English

Plausible explanation of the $\Delta_{5/2^{+}}(2000)$ puzzle

Nuclear Theory 2011-05-26 v2 High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment

Abstract

From a Faddeev calculation for the π(Δρ)N5/2(1675)\pi-(\Delta\rho)_{N_{5/2^{-}}(1675)} system we show the plausible existence of three dynamically generated I(JP)=3/2(5/2+)I(J^{P})=3/2 (5/2^{+}) baryon states below 2.3 GeV whereas only two resonances, Δ5/2+(1905)()\Delta_{5/2^{+}}(1905)(\ast\ast\ast\ast) and Δ5/2+(2000)(),\Delta_{5/2^{+}}(2000)(\ast\ast), are cataloged in the Particle Data Book Review. Our results give theoretical support to data analyses extracting two distinctive resonances, Δ5/2+(1740)\Delta_{5/2^{+}}(\sim1740) and Δ5/2+(2200),\Delta_{5/2^{+}}(\sim2200), from which the mass of Δ5/2+(2000)()\Delta_{5/2^{+}}(2000)(\ast\ast) is estimated. We propose that these two resonances should be cataloged instead of Δ5/2+(2000).\Delta_{5/2^{+}}(2000). This proposal gets further support from the possible assignment of the other baryon states found in the approach in the I=1/2,3/2I=1/2,3/2 with JP=1/2+,3/2+,5/2+J^{P}=1/2^{+},3/2^{+},5/2^+ sectors to known baryonic resonances. In particular, Δ1/2+(1750)()\Delta_{1/2^{+}}(1750)(\ast) is naturally interpreted as a πN1/2(1650)\pi N_{1/2^{-}}(1650) bound state.

Keywords

Cite

@article{arxiv.1101.1722,
  title  = {Plausible explanation of the $\Delta_{5/2^{+}}(2000)$ puzzle},
  author = {Ju-Jun Xie and A. Martínez Torres and E. Oset and P. González},
  journal= {arXiv preprint arXiv:1101.1722},
  year   = {2011}
}

Comments

13 pages, 7 figures