Low-energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>Λ</mml:mi><mml:mi>η</mml:mi></mml:mrow></mml:math>reaction and the negative parity<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>resonances

Xiao, Li-Ye; Zhong, X.

doi:10.1103/physrevc.88.065201

Cited by 9 publications

(5 citation statements)

References 88 publications

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“…The chiral quark model has been well developed and widely applied to meson photoproduction reactions [38,[43][44][45][46][47][48][49][50][51][52][53][54]. Recently, this model has been successfully extended to πN and KN reactions as well [55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Neutral pion photoproduction on the nucleon in a chiral quark model

2015

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A chiral quark-model approach is adopted to study the γp → π 0 p and γn → π 0 n reactions. Good descriptions of the total and differential cross sections and single-polarization observables are obtained from the pion production threshold up to the second resonance region. It is found that (i) the n = 0 shell resonance ∆(1232)P 33 , the n = 1 shell resonances N(1535)S 11 and N(1520)D 13 , and the n = 2 shell resonance N(1720)P 13 play crucial roles in these two processes. They are responsible for the first, second and third bump structures in the cross sections, respectively. (ii) Furthermore, obvious evidences of N(1650)S 11 and ∆(1620)S 31 are also found in the reactions. They notably affect the cross sections and the polarization observables from the second resonance region to the third resonance region. (iii) The u-channel background plays a crucial role in the reactions. It has strong interferences with the s-channel resonances. (iv) The t-channel background seems to be needed in the reactions. Including the t-channel vector-meson exchange contribution, the descriptions in the energy region E γ = 600 ∼ 900 MeV are improved significantly. The helicity amplitudes of the main resonances, ∆(1232)P 33 , N(1535)S 11 , N(1520)D 13 , N(1720)P 13 , N(1650)S 11 , and ∆(1620)S 31 , are extracted and compared with the results from other groups.

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Section: Introductionmentioning

confidence: 99%

Neutral pion photoproduction on the nucleon in a chiral quark model

2015

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“…4 The total cross section of K − p → Λη compared with the data is shown in figure 1. It is found that Λ(1670)S 01 play a dominant role in the reactions.…”

Section: Results and Analysismentioning

confidence: 99%

Understanding the negative parity Λ resonances from the K⁻p → Λη reaction and their strong decays

Xiao¹,

Zhong²

2014

Chiral Symmetry in Hadrons and Nuclei

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“…This reaction provides us a clear place to study the low-lying Λ resonances because only the Λ resonance contribute here due to the isospin selection rule. Thus, when some accurate data on the differential and total cross sections of the K − p → ηΛ reaction were reported by the Crystal Ball Collaboration [6], they were analyzed with various theoretical models at once, e.g., effective Lagrangian model [7,8], chiral quark model [9]. Recently, a comprehensive analysis of the K − p scattering data of total and differential cross sections and recoil polarizations was performed with a dynamical coupled-channel model [10].…”

Section: Introductionmentioning

confidence: 99%

Role of $Λ(1670)$ in the $γp \to K^+ ηΛ$ reaction near threshold

Xiao,

Lü,

Xie

et al. 2015

Preprint

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The role of the Λ(1670) resonance in the γp → K + ηΛ reaction near threshold is studied within an effective Lagrangian approach. We perform a calculation for the total and differential cross section of the γp → K + ηΛ reaction by including the contributions from the Λ(1670) intermediate state decaying into ηΛ dominated by K − and K * − mesons exchanges, the nucleon pole and N * (1535) resonance decaying into K + Λ dominated by exchanges of ω and K − mesons. Besides, the nonresonance process and contact terms to keep the total scattering amplitude gauge invariant are also considered. With our model parameters, the total cross section of this reaction is of the order of 1 nanobarn at photon beam energy Eγ ∼ 2.5 GeV. It is expected that our model predictions could be tested by future experiments.

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Low-energyK−p→Ληreaction and the negative parityΛresonances

Cited by 9 publications

References 88 publications

Neutral pion photoproduction on the nucleon in a chiral quark model

Neutral pion photoproduction on the nucleon in a chiral quark model

Understanding the negative parity Λ resonances from the K⁻p → Λη reaction and their strong decays

Role of $Λ(1670)$ in the $γp \to K^+ ηΛ$ reaction near threshold

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Low-energyK−p→Ληreaction and the negative parityΛresonances

Cited by 9 publications

References 88 publications

Neutral pion photoproduction on the nucleon in a chiral quark model

Neutral pion photoproduction on the nucleon in a chiral quark model

Understanding the negative parity Λ resonances from the K−p → Λη reaction and their strong decays

Role of $Λ(1670)$ in the $γp \to K^+ ηΛ$ reaction near threshold

Contact Info

Product

Resources

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Understanding the negative parity Λ resonances from the K⁻p → Λη reaction and their strong decays