A new perspective on the Δ5/2+(2000)Δ_{5/2^{+}}(2000) puzzle

preprint2011arXivOpen access

Abstract

We argue that Δ5/2+(2000)(∗∗),Δ_{5/2^{+}}(2000)(\ast\ast), cataloged as a resonance in the Particle Data Book Review (PDG), should be interpreted instead as two distinctive resonances, Δ5/2+(∼1740)Δ_{5/2^{+}}(\sim1740) and Δ5/2+(∼2200)Δ_{5/2^{+}}(\sim2200). Our argument is based on a solution of the πΔρπΔρ problem in a Fixed Center Approximation (FCA) to the Fadeev equations. Δ5/2+(∼1740)Δ_{5/2^{+}}(\sim1740) can then be interpreted as a π−(Δρ)N(1675)π-(Δρ)_{N(1675)} bound state. As a corollary Δ1/2+(1750)(∗)Δ_{1/2^{+}}(1750)(\ast) can be understood as a πN1/2−(1650)πN_{1/2^{-}}(1650) bound state.

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