Photoproduction of the <math><msup><mi mathvariant="normal">Σ</mi><mo>+</mo></msup></math> hyperon using linearly polarized photons with CLAS

Clark, L.; McKinnon, B.; Ireland, D.G.; Glazier, D.I.; Livingston, K.; Rönchen, D.; Acar, A.G.; Achenbach, P.; Alvarado, J.S.; Amaryan, M.J.

doi:10.1103/PhysRevC.111.025204

Photoproduction of the $Σ^{+}$ hyperon using linearly polarized photons with CLAS

CLAS

Collaboration

•

L. Clark
(
- Glasgow U.
)

Apr 30, 2024

10 pages

Published in:

Phys.Rev.C 111 (2025) 2, 025204

Published: Feb 20, 2025

e-Print:

2404.19404 [nucl-ex]

DOI:

10.1103/PhysRevC.111.025204 (publication)

View in:

pdf

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Abstract: (APS)

Background: Measurements of the polarization observables

Σ, P, T, O_{x}, O_{z}

for the reaction

\vec{γ} p \to K_{S}^{0} Σ^{+}

using a linearly polarized photon beam of energy 1.1 to 2.1 GeV are reported. Purpose: The measured data provide information on a channel that has not been studied extensively, but is required for a full coupled-channel analysis in the nucleon resonance region. Method: Observables have been simultaneously extracted using likelihood sampling with a Markov-Chain Monte Carlo process. Results: Angular distributions in bins of photon energy

E_{γ}

are produced for each polarization observable.

T, O_{x}

, and

O_{z}

are first time measurements of these observables in this reaction. The extraction of

Σ

extends the energy range beyond a previous measurement. The measurement of

P

, the recoil polarization, is consistent with previous measurements. Conclusions: The measured data are shown to be significant enough to affect the estimation of the nucleon resonance parameters when fitted within a coupled-channels model.

Note:

10 pages, 5 figures

beam: energy
photon: beam
Sigma+: photoproduction
photon: energy
model: coupled channel
polarization: recoil
nucleon resonance
angular distribution
GeV
background

References(30)

Figures(8)

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