Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory

The CLAS Collaboration

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The photoproduction of ω mesons off the proton has been studied in the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω→π+π-π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.

Original languageEnglish (US)
Article number055202
JournalPhysical Review C
Volume97
Issue number5
DOIs
StatePublished - May 4 2018

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photoproduction
acceptability
mesons
asymmetry
spectrometers
protons
photon beams
accelerators
thresholds
decay
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory. / The CLAS Collaboration.

In: Physical Review C, Vol. 97, No. 5, 055202, 04.05.2018.

Research output: Contribution to journalArticle

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abstract = "The photoproduction of ω mesons off the proton has been studied in the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω→π+π-π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40{\%} in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.",
author = "{The CLAS Collaboration} and P. Roy and Z. Akbar and S. Park and V. Crede and Anisovich, {A. V.} and I. Denisenko and E. Klempt and Nikonov, {V. A.} and Sarantsev, {A. V.} and Adhikari, {K. P.} and S. Adhikari and {Anefalos Pereira}, S. and J. Ball and I. Balossino and M. Bashkanov and M. Battaglieri and V. Batourine and I. Bedlinskiy and Biselli, {A. S.} and S. Boiarinov and Briscoe, {W. J.} and J. Brock and Brooks, {W. K.} and Burkert, {V. D.} and C. Carlin and Carman, {D. S.} and A. Celentano and G. Charles and T. Chetry and G. Ciullo and Clary, {B. A.} and Cole, {P. L.} and M. Contalbrigo and A. D'Angelo and N. Dashyan and {De Vita}, R. and A. Deur and C. Djalali and Michael Dugger and R. Dupre and {El Alaoui}, A. and {El Fassi}, L. and L. Elouadrhiri and P. Eugenio and G. Fedotov and S. Fegan and A. Filippi and A. Fradi and G. Gavalian and Barry Ritchie",
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AU - The CLAS Collaboration

AU - Roy, P.

AU - Akbar, Z.

AU - Park, S.

AU - Crede, V.

AU - Anisovich, A. V.

AU - Denisenko, I.

AU - Klempt, E.

AU - Nikonov, V. A.

AU - Sarantsev, A. V.

AU - Adhikari, K. P.

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AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brock, J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Carlin, C.

AU - Carman, D. S.

AU - Celentano, A.

AU - Charles, G.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clary, B. A.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - Deur, A.

AU - Djalali, C.

AU - Dugger, Michael

AU - Dupre, R.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Elouadrhiri, L.

AU - Eugenio, P.

AU - Fedotov, G.

AU - Fegan, S.

AU - Filippi, A.

AU - Fradi, A.

AU - Gavalian, G.

AU - Ritchie, Barry

PY - 2018/5/4

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N2 - The photoproduction of ω mesons off the proton has been studied in the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω→π+π-π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.

AB - The photoproduction of ω mesons off the proton has been studied in the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω→π+π-π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.

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