Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B

Nikolaev, A.; Aguar-Bartolomé, P.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Beck, R.; Bekrenev, V.; Boillat, B.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Codling, R. F. B.; Dehn, M.; Downie, E. J.; Filʼkov, L.V.; Glazier, D. I.; Gregor, R.; Heid, E.; Hornidge, D.; Jahn, O.; Jankowiak, Andreas; Kaiser, K.-H.; Kashevarov, V. L.; Kondratiev, R.; Korolija, M.; Kotulla, M.; Krambrich, D.; Krusche, B.; Lang, Μ.; Lisin, V.; Livingston, K.; Ludwig-Mertin, U.; Lugert, S.; MacGregor, I. J. D.; Manley, D. M.; Martinez-Fabregate, M.; McGeorge, J. C.; Mekterović, D.; Metag, V.; Nefkens, B. M. K.; Novotny, R.; Owens, R.O.; Pedroni, P.; Polonski, A.; Prakhov, S.; Price, J. W.; Reiter, Andreas; Rosner, G.; Rost, M.; Rostomyan, T.; Schumann, S.; Sober, D. I.; Starostin, A.; Supek, I.; Tarbert, C. M.; Thomas, A.; Unverzagt, M.; Walcher, Th.; Watts, D. P.; Zehr, F.

doi:10.1140/epja/i2014-14058-1

Eur. Phys. J. A

2014

DOI: 10.1140/epja/i2014-14058-1

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Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B

A. Nikolaev

P. Aguar-Bartolomé²,

J. Ahrens³

et al.

Abstract: A new precise determination of the η meson mass is presented. It is based on a measurement of the threshold for the γp → pη reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous η mass measurement at MAMI-B. The result m η = (547.851 ± 0.031 stat. ± 0.062 syst. ) MeV agrees very well with the precise values o… Show more

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Cited by 6 publications

References 23 publications

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Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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Study of QCD-dynamics inηandη′production and decays

Beck

Wiedner

2017

EPJ Web Conf.

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Abstract. One aim of this project lies in studying QCD dynamics using photoproduction of η and η mesons with the CBELSA/TAPS experiment at the accelerator facility ELSA. Hadronic decay modes of η and η are analyzed that allow the study of symmetry breaking effects in QCD. Furthermore, excited η-states produced with a photon beam are studied within the scope of this project. Of special interest is hereby the nature of the η(1405). The high data samples for η-and η -photoproduction off the proton allow in addition the determination of polarization observables.

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Photoproduction of theωmeson on the proton near threshold

Strakovsky¹,

Prakhov²,

Azimov³

et al. 2015

Phys. Rev. C

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Photoproduction of the ω meson on the proton near threshold An experimental study of ω photoproduction on the proton has been conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The γp → ωp differential cross sections are measured from threshold to the incident-photon energy Eγ = 1.40 GeV (W = 1.87 GeV for the center-of-mass energy) with 15-MeV binning in Eγ and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics aspects. As an example, an estimation of the ωN scattering length αωp is provided.

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Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B

Cited by 6 publications

References 23 publications

Production of η and η′ mesons on nucleons and nuclei

Production of η and η′ mesons on nucleons and nuclei

Study of QCD-dynamics inηandη′production and decays

Photoproduction of theωmeson on the proton near threshold

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