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Beam–target helicity asymmetry E in K+Σ photoproduction on the neutron

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  • The CLAS Collaboration


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JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
DateAccepted/In press - 26 Jul 2020
DatePublished (current) - 10 Sep 2020
Number of pages7
Original languageEnglish


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.

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©2020 Published by Elsevier B.V.

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