Projects per year
Abstract
We report a measurement of a beam–target double-polarisation observable (E) for the γ→n→(p)→K+Σ−(p) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall B at Jefferson Lab on a longitudinally-polarised frozen-spin hydrogen deuteride (HD) nuclear target. The E observable for an effective neutron target was determined for centre-of-mass energies 1.70≤W≤2.30 GeV, with reaction products detected over a wide angular acceptance by the CLAS spectrometer. These new double-polarisation data give unique constraints on the strange decays of excited neutron states. Inclusion of the new data within the Bonn-Gatchina theoretical model results in significant changes for the extracted photocouplings of a number of established nucleon resonances. Possible improvements in the PWA description of the experimental data with additional “missing” resonance states, including the N(2120)3/2− resonance, are also quantified.
Original language | English |
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Article number | 135662 |
Number of pages | 7 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 808 |
Early online date | 30 Jul 2020 |
DOIs | |
Publication status | Published - 10 Sep 2020 |
Bibliographical note
©2020 Published by Elsevier B.V.Profiles
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Nuclear Physics Consolidated Grant 2021-2024
Jenkins, D., Andreyev, A., Bashkanov, M., Bentley, M., Dobaczewski, J. J., Laird, A. M., Paschalis, S., Pastore, A., Petri, M., Wadsworth, R., Watts, D. & Zachariou, N.
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/10/21 → 30/09/24
Project: Research project (funded) › Research
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Shining a light on strangeness
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/09/18 → 31/12/22
Project: Research project (funded) › Research