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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.

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  • 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. (en)
  • La résonance de Roper, connue sous la nomenclature P11(1440) ou N(1440)1/2+, est un baryon instable avec une masse d'environ 1 440 MeV·c-2. (fr)
  • ローパー共鳴(ローパーきょうめい、英: Roper resonance)とは、核子の励起状態(共鳴状態)の中で最も低い質量(エネルギー)をとるハドロン状態である。アップクォークとダウンクォークから構成され、質量は約1,440 MeV/c2、全崩壊幅は約300MeV/c2、核子と同様に全角運動量1/2、アイソスピン1/2、正パリティをとる。名称は発見者L. David Roperに由来し、便宜的には、N*(1440)、P11(1440)などとも表記される。 この共鳴の質量は、単純な構成子クォーク模型では予言できないため、長年の間、ハドロン物理学の理論研究における難問の一つとして知られている。 (ja)
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  • 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. (en)
  • La résonance de Roper, connue sous la nomenclature P11(1440) ou N(1440)1/2+, est un baryon instable avec une masse d'environ 1 440 MeV·c-2. (fr)
  • ローパー共鳴(ローパーきょうめい、英: Roper resonance)とは、核子の励起状態(共鳴状態)の中で最も低い質量(エネルギー)をとるハドロン状態である。アップクォークとダウンクォークから構成され、質量は約1,440 MeV/c2、全崩壊幅は約300MeV/c2、核子と同様に全角運動量1/2、アイソスピン1/2、正パリティをとる。名称は発見者L. David Roperに由来し、便宜的には、N*(1440)、P11(1440)などとも表記される。 この共鳴の質量は、単純な構成子クォーク模型では予言できないため、長年の間、ハドロン物理学の理論研究における難問の一つとして知られている。 (ja)
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  • Résonance de Roper (fr)
  • ローパー共鳴 (ja)
  • Roper resonance (en)
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