Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

CLAS Collaboration

doi:10.1016/j.physletb.2022.136985

Beam-spin asymmetry Σ for Σ⁻ hyperon photoproduction off the neutron

CLAS Collaboration

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

6 Scopus citations

Abstract

We report a new measurement of the beam-spin asymmetry, Σ, for the γ→n→K⁺Σ⁻ reaction using quasi-free neutrons in a liquid-deuterium target. The new dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing new constraints on partial wave analyses used to extract properties of the excited nucleon states. The experimental data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS), housed in Hall B of the Thomas Jefferson National Accelerator Facility (JLab). The CLAS detector measured reaction products from a liquid-deuterium target produced by an energy-tagged, linearly polarised photon beam with energies in the range 1.1 to 2.3 GeV. Predictions from an isobar model indicate strong sensitivity to N(1720)3/2⁺, Δ(1900)1/2⁻, and N(1895)1/2⁻, which corroborates results from a recent combined analysis of all KΣ channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in γ-n couplings of resonances which have small branching ratios to the πN channel.

Original language	English (US)
Article number	136985
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	827
DOIs	https://doi.org/10.1016/j.physletb.2022.136985
State	Published - Apr 10 2022

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2022.136985

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@article{0a7634d1774242fda55226da5c930f94,

title = "Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron",

abstract = "We report a new measurement of the beam-spin asymmetry, Σ, for the γ→n→K+Σ− reaction using quasi-free neutrons in a liquid-deuterium target. The new dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing new constraints on partial wave analyses used to extract properties of the excited nucleon states. The experimental data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS), housed in Hall B of the Thomas Jefferson National Accelerator Facility (JLab). The CLAS detector measured reaction products from a liquid-deuterium target produced by an energy-tagged, linearly polarised photon beam with energies in the range 1.1 to 2.3 GeV. Predictions from an isobar model indicate strong sensitivity to N(1720)3/2+, Δ(1900)1/2−, and N(1895)1/2−, which corroborates results from a recent combined analysis of all KΣ channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in γ-n couplings of resonances which have small branching ratios to the πN channel.",

author = "{CLAS Collaboration} and N. Zachariou and E. Munevar and Berman, {B. L.} and P. Byd{\v z}ovsk{\'y} and A. Ciepl{\'y} and G. Feldman and Y. Ilieva and P. Nadel-Turonski and D. Skoupil and Sarantsev, {A. V.} and Watts, {D. P.} and Amaryan, {M. J.} and G. Angelini and Armstrong, {W. R.} and H. Atac and H. Avakian and L. Barion and M. Bashkanov and M. Battaglieri and I. Bedlinskiy and F. Benmokhtar and A. Bianconi and L. Biondo and Biselli, {A. S.} and M. Bondi and F. Boss{\`u} and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and D. Bulumulla and Burkert, {V. D.} and Carman, {D. S.} and Carvajal, {J. C.} and A. Celentano and P. Chatagnon and T. Chetry and G. Ciullo and L. Clark and Cole, {P. L.} and M. Contalbrigo and G. Costantini and V. Crede and A. D'Angelo and N. Dashyan and {De Vita}, R. and M. Defurne and A. Deur and S. Diehl and C. Djalali and M. Dugger",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s)",

year = "2022",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2022.136985",

language = "English (US)",

volume = "827",

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

issn = "0370-2693",

publisher = "Elsevier",

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TY - JOUR

T1 - Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

AU - CLAS Collaboration

AU - Zachariou, N.

AU - Munevar, E.

AU - Berman, B. L.

AU - Bydžovský, P.

AU - Cieplý, A.

AU - Feldman, G.

AU - Ilieva, Y.

AU - Nadel-Turonski, P.

AU - Skoupil, D.

AU - Sarantsev, A. V.

AU - Watts, D. P.

AU - Amaryan, M. J.

AU - Angelini, G.

AU - Armstrong, W. R.

AU - Atac, H.

AU - Avakian, H.

AU - Barion, L.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Benmokhtar, F.

AU - Bianconi, A.

AU - Biondo, L.

AU - Biselli, A. S.

AU - Bondi, M.

AU - Bossù, F.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Bulumulla, D.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Carvajal, J. C.

AU - Celentano, A.

AU - Chatagnon, P.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clark, L.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Costantini, G.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Djalali, C.

AU - Dugger, M.

PY - 2022/4/10

Y1 - 2022/4/10

N2 - We report a new measurement of the beam-spin asymmetry, Σ, for the γ→n→K+Σ− reaction using quasi-free neutrons in a liquid-deuterium target. The new dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing new constraints on partial wave analyses used to extract properties of the excited nucleon states. The experimental data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS), housed in Hall B of the Thomas Jefferson National Accelerator Facility (JLab). The CLAS detector measured reaction products from a liquid-deuterium target produced by an energy-tagged, linearly polarised photon beam with energies in the range 1.1 to 2.3 GeV. Predictions from an isobar model indicate strong sensitivity to N(1720)3/2+, Δ(1900)1/2−, and N(1895)1/2−, which corroborates results from a recent combined analysis of all KΣ channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in γ-n couplings of resonances which have small branching ratios to the πN channel.

AB - We report a new measurement of the beam-spin asymmetry, Σ, for the γ→n→K+Σ− reaction using quasi-free neutrons in a liquid-deuterium target. The new dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing new constraints on partial wave analyses used to extract properties of the excited nucleon states. The experimental data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS), housed in Hall B of the Thomas Jefferson National Accelerator Facility (JLab). The CLAS detector measured reaction products from a liquid-deuterium target produced by an energy-tagged, linearly polarised photon beam with energies in the range 1.1 to 2.3 GeV. Predictions from an isobar model indicate strong sensitivity to N(1720)3/2+, Δ(1900)1/2−, and N(1895)1/2−, which corroborates results from a recent combined analysis of all KΣ channels. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in γ-n couplings of resonances which have small branching ratios to the πN channel.

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UR - http://www.scopus.com/inward/citedby.url?scp=85126268370&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2022.136985

DO - 10.1016/j.physletb.2022.136985

M3 - Article

AN - SCOPUS:85126268370

SN - 0370-2693

VL - 827

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 - 136985

ER -

Beam-spin asymmetry Σ for Σ⁻ hyperon photoproduction off the neutron

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