Nucleon and <math display="inline"><mi mathvariant="normal">Δ</mi></math> resonances in <math display="inline"><mi>γ</mi><mi>n</mi><mo stretchy="false">→</mo><msup><mi>K</mi><mo>+</mo></msup><msup><mi mathvariant="normal">Σ</mi><mo>-</mo></msup></math> photoproduction

Wei, Neng-Chang; Wang, Ai-Chao; Huang, Fei; Nakayama, Kanzo

doi:10.1103/PhysRevD.105.094017

Nucleon and $Δ$ resonances in $γ n \to K^{+} Σ^{-}$ photoproduction

Apr 29, 2022

11 pages

Published in:

Phys.Rev.D 105 (2022) 9, 094017

Published: May 1, 2022

e-Print:

2204.13922 [hep-ph]

DOI:

10.1103/PhysRevD.105.094017 (publication)

View in:

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Abstract: (APS)

The most recent data on beam asymmetries

Σ

and beam-target asymmetries

E

from the CLAS Collaboration, together with the previous data on differential cross sections and beam asymmetries from the CLAS and LEPS Collaborations, for the

γ n \to K^{+} Σ^{-}

reaction are studied based on an effective Lagrangian approach in the tree-level Born approximation. The

t

-channel

K

and

K^{*} (892)

exchanges, the

u

-channel

Σ

exchange, the interaction current, and the exchanges of

N

,

Δ

, and their excited states in the

s

channel are considered in constructing the reaction amplitudes to describe the available experimental data. The reaction mechanisms of

γ n \to K^{+} Σ^{-}

are analyzed, and the associated resonances’ parameters are extracted. The numerical results show that the

Δ

exchange and the

N (1710) 1 / 2^{+}

,

N (1880) 1 / 2^{+}

,

N (1900) 3 / 2^{+}

, and

Δ (1920) 3 / 2^{+}

resonance exchanges in the

s

channel dominate the

γ n \to K^{+} Σ^{-}

reaction in the lower energy region, and the

t

-channel

K^{*} (892)

exchange plays a crucial role at forward angles in the higher energy region.

Note:

To be published in Physical Review D; 11 pages, 5 figures

25.20.Lj
13.60.Le
14.20.Gk
13.75.Jz
nucleon
photoproduction
beam: asymmetry
excited state
effective Lagrangian
N(1710)

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Nucleon and Δ resonances in γn→K+Σ- photoproduction

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Nucleon and $Δ$ resonances in $γ n \to K^{+} Σ^{-}$ photoproduction