework of the 1/Nc expansion of QCD. These studies are performed up to order 1/Nc and include both positive and negative parity excited baryons.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
899825
Report Number(s):
JLAB-THY-05-473; DOE/ER/40150-5009
TRN: US0702056
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: VI Latin American Symposium On Nuclear Physics And Applications, Iguazu (Argentina), 3-7 October 2005
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BARYONS; NUCLEAR PHYSICS; PARITY; QUANTUM CHROMODYNAMICS

Citation Formats

Goity, Jose, and Scoccola, Norberto. Strong decays of excited baryons in Large Nc QCD. United States: N. p., 2007. Web.
Goity, Jose, & Scoccola, Norberto. Strong decays of excited baryons in Large Nc QCD. United States.
Goity, Jose, and Scoccola, Norberto. Thu . "Strong decays of excited baryons in Large Nc QCD". United States. doi:. https://www.osti.gov/servlets/purl/899825.
@article{osti_899825,
title = {Strong decays of excited baryons in Large Nc QCD},
author = {Goity, Jose and Scoccola, Norberto},
abstractNote = {We present the analysis of the strong decays widths of excited baryons in the framework of the 1/Nc expansion of QCD. These studies are performed up to order 1/Nc and include both positive and negative parity excited baryons.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • We present the analysis of the strong decays widths of excited baryons in the framework of the 1/Nc expansion of QCD. These studies are performed up to order 1/Nc and include both positive and negative parity excited baryons.
  • We present the analysis of the decay widths of excited baryons in the framework of the 1/Nc expansion of QCD. These studies are performed up to order 1/Nc and include both positive and negative parity excited baryons.
  • We use the 1/Nc expansion of QCD to analyse the spectrum of positive parity resonances with strangeness S = 0, -1, -2 and -3 in the 2-3 GeV mass region, supposed to belong to the [56,4+] multiplet. The mass operator is similar to that of [56,2+], previously studied in the literature. The analysis of the latter is revisited. In the [56,4+] multiplet we find that the spin-spin term brings the dominant contribution and that the spin-orbit term is entirely negligible in the hyperfine interaction, in agreement with the constituent quark model practice, where this interaction is usually neglected. More datamore » are strongly desirable, especially in the strange sector in order to fully exploit the power of this approach. We discuss possibilities of extending the calculations to other excited baryons belonging to the N = 2 or the N = 4 band.« less
  • The decays of non-strange positive parity baryons via emission of a pseudo-scalar meson are studied in the framework of the 1/Nc expansion to order 1/Nc. In particular, the pionic decays of the l=0 Roper baryons and of the l=2 baryons in the mass interval 1680-1950 MeV are analyzed using the available partial decay widths. Decay widths by emission of an eta meson are shown to be suppressed by a factor 1/Nc{sup 2} with respect to the pionic ones.
  • Based on a valence-quark picture of large N{sub c} baryons, I describe in some detail the 1/N{sub C} power counting for decays and spin-flavor configuration mixings in baryons.