Study of the ηN scattering amplitude through the associated photoproduction of ϕ- and η-mesons in the region of the N∗(1535) resonance

Lutz, Matthias; Soyeur, Madeleine

doi:10.1016/j.nuclphysa.2006.05.003

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…This is a choice based on dynamical considerations outlined in Ref. 4 in the absence of direct constraints from data. There is an obvious uncertainty linked to that assumption.…”

Section: Introduction: the ηN Scattering Amplitude And Scattering Lengthmentioning

confidence: 99%

STUDY OF THE THRESHOLD BEHAVIOR OF THE ηN SCATTERING AMPLITUDE THROUGH THE ASSOCIATED PHOTOPRODUCTION OF ϕ- AND η-MESONS

Soyeur

Lutz

2007

Int. J. Mod. Phys. A

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We suggest that the γp → φηp reaction cross section, in the kinematics where the ηp invariant mass in the final state lies between the threshold value (mp+mη) and the N*(1535) resonance mass, is largely determined by the ηN scattering amplitude close to threshold. The initial photon energy is chosen in the range 4 < E Lab γ < 5 GeV, in order to reach low (absolute) values of the squared 4-momentum transfer from the initial photon to the final φ-meson. In these conditions, we expect the t-channel π 0 -and η-meson exchanges to drive the dynamics underlying the γp → φηp process. We show that the η-exchange is the dominating contribution to the cross section while the π 0 -exchange is negligible. The η-π 0 interference is of the order of 20 − 30%. The sign of this term is not known and alters significantly our results. Data on the γp → φηp process would be therefore very useful to help unravelling the behavior of the ηp scattering amplitude close to threshold and assessing the possibility of producing η-nucleus bound states.

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“…This is a choice based on dynamical considerations outlined in Ref. 4 in the absence of direct constraints from data. There is an obvious uncertainty linked to that assumption.…”

Section: Introduction: the ηN Scattering Amplitude And Scattering Lengthmentioning

confidence: 99%

STUDY OF THE THRESHOLD BEHAVIOR OF THE ηN SCATTERING AMPLITUDE THROUGH THE ASSOCIATED PHOTOPRODUCTION OF ϕ- AND η-MESONS

Soyeur

Lutz

2007

Int. J. Mod. Phys. A

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Pion photoproduction off the proton in a gauge-invariant chiral unitary framework

2012

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We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction π − p → ηn. To assess the theoretical uncertainty, we perform two different fit strategies. Having determined the low-energy constants, we then analyse the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new lowenergy constants are determined by the neutron and proton magnetic moments.

show abstract

Study of the ηN scattering amplitude through the associated photoproduction of ϕ- and η-mesons in the region of the N∗(1535) resonance

Cited by 2 publications

References 14 publications

STUDY OF THE THRESHOLD BEHAVIOR OF THE ηN SCATTERING AMPLITUDE THROUGH THE ASSOCIATED PHOTOPRODUCTION OF ϕ- AND η-MESONS

STUDY OF THE THRESHOLD BEHAVIOR OF THE ηN SCATTERING AMPLITUDE THROUGH THE ASSOCIATED PHOTOPRODUCTION OF ϕ- AND η-MESONS

Pion photoproduction off the proton in a gauge-invariant chiral unitary framework

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