skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of the helicity asymmetry E in ω π + π - π 0 photoproduction

Abstract

The double-polarization observable $E$ was studied for the reaction $$\gamma p\to p\omega$$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $$\omega\to\pi^+\pi^-\pi^0$$, using a circularly-polarized tagged-photon beam with energies ranging from the $$\omega$$ threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the $3/2^+$ partial wave near threshold, which is identified with the sub-threshold $$N(1720)\,3/2^+$$ nucleon resonance. To describe the entire data set, which consisted of $$\omega$$ differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. Here, with respect to non-resonant mechanisms, $$\pi$$ exchange in the $t$-channel was found to remain small across the analyzed energy range, while pomeron $t$-channel exchange gradually grew from the reaction threshold to dominate all other contributions above $$W \approx 2$$ GeV.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
The CLAS Collaboration
OSTI Identifier:
1416533
Alternate Identifier(s):
OSTI ID: 1416450; OSTI ID: 1439827
Report Number(s):
JLAB-PHY-17-2532; DOE/OR/23177-4227; arXiv:1708.02608
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1800954
Grant/Contract Number:  
AC05-06OR23177; SFB/TR110; 16-12-10267; SC0016583
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; meson photoproduction

Citation Formats

Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fradi, A., Garçon, M., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Meekins, D. G., Mineeva, T., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zhao, Z. W. Measurement of the helicity asymmetry E in ω→π+π-π0 photoproduction. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.065209.
Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fradi, A., Garçon, M., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Meekins, D. G., Mineeva, T., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., & Zhao, Z. W. Measurement of the helicity asymmetry E in ω→π+π-π0 photoproduction. United States. doi:10.1103/PhysRevC.96.065209.
Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fradi, A., Garçon, M., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Meekins, D. G., Mineeva, T., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zhao, Z. W. Thu . "Measurement of the helicity asymmetry E in ω→π+π-π0 photoproduction". United States. doi:10.1103/PhysRevC.96.065209. https://www.osti.gov/servlets/purl/1416533.
@article{osti_1416533,
title = {Measurement of the helicity asymmetry E in ω→π+π-π0 photoproduction},
author = {Akbar, Z. and Roy, P. and Park, S. and Crede, V. and Anisovich, A. V. and Denisenko, I. and Klempt, E. and Nikonov, V. A. and Sarantsev, A. V. and Adhikari, K. P. and Adhikari, S. and Amaryan, M. J. and Anefalos Pereira, S. and Avakian, H. and Ball, J. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Boiarinov, S. and Briscoe, W. J. and Brock, J. and Brooks, W. K. and Burkert, V. D. and Cao, F. T. and Carlin, C. and Carman, D. S. and Celentano, A. and Charles, G. and Chetry, T. and Ciullo, G. and Clark, L. and Cole, P. L. and Contalbrigo, M. and Cortes, O. and D'Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Deur, A. and Djalali, C. and Dugger, M. and Dupre, R. and Egiyan, H. and El Fassi, L. and Eugenio, P. and Fedotov, G. and Fersch, R. and Filippi, A. and Fradi, A. and Garçon, M. and Gevorgyan, N. and Giovanetti, K. L. and Girod, F. X. and Gleason, C. and Gohn, W. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Harrison, N. and Hattawy, M. and Heddle, D. and Hicks, K. and Hollis, G. and Holtrop, M. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Joosten, S. and Keith, C. D. and Keller, D. and Khachatryan, G. and Khachatryan, M. and Khandaker, M. and Kim, A. and Kim, W. and Klein, A. and Klein, F. J. and Kubarovsky, V. and Lanza, L. and Livingston, K. and MacGregor, I. J. D. and Markov, N. and McKinnon, B. and Meekins, D. G. and Mineeva, T. and Mokeev, V. and Movsisyan, A. and Munoz Camacho, C. and Nadel-Turonski, P. and Niccolai, S. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Paremuzyan, R. and Park, K. and Pasyuk, E. and Phelps, W. and Pogorelko, O. and Price, J. W. and Prok, Y. and Protopopescu, D. and Raue, B. A. and Ripani, M. and Ritchie, B. G. and Rizzo, A. and Rosner, G. and Sabatié, F. and Salgado, C. and Schumacher, R. A. and Sharabian, Y. G. and Skorodumina, Iu. and Smith, G. D. and Sober, D. I. and Sokhan, D. and Sparveris, N. and Stepanyan, S. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Wei, X. and Wood, M. H. and Zachariou, N. and Zana, L. and Zhang, J. and Zhao, Z. W.},
abstractNote = {The double-polarization observable $E$ was studied for the reaction $\gamma p\to p\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $\omega\to\pi^+\pi^-\pi^0$, using a circularly-polarized tagged-photon beam with energies ranging from the $\omega$ threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the $3/2^+$ partial wave near threshold, which is identified with the sub-threshold $N(1720)\,3/2^+$ nucleon resonance. To describe the entire data set, which consisted of $\omega$ differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. Here, with respect to non-resonant mechanisms, $\pi$ exchange in the $t$-channel was found to remain small across the analyzed energy range, while pomeron $t$-channel exchange gradually grew from the reaction threshold to dominate all other contributions above $W \approx 2$ GeV.},
doi = {10.1103/PhysRevC.96.065209},
journal = {Physical Review C},
issn = {2469-9985},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1. FIG. 1.: (Color online) Degree of circular-photon polarization as a function of photon energy for the two CEBAF energies of 1.645 GeV (blue) and 2.478 GeV (green).

Save / Share:

Works referenced in this record:

Measurement of double polarisation asymmetries in ω -photoproduction
journal, November 2015


Review of Particle Physics
journal, October 2016


Multivariate side-band subtraction using probabilistic event weights
journal, October 2009


The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003

  • Mecking, B. A.; Adams, G.; Ahmad, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3
  • DOI: 10.1016/S0168-9002(03)01001-5

Nucleonic resonance excitations with linearly polarized photons in γ p ω p
journal, January 2001


Evidence for Nucleon-Resonance Excitation in ω -Meson Photoproduction
journal, April 2006


Elastic Photoproduction of ω Mesons from Hydrogen, Deuterium, and Complex Nuclei
journal, June 1976


Measurement of the Σ beam asymmetry for the ω photoproduction off the proton and the neutron at the GRAAL experiment
journal, June 2015


Principles of dynamic nuclear polarisation
journal, March 1978


Differential cross sections and spin density matrix elements for the reaction γ p p ω
journal, December 2009


A new highly segmented start counter for the CLAS detector
journal, January 2006

  • Sharabian, Y. G.; Battaglieri, M.; Burkert, V. D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 556, Issue 1
  • DOI: 10.1016/j.nima.2005.10.031

Partial wave analysis of the reaction γ p p ω and the search for nucleon resonances
journal, December 2009


Measurement of the beam asymmetry Σ for π 0 and η photoproduction on the proton at E γ = 9 GeV
journal, April 2017


Photon beam asymmetry Σ in the reaction γ p p ω for E γ = 1.152 to 1.876 GeV
journal, October 2017


Photoproduction of the ω meson on the proton near threshold
journal, April 2015


First measurement of the polarization observable E in the p ( γ , π + ) n reaction up to 2.25 GeV
journal, November 2015


Low-energy photoproduction of $\omega$ -mesons
journal, October 2003


Photoproduction of ω mesons off the proton
journal, October 2015


Exclusive vector meson production at HERA
journal, March 1995


Photon and Electron Polarization in High-Energy Bremsstrahlung and Pair Production with Screening
journal, May 1959


The CLAS drift chamber system
journal, July 2000

  • Mestayer, M. D.; Carman, D. S.; Asavapibhop, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 449, Issue 1-2
  • DOI: 10.1016/S0168-9002(00)00151-0

The photoproduction of vector mesons
journal, February 2002


The Jefferson Lab frozen spin target
journal, August 2012

  • Keith, C. D.; Brock, J.; Carlin, C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 684
  • DOI: 10.1016/j.nima.2012.04.067

Baryon spectroscopy
journal, April 2010


A study of the reactions ?p??p and ?p??p and ?p???+
journal, September 1984

  • Barber, D. P.; Dainton, J. B.; Lee, L. C. Y.
  • Zeitschrift f�r Physik C Particles and Fields, Vol. 26, Issue 3
  • DOI: 10.1007/BF01452559

The bremsstrahlung tagged photon beam in Hall B at JLab
journal, February 2000

  • Sober, D. I.; Crannell, Hall; Longhi, Alberto
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 440, Issue 2
  • DOI: 10.1016/S0168-9002(99)00784-6

Vector-Meson Production by Polarized Photons at 2.8, 4.7, and 9.3 GeV
journal, June 1973


$$N\bar N$$ annihilation at rest into five pions
journal, September 1993

  • Weidenauer, P.; Duch, K. D.; Kalinowsky, H.
  • Zeitschrift f�r Physik C Particles and Fields, Vol. 59, Issue 3
  • DOI: 10.1007/BF01498619

N⁎ decays to Nω from new data on γp→ωp
journal, April 2016


The time-of-flight system for CLAS
journal, August 1999

  • Smith, E. S.; Carstens, T.; Distelbrink, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 432, Issue 2-3
  • DOI: 10.1016/S0168-9002(99)00484-2

Progress towards understanding baryon resonances
journal, June 2013


Beam asymmetries in near-threshold ω photoproduction off the proton
journal, December 2008


First measurement of the helicity asymmetry E in photoproduction on the proton
journal, April 2016


Systematic Regge theory analysis of ω photoproduction
journal, May 2003


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.