Beam-spin asymmetry Σ for Σ.sup.–./sup. hyperon photoproduction off the neutron

0559793 - ÚJF 2023 RIV NL eng J - Journal Article
Zachariou, N. - Munevar, E. - Berman, B. L. - Bydžovský, Petr - Cieplý, Aleš - Feldman, G. J. - Ilieva, Y. - Nadel-Turonski, P. - Skoupil, Dalibor … Total 150 authors
Beam-spin asymmetry Σ for Σ^– hyperon photoproduction off the neutron.
Physics Letters. B. Roč. 827, APR (2022), č. článku 136985. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR GA19-19640S
Institutional support: RVO:61389005
Keywords : beam-spin asymmetry * liquid-deuterium target * CLAS detector
OECD category: Particles and field physics
Impact factor: 4.3, year: 2022
Method of publishing: Open access
https://doi.org/10.1016/j.physletb.2022.136985

We report a new measurement of the beam-spin asymmetry, Sigma, for the (gamma) over right arrown -> K+Sigma(-) 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(+), Delta(1900)1/2(-), and N(1895)1/2(-), which corroborates results from a recent combined analysis of all K Sigma channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in gamma-n couplings of resonances which have small branching ratios to the pi N channel.
Permanent Link: https://hdl.handle.net/11104/0332992