Egiyan, H, Ehrhart, M, El Alaoui, A et al. (90 more authors) (2020) Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 135662. ISSN 0370-2693
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2020 Published by Elsevier B.V. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Funding Information: | Funder Grant number SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC) ST/V001035/1 SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC) ST/P004385/2 |
Depositing User: | Pure (York) |
Date Deposited: | 11 Sep 2020 08:00 |
Last Modified: | 16 Oct 2024 16:56 |
Published Version: | https://doi.org/10.1016/j.physletb.2020.135662 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.physletb.2020.135662 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:165428 |
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