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Phys. Rev. D 57, 5434–5443 (1998)

Excited baryon phenomenology from large-Nc QCD

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Dan Pirjol* and Tung-Mow Yan†
Center for Theoretical Sciences, Physics Department, National Tsing Hua University, Hsinchu 30043, Taiwan, Republic of China

Received 19 November 1997; published in the issue dated 1 May 1998

We present a phenomenological analysis of the strong couplings of the negative-parity L=1 baryons from the perspective of the large-Nc expansion. In the large-Nc limit the mass spectrum and mixing pattern of these states are constrained in a very specific way. The mixing angles are completely determined in this limit, with predictions in good agreement with experiment. In the combined large-Nc and SU(3) limits the pion couplings of the five negative-parity octets to the ground state baryons are given in terms of only 3 independent couplings. The large-Nc predictions for the ratios of strong couplings are tested against experimental data.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.57.5434
DOI:
10.1103/PhysRevD.57.5434
PACS:
11.15.Pg, 13.75.Gx, 14.20.-c

*On leave from the Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.

†On leave from the Floyd R. Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853.

 
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