How well do we know the<i>E</i>2/<i>M</i>1 ratio for the Δ(1232)?

Workman, R. L.; Arndt, Richard A.; Li, Zhujun

doi:10.1103/physrevc.46.1546

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…In both models, N(940) is dominated by the three-quark state in the lowest energy. This is also the case for ∆(1232), and the d-wave excitation of quarks is hardly found in this state [26,27,28]. We note that N(940) and ∆(1232) in the CPA model have the three-quark component with (j q , t q ) = (3/2, 3/2) and (j q , t q ) = (1/2, 1/2), respectively.…”

Section: B Mixings Coefficientsmentioning

confidence: 92%

Coherent pair state of the pion in the constituent quark model

Morishita¹,

Masaki²

2002

Phys. Rev. C

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A coherent state of pions is introduced to the nonrelativistic quark model. The coherent pair approximation is employed for the pion field in order to maintain the spin-isospin symmetry. In this approximation the pion is localized in the momentum space, and the vertex form factor in the pion-quark interaction is derived from this localization. The nucleon masses and wave functions are calculated using this model, and our results are compared to those of the quark model with the one pion exchange potential. Similar result is obtained for the mass spectrum, but there exists a clear difference in the internal structure of nucleon resonances.

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Section: B Mixings Coefficientsmentioning

confidence: 92%

Coherent pair state of the pion in the constituent quark model

Morishita¹,

Masaki²

2002

Phys. Rev. C

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“…1+ at the resonance energy. Both the RPI [5] and VPI [7] groups have found ratios near −1.5% in the past. However, while the PDG [8] quotes these values, a number of recent determinations have found larger negative values.…”

Section: The E2/m1 Ratiomentioning

confidence: 99%

Pion photoproduction in the Δ resonance region

1997

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We have updated our multipole analyses to incorporate new data from the low-energy and ⌬ resonance regions. We note a slight decrease in our estimate of the ⌬ photodecay amplitudes. This agrees with results found in Compton scattering. Our values are also in good agreement with another previous determination. We have reexamined our determinations of the E2/M 1 ratio at the resonance energy and at the pole. We find an E2/M 1 ratio ͑at the pole͒ which is in good agreement with the recent Mainz value. ͓S0556-2813͑97͒06107-4͔

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“…By weighting data, we magnify changes in the multipole amplitudes, and more clearly see where data conflicts occur. In the case of the E2/M1 ratio, for example, an early forced fit [9] to Σ data resulted in a value of −2.9%, when the predominant value was −1.5%.…”

mentioning

confidence: 99%