Beam–target helicity asymmetry E in K<sup>+</sup>Σ<sup>−</sup> photoproduction on the neutron
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Date Issued
2020-09-10
Author(s)
Zachariou, N.
Watts, D. P.
Fleming, J.
Sarantsev, A. V.
Nikonov, V. A.
D'Angelo, A.
Bashkanov, M.
Hanretty, C.
Kageya, T.
Klein, F. J.
Lowry, M.
Lu, H.
Sandorfi, A.
Wei, X.
Zonta, I.
Adhikari, K. P.
Adhikari, S.
Amaryan, M. J.
Angelini, G.
Asryan, G.
Atac, H.
Barion, L.
Bass, C.
Battaglieri, M.
Bedlinskiy, I.
Benmokhtar, F.
Bianconi, A.
Biselli, A. S.
Bossù, F.
Boiarinov, S.
Briscoe, W. J.
Bulumulla, D.
Burkert, V.
Carman, D. S.
Carvajal, J. C.
Celentano, A.
Charles, G.
Chatagnon, P.
Chetry, T.
Ciullo, G.
Cole, P. L.
Contalbrigo, M.
Dashyan, N.
De Vita, R.
Deur, A.
Diehl, S.
Djalali, C.
Dupre, R.
Egiyan, H.
Ehrhart, M.
Eugenio, P.
Fegan, S.
Fersch, R.
Filippi, A.
Gavalian, G.
Gevorgyan, N.
Ghandilyan, Y.
Gilfoyle, G. P.
Girod, F. X.
Gohn, W.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guidal, M.
Hafidi, K.
Hattawy, M.
Heddle, D.
Hicks, K.
Ho, D.
Holtrop, M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jenkins, D.
Jo, H. S.
Joo, K.
Joosten, S. J.
Keller, D.
Khachatryan, M.
Khanal, A.
Khandaker, M.
Kim, C. W.
Kim, W.
Kubarovsky, V.
Lanza, L.
Leali, M.
Lenisa, P.
Livingston, K.
MacGregor, I. J.D.
Marchand, D.
Markov, N.
Marsicano, L.
Mascagna, V.
Mayer, M.
Soto, O.
DOI
10.1016/j.physletb.2020.135662
Abstract
We report a measurement of a beam–target double-polarisation observable (E) for the γn(p) →
K +−(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.
K +−(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.
Subjects
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