P. González

Publications (4)1.71 Total impact

• Source

  Available from: arxiv.org

  Article: Δρπ Interaction Leading to N* and Δ* Resonances

  Ju-Jun Xie, A. Martínez Torres, E. Oset, P. González
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  ABSTRACT: We have performed a calculation for the three-body Δρπ system by using the fixed center approximation to Faddeev equations, taking the interaction between Δ and ρ, Δ and π, and ρ and π from the chiral unitary approach. We find several peaks in the modulus squared of the three-body scattering amplitude, indicating the existence of resonances, which can be associated to known I=1/2, 3/2 and J P =1/2+, 3/2+ and 5/2+ baryon states.
  Few-Body Systems 04/2012; 50(1):223-225. · 1.44 Impact Factor
• Source

  Available from: ArXiv

  Article: A new perspective on the $\Delta_{5/2^{+}}(2000)$ puzzle

  P. González, Ju-Jun Xie, A. Martínez Torres, E. Oset
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  ABSTRACT: We argue that $\Delta_{5/2^{+}}(2000)(\ast\ast),$ cataloged as a resonance in the Particle Data Book Review (PDG), should be interpreted instead as two distinctive resonances, $\Delta_{5/2^{+}}(\sim1740)$ and $\Delta_{5/2^{+}}(\sim2200)$. Our argument is based on a solution of the $\pi\Delta\rho$ problem in a Fixed Center Approximation (FCA) to the Fadeev equations. $\Delta_{5/2^{+}}(\sim1740)$ can then be interpreted as a $\pi-(\Delta \rho)_{N(1675)}$ bound state. As a corollary $\Delta_{1/2^{+}}(1750)(\ast)$ can be understood as a $\pi N_{1/2^{-}}(1650)$ bound state.
  08/2011;
• Source

  Available from: ArXiv

  Article: Plausible explanation for the Δ_ {5/2^{+}}(2000) puzzle

  Ju-Jun Xie, A. Martínez Torres, E. Oset, P. González
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  ABSTRACT: From a Faddeev calculation for the π-(Δρ)N5/2-(1675) system we show the plausible existence of three dynamically generated I(JP)=3/2(5/2+) baryon states below 2.3 GeV, whereas only two resonances, Δ5/2+(1905)(****) and Δ5/2+(2000)(**), are cataloged in the Particle Data Book Review. Our results give theoretical support to data analyses extracting two distinctive resonances, Δ5/2+(~1740) and Δ5/2+(~2200), from which the mass of Δ5/2+(2000)(**) is estimated. We propose that these two resonances should be cataloged instead of Δ5/2+(2000). This proposal gets further support from the possible assignment of the other baryon states found in the approach in the I=1/2,3/2 with JP=1/2+,3/2+,5/2+ sectors to known baryonic resonances. In particular, Δ1/2+(1750)(*) is naturally interpreted as a πN1/2-(1650) bound state.
  Phys. Rev. C. 01/2011; 83(5).
• Source

  Available from: arxiv.org

  Article: An explanation of the ΔD35 (1930) as a σΔ bound state

  P. González, E. Oset, J. Vijande
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  ABSTRACT: Constituent quark models based on two-body potentials systematically overpredict the mass of ΔD35 (1930). A possible solution to this problem comes out from the application of a schematic hybrid model, containing three-quark as well as meson-baryon components, to the light-quark baryon spectrum. The ΔD35 (1930) and its partners ΔD33 (1940) and ΔD31 (1900) are found to contain a significant σΔ component. Then, through the use of the hidden gauge formalism, it is shown that these resonances can be dynamically generated from the σ-Δ interaction. In particular ΔD35 (1930) can be interpreted as being essentially a σΔ bound state. This interpretation suggests that the inclusion of σΔ as an effective inelastic channel in data analyses could improve the extraction and identification of the resonance.
  Chinese Physics C 01/2010; 33(12):1267. · 0.27 Impact Factor