Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Käser, A.; Müller, F.; Ahrens, J.; Annand, J. R.  M.; Arends, H. J.; Bantawa, K.; Bartolome, P. A.; Beck, R.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Costanza, S.; Dieterle, M.; Downie, E. J.; Drexler, P.; Fil’kov, L. V.; Fix, A.; Garni, S.; Glazier, D. I.; Hamilton, D.; Hornidge, D.; Howdle, D.; Huber, G. M.; Jaegle, I.; Jude, T. C.; Kashevarov, V. L.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lisin, V.; Livingston, K.; MacGregor, I. J.  D.; Maghrbi, Y.; Mancell, J.; Manley, D. M.; Marinides, Z.; McGeorge, J. C.; McNicoll, E.; Mekterovic, D.; Metag, V.; Micanovic, S.; Middleton, D. G.; Mushkarenkov, A.; Nikolaev, A.; Novotny, R.; Oberle, M.; Ostrick, M.; Otte, P.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S.; Robinson, J.; Rostomyan, T.; Schumann, S.; Sikora, M. H.; Sober, D.; Starostin, A.; Strub, Th.; Supek, I.; Thiel, M.; Thomas, A.; Unverzagt, M.; Walford, N. K.; Watts, D. P.; Werthmüller, D.; Witthauer, L.

doi:10.1140/epja/i2016-16272-1

Title: Photoproduction of $$\eta$$ $$\pi$$ pairs off nucleons and deuterons

Journal Article · Fri Sep 09 00:00:00 EDT 2016 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/i2016-16272-1· OSTI ID:1439891

Käser, A.; Müller, F.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bantawa, K.; Bartolome, P. A.; Beck, R.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Costanza, S.; Dieterle, M.; Downie, E. J.; Drexler, P.; Fil’kov, L. V.; Fix, A.; Garni, S.; Glazier, D. I.; Hamilton, D. more »

Quasi-free photoproduction of πη-pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to 1.9 GeV. Total cross sections, angular distributions, invariant-mass distributions of the πη and meson-nucleon pairs, and beam helicity asymmetries have been measured for the reactions γp → pπ⁰η, γn → nπ⁰η, γp → nπ⁺η, and γn → pπ^–η from nucleons bound inside the deuteron. For the γp initial-state data for free protons have also been analyzed. Finally, the total cross sections for quasi-free production of π⁰η pairs from nucleons bound in 3He nuclei have been investigated in view of final state interaction (FSI) effects. The experiments were performed at the tagged photon beam facility of the Mainz MAMI accelerator using an almost 4π covering electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. The shapes of all differential cross section data and the asymmetries are very similar for protons and neutrons and agree with the conjecture that the reactions are dominated by the sequential Δ *3/2^– → ηΔ(1232) → πηN decay chain, mainly with Δ(1700)3/2^– and Δ(1940)3/2^–. The ratios of the magnitude of the total cross sections also agree with this assumption. Furthermore, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

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Research Organization:: George Washington Univ., Washington, DC (United States)

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

Contributing Organization:: The A2 Collaboration

Grant/Contract Number:: SC0016583

OSTI ID:: 1439891

Journal Information:: European Physical Journal. A, Vol. 52, Issue 9; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (49)

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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
Photoproduction of $η$ -Mesic ${}^{3}{He}$ Pfeiffer, M.; Ahrens, J.; Annand, J. R. M. Physical Review Letters, Vol. 92, Issue 25 https://doi.org/10.1103/PhysRevLett.92.252001	journal	June 2004

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N* Photoexcitation Results from Mainz Sokhoyan, Vahe Few-Body Systems, Vol. 59, Issue 6 https://doi.org/10.1007/s00601-018-1440-5	journal	July 2018
Spectroscopy of light ${{N^*}}$ baryons Shah, Zalak; Gandhi, Keval; Kumar Rai, Ajay Chinese Physics C, Vol. 43, Issue 3 https://doi.org/10.1088/1674-1137/43/3/034102	journal	March 2019
Spectroscopy of light $N^{*}$ baryons Shah, Zalak; Gandhi, Keval; Rai, Ajay Kumar arXiv https://doi.org/10.48550/arxiv.1812.04858	text	January 2018

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