Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Witthauer, L.; Dieterle, M.; Abt, S.; Achenbach, P.; Afzal, F.; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N. S.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Costanza, S.; Collicott, C.; Denig, A.; Downie, E. J.; Drexler, P.; Ferretti-Bondy, M. I.; Gardner, S.; Garni, S.; Glazier, D. I.; Glowa, D.; Gradl, W.; Günther, M.; Gurevich, G. M.; Hamilton, D.; Hornidge, D.; Huber, G. M.; Käser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A. B.; Linturi, J. M.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; Mancell, J.; Manley, D. M.; Martel, P. P.; Metag, V.; Meyer, W.; Miskimen, R.; Mornacchi, E.; Mushkarenkov, A.; Neganov, A. B.; Neiser, A.; Oberle, M.; Ostrick, M.; Otte, P. B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Prakhov, S. N.; Rajabi, A.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; Sikora, M. H.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, Th.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Wolfes, M.; Zana, L.

doi:10.1103/PhysRevC.95.055201

Title: Helicity-dependent cross sections and double-polarization observable $E$ in $η$ photoproduction from quasifree protons and neutrons

Journal Article · Mon May 01 00:00:00 EDT 2017 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.95.055201· OSTI ID:1354757

Witthauer, L.; Dieterle, M.; Abt, S.; Achenbach, P.; Afzal, F.; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N. S.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Costanza, S.; Collicott, C.; Denig, A.; Downie, E. J. more »

Precise helicity-dependent cross sections and the double-polarization observable E were measured for η photoproduction from quasifree protons and neutrons bound in the deuteron. The η → 2γ and η → 3π⁰ → 6γ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected with the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98% of the full solid angle. The results show that the narrow structure observed earlier in the unpolarized excitation function of η photoproduction off the neutron appears only in reactions with antiparallel photon and nucleon spin (σ_1/2). It is absent for reactions with parallel spin orientation (σ_3/2) and thus very probably related to partial waves with total spin 1/2. The behavior of the angular distributions of the helicity-dependent cross sections was analyzed by fitting them with Legendre polynomials. The results are in good agreement with a model from the Bonn-Gatchina group, which uses an interference of P₁₁ and S₁₁ partial waves to explain the narrow structure.

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Research Organization:: Univ. of Massachusetts, Amherst, MA (United States); George Washington Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); German Research Foundation (DFG); Science and Technology Facilities Council (STFC) (United Kingdom); Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF)

Contributing Organization:: A2 Collaboration at MAMI

Grant/Contract Number:: FG02-99-ER41110; FG02-88ER40415; FG02-01ER41194; FG02-99ER41110; 227431; PHY-1039130; SC0016583

OSTI ID:: 1354757

Alternate ID(s):: OSTI ID: 1425343; OSTI ID: 1439805

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Vol. 95 Journal Issue: 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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References (63)

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Photon and Electron Polarization in High-Energy Bremsstrahlung and Pair Production with Screening Olsen, Haakon; Maximon, L. C. Physical Review, Vol. 114, Issue 3 https://doi.org/10.1103/PhysRev.114.887	journal	May 1959
Measurement of the beam asymmetry in η photoproduction off the proton Elsner, D.; Anisovich, A. V.; Anton, G. The European Physical Journal A, Vol. 33, Issue 2 https://doi.org/10.1140/epja/i2007-10447-9	journal	August 2007
Near Threshold Photoproduction of $η$ Mesons off the Proton Krusche, B.; Ahrens, J.; Anton, G. Physical Review Letters, Vol. 74, Issue 19 https://doi.org/10.1103/PhysRevLett.74.3736	journal	May 1995
Geant4—a simulation toolkit Agostinelli, S.; Allison, J.; Amako, K. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8	journal	July 2003
Quasifree Photoproduction of $η$ Mesons off the Neutron Jaegle, I.; Mertens, T.; Anisovich, A. V. Physical Review Letters, Vol. 100, Issue 25 https://doi.org/10.1103/PhysRevLett.100.252002	journal	June 2008
η photoproduction in the resonance energy region Shklyar, V.; Lenske, H.; Mosel, U. Physics Letters B, Vol. 650, Issue 2-3 https://doi.org/10.1016/j.physletb.2007.05.005	journal	June 2007
Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons Dieterle, M.; Oberle, M.; Ahrens, J. The European Physical Journal A, Vol. 51, Issue 11 https://doi.org/10.1140/epja/i2015-15142-8	journal	November 2015

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Title: Helicity-dependent cross sections and double-polarization observable $E$ in $η$ photoproduction from quasifree protons and neutrons