Title

Beam-spin asymmetry Σ for Σ hyperon photoproduction off the neutron

DOI

10.1016/j.physletb.2022.136985

Authors

N. Zachariou, University of York
E. Munevar, Universidad Distrital Francisco Jose de Caldas
B. L. Berman, The George Washington University
P. Bydžovský, Nuclear Physics Institute of the Academy of Sciences of the Czech Republic v. v. i.
A. Cieplý, Nuclear Physics Institute of the Academy of Sciences of the Czech Republic v. v. i.
G. Feldman, The George Washington University
Y. Ilieva, University of South Carolina
P. Nadel-Turonski, Catholic University of America
D. Skoupil, Nuclear Physics Institute of the Academy of Sciences of the Czech Republic v. v. i.
A. V. Sarantsev, Universität Bonn
D. P. Watts, University of York
M. J. Amaryan, Old Dominion University
G. Angelini, The George Washington University
W. R. Armstrong, Argonne National Laboratory
H. Atac, Temple University
H. Avakian, Thomas Jefferson National Accelerator Facility
L. Barion, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
M. Bashkanov, University of York
M. Battaglieri, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
I. Bedlinskiy, National Research Centre "Kurchatov Institute"
F. Benmokhtar, Duquesne University
A. Bianconi, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
L. Biondo, Istituto Nazionale di Fisica Nucleare, Sezione di Catania
A. S. Biselli, Fairfield University
M. Bondi, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
F. Bossù, Universite Paris-Saclay
S. Boiarinov, Thomas Jefferson National Accelerator Facility
W. J. Briscoe, The George Washington University
W. K. Brooks, Thomas Jefferson National Accelerator Facility
D. Bulumulla, Old Dominion University
V. D. Burkert, Thomas Jefferson National Accelerator Facility

Document Type

Journal Article

Publication Date

4-10-2022

Publication Title

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

827

ISSN

3702693

Abstract

We report a new measurement of the beam-spin asymmetry, Σ, for the γ→n→K+Σ− reaction using quasi-free neutrons in a liquid-deuterium target. The new dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing new constraints on partial wave analyses used to extract properties of the excited nucleon states. The experimental data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS), housed in Hall B of the Thomas Jefferson National Accelerator Facility (JLab). The CLAS detector measured reaction products from a liquid-deuterium target produced by an energy-tagged, linearly polarised photon beam with energies in the range 1.1 to 2.3 GeV. Predictions from an isobar model indicate strong sensitivity to N(1720)3/2+, Δ(1900)1/2−, and N(1895)1/2−, which corroborates results from a recent combined analysis of all KΣ channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in γ-n couplings of resonances which have small branching ratios to the πN channel.

Open Access

Gold

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