First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

Käser, A.; Dieterle, M.; Witthauer, L.; Abt, S.; Achenbach, P.; Adlarson, P.; Afzal, F.; Ahmed, Z.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N. S.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Downie, E. J.; Drexler, P.; Fix, A.; Garni, S.; Glazier, D. I.; Gorodnov, I.; Gradl, W.; Günther, M.; Gurevich, G. M.; Heijkenskjöld, L.; Hornidge, D.; Huber, G. M.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A. B.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; 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.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; 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:10.1016/j.physletb.2018.10.006

Title: First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

Journal Article · Thu Nov 01 00:00:00 EDT 2018 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2018.10.006· OSTI ID:1476698

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

The helicity-dependent cross sections for the photoproduction of π⁰η pairs have been measured for the first time. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball – TAPS calorimeter. The experiment used a polarized deuterated butanol target and a circularly polarized photon beam. This arrangement allowed the σ_1/2 (photon and target spin antiparallel) and σ_3/2 (parallel spins) components to be measured for quasi-free production of π⁰η pairs off protons and neutrons. The main finding is that the two helicity components contribute identically, within uncertainties, for both participant protons and neutrons. The absolute couplings for protons and neutrons are also identical. This means that nucleon resonances contributing to this reaction in the investigated energy range have almost equal electromagnetic helicity couplings, A$$n,p\atop{1/2}$$ and A$$n,p\atop{3/2}$$. Identical couplings for protons and neutrons are typical for Δ resonances and identical A_1/2 and A_3/2 components are only possible for J ≥ 3/2 states, which constrains possible contributions of nucleon resonances.

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Research Organization:: Kent State Univ., Kent, OH (United States); The George Washington Univ., Ashburn, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-99ER41110; FG02-88ER40415; FG02-01ER41194; SC0014323; SC0016583

OSTI ID:: 1476698

Alternate ID(s):: OSTI ID: 1478399; OSTI ID: 1478661

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 786 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 11 works

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Journal Article · Mon May 01 00:00:00 EDT 2017 · Physical Review. C · OSTI ID:1476698

Witthauer, L.; Dieterle, M.; Abt, S.; +84 more

Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

Journal Article · Sun Mar 01 00:00:00 EST 2020 · Physics Letters. B · OSTI ID:1476698

Sokhoyan, V.; Prakhov, S.; Fix, A.; +88 more

Insight into the Narrow Structure in

η

Photoproduction on the Neutron from Helicity-Dependent Cross Sections

Journal Article · Thu Sep 22 00:00:00 EDT 2016 · Physical Review Letters · OSTI ID:1476698

Witthauer, L.; Dieterle, M.; Abt, S.; +83 more

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pion
Eta
Photoproduction
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Title: First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

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