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

The CLAS Collaboration

doi:10.1016/j.physletb.2020.135662

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

The CLAS Collaboration

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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
Article number	135662
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	808
DOIs	https://doi.org/10.1016/j.physletb.2020.135662
State	Published - 10 Sep 2020

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@article{abef08ed512346d68fb0c006e098a31e,

title = "Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron",

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.",

author = "{The CLAS Collaboration} and N. Zachariou and Watts, {D. P.} and J. Fleming and Sarantsev, {A. V.} and Nikonov, {V. A.} and A. D'Angelo and M. Bashkanov and C. Hanretty and T. Kageya and Klein, {F. J.} and M. Lowry and H. Lu and A. Sandorfi and X. Wei and I. Zonta and Adhikari, {K. P.} and S. Adhikari and Amaryan, {M. J.} and G. Angelini and G. Asryan and H. Atac and L. Barion and C. Bass and M. Battaglieri and I. Bedlinskiy and F. Benmokhtar and A. Bianconi and Biselli, {A. S.} and F. Boss{\`u} and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and D. Bulumulla and V. Burkert and Carman, {D. S.} and Carvajal, {J. C.} and A. Celentano and G. Charles and P. Chatagnon and T. Chetry and G. Ciullo and Cole, {P. L.} and M. Contalbrigo and N. Dashyan and {De Vita}, R. and A. Deur and S. Diehl and C. Djalali and R. Dupre and Jo, {H. S.}",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2020.135662",

language = "English",

volume = "808",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron

AU - The CLAS Collaboration

AU - Zachariou, N.

AU - Watts, D. P.

AU - Fleming, J.

AU - Sarantsev, A. V.

AU - Nikonov, V. A.

AU - D'Angelo, A.

AU - Bashkanov, M.

AU - Hanretty, C.

AU - Kageya, T.

AU - Klein, F. J.

AU - Lowry, M.

AU - Lu, H.

AU - Sandorfi, A.

AU - Wei, X.

AU - Zonta, I.

AU - Adhikari, K. P.

AU - Adhikari, S.

AU - Amaryan, M. J.

AU - Angelini, G.

AU - Asryan, G.

AU - Atac, H.

AU - Barion, L.

AU - Bass, C.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Benmokhtar, F.

AU - Bianconi, A.

AU - Biselli, A. S.

AU - Bossù, F.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Bulumulla, D.

AU - Burkert, V.

AU - Carman, D. S.

AU - Carvajal, J. C.

AU - Celentano, A.

AU - Charles, G.

AU - Chatagnon, P.

AU - Chetry, T.

AU - Ciullo, G.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Dashyan, N.

AU - De Vita, R.

AU - Deur, A.

AU - Diehl, S.

AU - Djalali, C.

AU - Dupre, R.

AU - Jo, H. S.

PY - 2020/9/10

Y1 - 2020/9/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85088992099&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2020.135662

DO - 10.1016/j.physletb.2020.135662

M3 - Article

AN - SCOPUS:85088992099

SN - 0370-2693

VL - 808

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 135662

ER -

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

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