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Roper resonance information


The Roper resonance, also known as P11(1440) or N(1440)1/2+, is an unstable nucleon resonance with a mass of about 1,440 MeV/c2 and with a relatively wide full Breit-Wigner width Γ ≈ 300 MeV/c2. It contains three quarks (up (u) or down (d)) with total spin J = 1/2 and total isospin I = 1/2. In the quark model it is considered to be a radially excited three-quark state with radial quantum number N = 2 and positive parity. The Roper Resonance has been a subject of many studies because its mass is actually lower than three-quark states with radial quantum number N = 1. Only in the late 2000s was the lower-than-expected mass explained by theoretical calculations, revealing a quark core shielded by a dense cloud of mesons.[1]

  1. ^ Rodríguez-Quintero, José; Binosi, Daniele; Chen, Chen; Lu, Ya; Roberts, Craig D.; Segovia, Joge (2020). "Form factors for the Nucleon-to-Roper electromagnetic transition at large-Q2". European Physical Journal Web of Conferences. 241: 02009. arXiv:1909.13793. Bibcode:2020EPJWC.24102009R. doi:10.1051/epjconf/202024102009. S2CID 203593589.

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