Channel coupling effects in ρ-meson photoproduction

Abstract

We investigate ρ-meson photoproduction in a coupled-channels formulation. It is shown that channel coupling effects are large and account for discrepancies observed in several single-channel treatments.

Analytic extension of the K-matrix formalism

“…Some recent examples of this can be found in Refs. [6,7,8,9]. Also, as a result of the channel coupling, the resonances obtain widths which are consistent with their coupling to all channels included in the model space.…”

“…The kernel in a K-matrix approach is usually taken as the sum of the tree-level diagrams [2,3,5,4,6,7]. One complication one encounters in the ACK model is that at the threshold for the channel with the lightest particles, M 1 , there is a sizable coupling to all heavier channels.…”

P -wave excited baryons from pion- and photo-induced hyperon production

“…The physics at MAMI (among other data) has been closely followed by the MAID group of Drechsel and Tiator [131,132,133,134,135,136,137,138]. Smaller groups at Zagreb [139,140,141,142], Gent [143,144,145,146] and KVI made significant contributions to the field [147,148,149,150,151]. A few further papers are to be mentioned [152,153,154,155,156].…”

Bayesian Inference of the Resonance Content ofp(γ,K+)Λ

“…In this Letter, we wish to address this issue in a statistically solid way, using Bayesian inference. The past decade has seen the development of advanced coupled-channels (CC) models [4,5,7,12,13]. The effect of channel openings has been identified as playing an important role in the reaction dynamics [14].…”

“…Gent-Isobar [6] Giessen [7] KaonMAID [8] RPR-2007 [9] Saclay-Lyon [10] SAID [11] US/SSL [12,13] The criterion to determine whether a resonance contributes significantly or insignificantly varies among different analyses. In this Letter, we wish to address this issue in a statistically solid way, using Bayesian inference.…”