Electromagnetic interactions of weakly-bound composite systems

Close, F. E.; Copley, L. A.

doi:10.1016/0550-3213(70)90362-7

Cited by 86 publications

(13 citation statements)

References 20 publications

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“…(35) in the calculations. Including the effects of the binding potential between quarks [49], for emitting a photon the nonrelativistic expansion of H e may be written as [42,43,50]…”

Section: Radiative Decaymentioning

confidence: 99%

Ω baryon spectrum and their decays in a constituent quark model

et al. 2020

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Combining the recent developments of the observations of Ω sates we calculate the Ω spectrum up to the N = 2 shell within a nonrelativistic constituent quark potential model. Furthermore, the strong and radiative decay properties for the Ω resonances within the N = 2 shell are evaluated by using the masses and wave functions obtained from the potential model. It is found that the newly observed Ω(2012) resonance is most likely to be the spin-parity J P = 3/2 − 1P-wave state Ω(1 2 P 3/2 − ), it also has a large potential to be observed in the Ω(1672)γ channel. Our calculation shows that the 1P-, 1D-, and 2S -wave Ω baryons have a relatively narrow decay width of less than 50 MeV. Based on the obtained decay properties and mass spectrum, we further suggest optimum channels and mass regions to find the missing Ω resonances via the strong and/or radiative decay processes.

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“…(35) in the calculations. Including the effects of the binding potential between quarks [49], for emitting a photon the nonrelativistic expansion of H e may be written as [42,43,50]…”

Section: Radiative Decaymentioning

confidence: 99%

Ω baryon spectrum and their decays in a constituent quark model

et al. 2020

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“…( 8) in the calculations. Including the effects of binding potential between quarks [56], the nonrelativistic expansion of H e may be written as [57][58][59]…”

Section: A the Modelmentioning

confidence: 99%

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

et al. 2017

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The charmonium spectrum is calculated with two nonrelativistic quark models, the linear potential model and the screened potential model. Using the obtained wavefunctions, we evaluate the electromagnetic transitions of charmonium states up to 4S multiplet. The higher multipole contributions are included by a multipole expansion of the electromagnetic interactions. Our results are in reasonable agreement with the measurements. As conventional charmonium states, the radiative decay properties of the newly observed charmonium-like states, such as X(3823), X(3872), X(4140/4274), are discussed. The X(3823) as ψ 2 (1D), its radiative decay properties well agree with the observations. From the radiative decay properties of X(3872), one can not exclude it as a χ c1 (2P) dominant state. We also give discussions of possibly observing the missing charmonium states in radiative transitions, which might provide some useful references to look for them in forthcoming experiments. The higher multipole contributions to the electromagnetic transitions are analyzed as well. It is found that the higher contribution from the magnetic part could give notable corrections to some E1 dominant processes by interfering with the E1 amplitudes. Our predictions for the normalized magnetic quadrupole amplitudes M 2 of the χ c1,2 (1P) → J/ψγ processes are in good agreement with the recent CLEO measurements.

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“…The calculation of the direct and crossed resonance pole diagrams follows the similar procedure in Compton Scattering (γN → γN) [11] in the low energy limit. Rewritting the electromagnetic interaction H e as…”

Section: The Let For a Three Quark Systemmentioning

confidence: 99%

Threshold pion photoproduction of nucleons in the chiral quark model

1994

Phys. Rev. D

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In this paper, we show that the low energy theorem (LET) of the threshold pion-photoproduction can be fully recovered in the quark model. An essential result of this investigation is that the quark-pion operators are obtained from the effective chiral Lagrangian, and the low energy theorem does not require the constraints on the internal structures of the nucleon. The pseudoscalar quark-pion coupling generates an additional term at order µ = m π /M only in the isospin amplitude A (−) . The role of the transitions between the nucleon and the resonance P 33 (1232) and P-wave baryons are also discussed, we find that the leading contributions to the isospin amplitudes at O(µ 2 ) are from the transition between the P-wave baryons and the nucleon and the charge radius of the nucleon. The leading contribution from the Pwave baryons only affects the neutral pion production, and improve the agreement with data significantly. The transition between the resonance P 33 (1232) and the nucleon only gives an order µ 3 corrections to A (−) .

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Electromagnetic interactions of weakly-bound composite systems

Cited by 86 publications

References 20 publications

Ω baryon spectrum and their decays in a constituent quark model

Ω baryon spectrum and their decays in a constituent quark model

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

Threshold pion photoproduction of nucleons in the chiral quark model

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