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Title: Quark models of dibaryon resonances in nucleon-nucleon scattering

Abstract

We look for {delta}{delta} and N{delta} resonances by calculating NN scattering phase shifts of two interacting baryon clusters of quarks with explicit coupling to these dibaryon channels. Two phenomenological nonrelativistic chiral quark models giving similar low-energy NN properties are found to give significantly different dibaryon resonance structures. In the chiral quark model (ChQM), the dibaryon system does not resonate in the NNS waves, in agreement with the experimental SP07 NN partial-wave scattering amplitudes. In the quark delocalization and color screening model (QDCSM), the S-wave NN resonances disappear when the nucleon size b falls below 0.53 fm. Both quark models give an IJ{sup P}=03{sup +}{delta}{delta} resonance. At b=0.52 fm, the value favored by the baryon spectrum, the resonance mass is 2390 (2420) MeV for the ChQM with quadratic (linear) confinement, and 2360 MeV for the QDCSM. Accessible from the {sup 3}D{sub 3}{sup NN} channel, this resonance is a promising candidate for the known isoscalar ABC structure seen more clearly in the pn{yields}d{pi}{pi} production cross section at 2410 MeV in the recent preliminary data reported by the CELSIUS-WASA Collaboration. In the isovector dibaryon sector, our quark models give a bound or almost bound {sup 5}S{sub 2}{sup {delta}}{sup {delta}} state that can givemore » rise to a {sup 1}D{sub 2}{sup NN} resonance. None of the quark models used have bound N{delta}P states that might generate odd-parity resonances.« less

Authors:
;  [1];  [2];  [3];  [4]
  1. Department of Physics, Nanjing Normal University, Nanjing 210097 (China)
  2. Department of Physics, Southeast University, Nanjing 210094 (China)
  3. Department of Physics, Nanjing University, Nanjing 210093 (China)
  4. Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
21199542
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.79.024001; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHIRALITY; COLOR MODEL; COUPLING; CROSS SECTIONS; DIBARYONS; GEV RANGE 01-10; ISOVECTORS; MASS; NUCLEON-NUCLEON INTERACTIONS; NUCLEONS; PARITY; PHASE SHIFT; QUARK MODEL; QUARKS; RESONANCE; S WAVES; SCATTERING; SCATTERING AMPLITUDES; SCREENING; SPECTRA

Citation Formats

Ping, J L, Huang, H X, Pang, H R, Fan, Wang, and Wong, C W. Quark models of dibaryon resonances in nucleon-nucleon scattering. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.79.024001.
Ping, J L, Huang, H X, Pang, H R, Fan, Wang, & Wong, C W. Quark models of dibaryon resonances in nucleon-nucleon scattering. United States. https://doi.org/10.1103/PHYSREVC.79.024001
Ping, J L, Huang, H X, Pang, H R, Fan, Wang, and Wong, C W. 2009. "Quark models of dibaryon resonances in nucleon-nucleon scattering". United States. https://doi.org/10.1103/PHYSREVC.79.024001.
@article{osti_21199542,
title = {Quark models of dibaryon resonances in nucleon-nucleon scattering},
author = {Ping, J L and Huang, H X and Pang, H R and Fan, Wang and Wong, C W},
abstractNote = {We look for {delta}{delta} and N{delta} resonances by calculating NN scattering phase shifts of two interacting baryon clusters of quarks with explicit coupling to these dibaryon channels. Two phenomenological nonrelativistic chiral quark models giving similar low-energy NN properties are found to give significantly different dibaryon resonance structures. In the chiral quark model (ChQM), the dibaryon system does not resonate in the NNS waves, in agreement with the experimental SP07 NN partial-wave scattering amplitudes. In the quark delocalization and color screening model (QDCSM), the S-wave NN resonances disappear when the nucleon size b falls below 0.53 fm. Both quark models give an IJ{sup P}=03{sup +}{delta}{delta} resonance. At b=0.52 fm, the value favored by the baryon spectrum, the resonance mass is 2390 (2420) MeV for the ChQM with quadratic (linear) confinement, and 2360 MeV for the QDCSM. Accessible from the {sup 3}D{sub 3}{sup NN} channel, this resonance is a promising candidate for the known isoscalar ABC structure seen more clearly in the pn{yields}d{pi}{pi} production cross section at 2410 MeV in the recent preliminary data reported by the CELSIUS-WASA Collaboration. In the isovector dibaryon sector, our quark models give a bound or almost bound {sup 5}S{sub 2}{sup {delta}}{sup {delta}} state that can give rise to a {sup 1}D{sub 2}{sup NN} resonance. None of the quark models used have bound N{delta}P states that might generate odd-parity resonances.},
doi = {10.1103/PHYSREVC.79.024001},
url = {https://www.osti.gov/biblio/21199542}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 79,
place = {United States},
year = {2009},
month = {2}
}