Nucleon and Δ resonances in γp→K+Σ0(1385

Ai-Chao Wang

¹

,

Wenling Wang

²

,

F. Huang

³

Abstract

The photoproduction of γp → K + Σ 0 (1385) is investigated based on an effective Lagrangian approach at the tree-level Born approximation, with the purpose being to understand the reaction mechanisms and the resonance contents and their associated parameters in this reaction. In addition to the t-channel K and K * exchanges, the s-channel nucleon (N ) exchange, the u-channel Λ exchange, and the generalized contact term, the exchanges of a minimum number of N and ∆ resonances in the s channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that the most recent differential cross-section data from the CLAS Collaboration can be well reproduced by including one of the N (1895)1/2 − , ∆(1900)1/2 − , and ∆(1930)5/2 − resonances. The reaction mechanisms of γp → K + Σ 0 (1385) are detailedly discussed, and the predictions of the beam and target asymmetries for this reaction are given. The cross sections of γp → K 0 Σ + (1385) are shown to be able to further constrain the theoretical models and pin down the resonance contents for γp → K + Σ 0 (1385).

Direct discovery of new light states at the FCCee

“…To prevent the neutralino from overclosing the Universe, it must decay through an R-parity violating coupling. The FCCee would be in an excellent position to find this type of decaying neutralino [43].…”

Photoproduction γp→K+Λ(1520) in an effective Lagrangian approach

“…The coupling g Λ * N K * is treated as a free parameter to be determined by a fit to the data. For the s-channel resonance exchanges, the Lagrangians for the electromagnetic interactions read [30,[36][37][38][39]]…”

“…Our current knowledge of most of the N * 's is mainly coming from the production reactions of πN , ηN , KΛ, and KΣ channels. In recent years, the photoproductions of vector mesons, η ′ meson, and KY * (Y = Λ, Σ) have also been extensively investigated both experimentally and theoretically towards getting a better understanding of N * 's [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Analysis of the $γn \to K^+ Σ^-(1385)$ photoproduction

“…In our previous work [13], we have performed a de-tailed investigation of the γp → K + Σ 0 (1385) reaction within an effective Lagrangian approach. 1 We considered the s-channel N contribution, t-channel K and K * exchange, u-channel Λ exchange, and generalized contact term.…”

“…In the present work, we employ the same model as in our earlier work of Ref. [13] that works quite well for the γp → K + Σ 0 (1385) reaction to study the photoproduction reaction γn → K + Σ − (1385). The purpose is to get a unified description of both γp → K + Σ 0 (1385) and γn → K + Σ − (1385) within the same theoretical model.…”