Photoproduction of ηπ pairs off nucleons and deuterons

A2 Collaboration The A2 Collaboration, A. Käser, F. Müller, J. Ahrens, J. R M Annand, H. J. Arends, K. Bantawa, P. A. Bartolome, R. Beck, A. Braghieri, W. J. Briscoe, S. Cherepnya, S. Costanza, M. Dieterle, E. J. Downie, P. Drexler, L. V. Fil’kov, A. Fix, S. Garni, D. I. Glazier & 50 others D. Hamilton, D. Hornidge, D. Howdle, G. M. Huber, I. Jaegle, T. C. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, V. Lisin, K. Livingston, I. J D MacGregor, Y. Maghrbi, J. Mancell, D. M. Manley, Z. Marinides, J. C. McGeorge, E. McNicoll, D. Mekterovic, V. Metag, S. Micanovic, D. G. Middleton, A. Mushkarenkov, A. Nikolaev, R. Novotny, M. Oberle, M. Ostrick, P. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. Robinson, T. Rostomyan, S. Schumann, M. H. Sikora, D. Sober, A. Starostin, Th Strub, I. Supek, M. Thiel, A. Thomas, M. Unverzagt, N. K. Walford, D. P. Watts, D. Werthmüller, L. Witthauer

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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 beamhelicity asymmetries have been measured for the reactions γp → pπ0η, γn → nπ0η, γp → nπ+η, and γn → pπ-n 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. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

Original languageEnglish
Article number272
JournalEuropean Physical Journal A
Volume52
Issue number9
DOIs
Publication statusPublished - 1 Sep 2016

Fingerprint

photoproduction
nucleons
deuterons
cross sections
protons
asymmetry
photon beams
photons
mass distribution
calorimeters
balls
coverings
accelerators
angular distribution
mesons
interactions
electromagnetism
neutrons
nuclei
thresholds

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

The A2 Collaboration, A. C., Käser, A., Müller, F., Ahrens, J., Annand, J. R. M., Arends, H. J., ... Witthauer, L. (2016). Photoproduction of ηπ pairs off nucleons and deuterons. European Physical Journal A, 52(9), [272]. https://doi.org/10.1140/epja/i2016-16272-1

Photoproduction of ηπ pairs off nucleons and deuterons. / The A2 Collaboration, A2 Collaboration; 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.

In: European Physical Journal A, Vol. 52, No. 9, 272, 01.09.2016.

Research output: Contribution to journalArticle

The A2 Collaboration, AC, Käser, A, Müller, F, Ahrens, J, Annand, JRM, Arends, HJ, Bantawa, K, Bartolome, PA, Beck, R, Braghieri, A, Briscoe, WJ, Cherepnya, S, Costanza, S, Dieterle, M, Downie, EJ, Drexler, P, Fil’kov, LV, Fix, A, Garni, S, Glazier, DI, Hamilton, D, Hornidge, D, Howdle, D, Huber, GM, Jaegle, I, Jude, TC, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Krusche, B, Lisin, V, Livingston, K, MacGregor, IJD, Maghrbi, Y, Mancell, J, Manley, DM, Marinides, Z, McGeorge, JC, McNicoll, E, Mekterovic, D, Metag, V, Micanovic, S, Middleton, DG, 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, MH, Sober, D, Starostin, A, Strub, T, Supek, I, Thiel, M, Thomas, A, Unverzagt, M, Walford, NK, Watts, DP, Werthmüller, D & Witthauer, L 2016, 'Photoproduction of ηπ pairs off nucleons and deuterons', European Physical Journal A, vol. 52, no. 9, 272. https://doi.org/10.1140/epja/i2016-16272-1
The A2 Collaboration AC, Käser A, Müller F, Ahrens J, Annand JRM, Arends HJ et al. Photoproduction of ηπ pairs off nucleons and deuterons. European Physical Journal A. 2016 Sep 1;52(9). 272. https://doi.org/10.1140/epja/i2016-16272-1
The A2 Collaboration, A2 Collaboration ; 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. / Photoproduction of ηπ pairs off nucleons and deuterons. In: European Physical Journal A. 2016 ; Vol. 52, No. 9.
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T1 - Photoproduction of ηπ pairs off nucleons and deuterons

AU - The A2 Collaboration, A2 Collaboration

AU - Käser, A.

AU - Müller, F.

AU - Ahrens, J.

AU - Annand, J. R M

AU - Arends, H. J.

AU - Bantawa, K.

AU - Bartolome, P. A.

AU - Beck, R.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cherepnya, S.

AU - Costanza, S.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil’kov, L. V.

AU - Fix, A.

AU - Garni, S.

AU - Glazier, D. I.

AU - Hamilton, D.

AU - Hornidge, D.

AU - Howdle, D.

AU - Huber, G. M.

AU - Jaegle, I.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J D

AU - Maghrbi, Y.

AU - Mancell, J.

AU - Manley, D. M.

AU - Marinides, Z.

AU - McGeorge, J. C.

AU - McNicoll, E.

AU - Mekterovic, D.

AU - Metag, V.

AU - Micanovic, S.

AU - Middleton, D. G.

AU - Mushkarenkov, A.

AU - Nikolaev, A.

AU - Novotny, R.

AU - Oberle, M.

AU - Ostrick, M.

AU - Otte, P.

AU - Oussena, B.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Prakhov, S.

AU - Robinson, J.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sikora, M. H.

AU - Sober, D.

AU - Starostin, A.

AU - Strub, Th

AU - Supek, I.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Walford, N. K.

AU - Watts, D. P.

AU - Werthmüller, D.

AU - Witthauer, L.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - 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 beamhelicity asymmetries have been measured for the reactions γp → pπ0η, γn → nπ0η, γp → nπ+η, and γn → pπ-n 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. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

AB - 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 beamhelicity asymmetries have been measured for the reactions γp → pπ0η, γn → nπ0η, γp → nπ+η, and γn → pπ-n 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. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

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