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

University of York
University of Edinburgh
University of Bonn
Russian Research Centre Kurchatov Institute
National Institute for Nuclear Physics
University of Rome Tor Vergata
Thomas Jefferson National Accelerator Facility
University of Virginia
Catholic University of America
University of Iowa
Old Dominion University
Florida International University
George Washington University
A. Alikhanian Yerevan Institute of Physics
Temple University
Duquesne University
University of Brescia
Fairfield University
Université Paris-Saclay
Universidad Técnica Federico Santa Maria
Mississippi State University
University of Ferrara
Idaho State University
University of Connecticut
Ohio University
University of South Carolina
Argonne National Laboratory

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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

Access to Document

10.1016/j.physletb.2020.135662

Cite this

@article{abef08ed512346d68fb0c006e098a31e,

title = "Beam{\textendash}target helicity asymmetry E in K+Σ− photoproduction on the neutron",

abstract = "We report a measurement of a beam{\textendash}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 {\textquotedblleft}missing{\textquotedblright} 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 - https://www.scopus.com/pages/publications/85088992099

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this