Gauge-invariant approach to meson photoproduction including the final-state interaction

Haberzettl, H.; Nakayama, K.; Krewald, S.

doi:10.1103/physrevc.74.045202

Cited by 81 publications

(173 citation statements)

References 62 publications

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“…For scattering amplitudes similar formalisms were discussed in Refs. [16,17,18]. The relevant equations in the two limiting cases A and B introduced above will appear as special cases of these general equations.…”

Section: Bethe-salpeter Approachmentioning

confidence: 99%

Two-photon decays of hadronic molecules

Hanhart

Kalashnikova²,

Kudryavtsev³

et al. 2007

Phys. Rev. D

118

139

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In many calculations of the two-photon decay of hadronic molecules, the decay matrix element is estimated using the wave function at the origin prescription, in analogy to the two-photon decay of parapositronium. We question the applicability of this procedure to the two-photon decay of hadronic molecules for it introduces an uncontrolled model dependence into the calculation. As an alternative approach, we propose an explicit evaluation of the hadron loop. For shallow bound states, this can be done as an expansion in powers of the range of the molecule binding force 1/β. In the leading order one gets the well-known pointlike limit answer. We estimate, in a self-consistent and gauge invariant way, the leading range corrections for the two-photon decay width of weakly bound hadronic molecules emerging from kaon loops. We find them to be small, of order O(mε/β 2 ), where m and ε denote the mass of the constituents and the binding energy, respectively. The role of possible shortranged operators and of the width of the scalars remains to be investigated.

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Section: Bethe-salpeter Approachmentioning

confidence: 99%

Two-photon decays of hadronic molecules

Hanhart

Kalashnikova²,

Kudryavtsev³

et al. 2007

Phys. Rev. D

118

139

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“…For details on the restoration of gauge invariance and a more general form of C µ , we refer the readers to Ref. [28].…”

Section: Generalized Contact Currentmentioning

confidence: 99%

“…Following the prescription of Ref. [28], we restore gauge invariance by introducing the following generalized contact term to the amplitude for the reaction γp → K + 0 (1385):…”

Section: Generalized Contact Currentmentioning

confidence: 99%

Nucleon and Δ resonances inKΣ(1385)photoproduction from nucleons

Nakayama

2008

Phys. Rev. C

Self Cite

167

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“…Thus, following the prescription described in Refs. [28][29][30], we write the reaction amplitudes as…”

Section: Formalismmentioning

confidence: 99%

Contribution of higher nucleon resonances toK*Λphotoproduction

Kim

Nam

et al. 2011

Phys. Rev. D

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We investigate K * Λ(1116) photoproduction off the proton and neutron targets in the effective Lagrangian method in the tree-level Born approximation. In addition to the K, K * , and κ exchanges which are the main contributions to the reaction, we consider the contributions from the higher nucleon resonances D13(2080) and the D15(2200). We find that the D13(2080) plays a crucial role in explaining the enhancement of the near-threshold production rate, which results in a good agreement with the experimental data for the proton targets, while the contribution of the D15(2200) is rather small. A similar conclusion is drawn for K * photoproduction off the neutron targets. In addition to the energy and angular dependence of the cross sections, we present the predictions on the photon-beam asymmetry.

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Gauge-invariant approach to meson photoproduction including the final-state interaction

Cited by 81 publications

References 62 publications

Two-photon decays of hadronic molecules

Two-photon decays of hadronic molecules

Nucleon and Δ resonances inKΣ(1385)photoproduction from nucleons

Contribution of higher nucleon resonances toK*Λphotoproduction

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