Beam-spin asymmetry $Σ$ for $Σ^-$ hyperon photoproduction off the neutron

Nicholas Zachariou; Edwin Munevar; Barry Berman; Petr Bydzovsky; Ales Cieply; Gerald Feldman; Yordanka Ilieva; Pawel Nadel-Turonski; Dalipor Skoupil; Andrey Sarantsev; Dan Watts; Mikhail Bashkanov; Stuart Fegan

doi:10.1016/j.physletb.2022.136985

Beam-spin asymmetry $Σ$ for $Σ^-$ hyperon photoproduction off the neutron

Nicholas Zachariou, Edwin Munevar, Barry Berman, Petr Bydzovsky, Ales Cieply, Gerald Feldman, Yordanka Ilieva, Pawel Nadel-Turonski, Dalipor Skoupil, Andrey Sarantsev, Dan Watts, Mikhail Bashkanov, Stuart Fegan

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

Abstract

We report a new measurement of the beam-spin asymmetry $\boldsymbol{\Sigma}$ for the $\vec{\gamma} n \rightarrow K^+\Sigma^-$ 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 $N(1720)3/2^+$, $\Delta(1900)1/2^-$, and $N(1895)1/2^-$, with the latter being a state not considered in previous photoproduction analyses. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in $\gamma$-$n$ couplings of the resonances which have small branching ratios to the $\pi N$ channel.

Original language	English
Article number	136985
Number of pages	8
Journal	Physics Letters B
Volume	827
Early online date	14 Mar 2022
DOIs	https://doi.org/10.1016/j.physletb.2022.136985
Publication status	Published - 10 Apr 2022

Bibliographical note

Keywords

nucl-ex
hep-ex

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10.1016/j.physletb.2022.136985Licence: CC BY

Beam-spin asymmetry for − hyperon photoproduction off the neutron
© 2022 The Author(s).
Final published version, 1.39 MBLicence: CC BY
2106.13957v2

https://arxiv.org/abs/2106.13957

1 Finished
1 Active

Nuclear Physics Consolidated Grant 2021-2024
Jenkins, D. (Principal investigator), Andreyev, A. (Co-investigator), Bashkanov, M. (Co-investigator), Bentley, M. (Co-investigator), Dobaczewski, J. J. (Co-investigator), Laird, A. M. (Co-investigator), Paschalis, S. (Co-investigator), Pastore, A. (Co-investigator), Petri, M. (Co-investigator), Wadsworth, R. (Co-investigator), Watts, D. (Co-investigator) & Zachariou, N. (Co-investigator)
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/10/21 → 31/03/25
Project: Research project (funded) › Research
Shining a light on strangeness
Zachariou, N. (Principal investigator)
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/09/18 → 31/12/22
Project: Research project (funded) › Research

Cite this

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

abstract = " We report a new measurement of the beam-spin asymmetry $\boldsymbol{\Sigma}$ for the $\vec{\gamma} n \rightarrow K^+\Sigma^-$ 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 $N(1720)3/2^+$, $\Delta(1900)1/2^-$, and $N(1895)1/2^-$, with the latter being a state not considered in previous photoproduction analyses. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in $\gamma$-$n$ couplings of the resonances which have small branching ratios to the $\pi N$ channel. ",

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author = "Nicholas Zachariou and Edwin Munevar and Barry Berman and Petr Bydzovsky and Ales Cieply and Gerald Feldman and Yordanka Ilieva and Pawel Nadel-Turonski and Dalipor Skoupil and Andrey Sarantsev and Dan Watts and Mikhail Bashkanov and Stuart Fegan",

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

AU - Zachariou, Nicholas

AU - Munevar, Edwin

AU - Berman, Barry

AU - Bydzovsky, Petr

AU - Cieply, Ales

AU - Feldman, Gerald

AU - Ilieva, Yordanka

AU - Nadel-Turonski, Pawel

AU - Skoupil, Dalipor

AU - Sarantsev, Andrey

AU - Watts, Dan

AU - Bashkanov, Mikhail

AU - Fegan, Stuart

PY - 2022/4/10

Y1 - 2022/4/10

N2 - We report a new measurement of the beam-spin asymmetry $\boldsymbol{\Sigma}$ for the $\vec{\gamma} n \rightarrow K^+\Sigma^-$ 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 $N(1720)3/2^+$, $\Delta(1900)1/2^-$, and $N(1895)1/2^-$, with the latter being a state not considered in previous photoproduction analyses. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in $\gamma$-$n$ couplings of the resonances which have small branching ratios to the $\pi N$ channel.

AB - We report a new measurement of the beam-spin asymmetry $\boldsymbol{\Sigma}$ for the $\vec{\gamma} n \rightarrow K^+\Sigma^-$ 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 $N(1720)3/2^+$, $\Delta(1900)1/2^-$, and $N(1895)1/2^-$, with the latter being a state not considered in previous photoproduction analyses. When our data are incorporated in the fits of partial-wave analyses, one observes significant changes in $\gamma$-$n$ couplings of the resonances which have small branching ratios to the $\pi N$ channel.

KW - nucl-ex

KW - hep-ex

U2 - 10.1016/j.physletb.2022.136985

DO - 10.1016/j.physletb.2022.136985

M3 - Article

SN - 0370-2693

VL - 827

JO - Physics Letters B

JF - Physics Letters B

M1 - 136985

ER -

Beam-spin asymmetry $Σ$ for $Σ^-$ hyperon photoproduction off the neutron

Abstract

Bibliographical note

Keywords

Access to Document

Projects

Nuclear Physics Consolidated Grant 2021-2024

Shining a light on strangeness

Cite this