Spin calculations: πΔ photoproduction

Test of the reaction mechanism forγN→KΛ(1520)using the polarized photon

“…D µν is the spin-3/2 fermion propagator [3,14], for which here we use the usual spin-1/2 fermion propagator, since the difference is negligible in the relatively low energy regions [3]. For the form factor, we employ the gauge invariant one with the four momentum cutoff Λ, which was used for the study of γN → KΛ * in Ref.…”

Spin- $\frac{5}{2}$ resonance contributions to the pion-induced reactions for energies $\sqrt{s} \leq 2.0$ GeV

“…However, it has been shown [19] that these contributions cannot be suppressed for any value of a. Indeed, Read [20] has demonstrated that the choice of the off-shell parameter in the coupling is closely linked to the off-shell behavior of the propagator. To overcome this problem Pascalutsa suggested gauge invariance as an additional constraint to fix the interaction Lagrangians for higher spins and remove the lower-spin components [21].…”

“…The differences between these descriptions have been discussed in [5,23,24] and here we perform calculations by using both 'conventional' (C) and Pascaluta (P ) approaches. Similar to the spin-3 2 case [20], the off-shell parameters a in (3) can be linked to the coupling strengths extracted through (6) In order to take into account the internal structure of mesons and baryons each vertex is dressed by a corresponding formfactor:…”

Contribution of higher nucleon resonances toK*Λphotoproduction

“…where N , Λ, Σ, and Σ * stand for the nucleon, Λ(1116), Σ(1192), and Σ * (1385, 3/2 + ) hyperon fields, respectively, and M h denotes the mass of hadron h. The baryon fields with spin s ≥ 3/2 are described by the Rarita-Schwinger vectorspinor formalism [22,23]. Here, κ B is the anomalous magnetic moment of baryon B and µ ΛΣ is the transition magnetic moment between the Λ(1116) and the Σ(1192).…”