Exclusive measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math> decay

Adlarson, P.; Adolph, C.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bednarski, T.; Bergmann, F. S.; Berłowski, M.; Bhatt, H.; Brinkmann, K.-Th.; Büscher, M.; Calén, H.; Clement, H.; Coderre, D.; Czerwiński, E.; Doroshkevich, E.; Engels, R.; Erven, W.; Eyrich, W.; Fedorets, P.; Föhl, K.; Fransson, K.; Goldenbaum, F.; Goslawski, P.; Grigoryev, K.; Gullström, C.-O.; Hanhart, C.; Heijkenskjöld, L.; Heimlich, J.; Hejny, V.; Hinterberger, F.; Hodana, M.; Höistad, B.; Jacewicz, M.; Jany, A.; Jany, Benedykt R.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khakimova, O.; Khoukaz, A.; Kistryn, S.; Klaja, J.; Kleines, H.; Kłos, B.; Kren, F.; Krzemień, W.; Kulessa, P.; Kupść, A.; Lalwani, K.; Leupold, Stefan; Lorentz, B.; Magiera, A.; Maier, R.; Mariański, B.; Marciniewski, P.; Meißner, Ulf‐G.; Mikirtychiants, M.; Morsch, H. P.; Moskal, P.; Nandi, B. K.; Niedźwiecki, Szymon; Ohm, H.; Passfeld, A.; Pauly, C.; Río, E. Pérez del; Petri, T.; Petukhov, Y.; Пискунов, Н. М.; Pluciński, P.; Podkopał, P.; Povtoreyko, A.; Prasuhn, D.; Pricking, A.; Pysz, K.; Pyszniak, A.; Rausmann, T.; Redmer, C. F.; Ritman, J.; Roy, A.; Rudy, Z.; Sawant, S.; Schadmand, S.; Schmidt, Axel; Sefzick, T.; Serdyuk, V.; Shah, Nausheen R.; Siemaszko, M.; Siudak, R.; Skorodko, T.; Skurzok, M.; Smyrski, J.; Sopov, V.; Stassen, R.; Steṕaniak, J.; Sterzenbach, G.; Stockhorst, H.; Stollenwerk, F.; Ströher, H.; Szczurek, Antoni; Täschner, A.; Terschlüsen, Carla; Tolba, T.; Trzciński, A.; Varma, R.; Vlasov, P.; Wagner, G. J.; Wȩglorz, W.; Winnemöller, A.; Wirzba, A.; Wolke, M.; Wrońska, A.; Wüstner, P.; Wurm, P.; Yuan, X.; Yurev, L.; Zabierowski, J.; Zheng, C.; Zieliński, Marcin; Zipper, W.; Złomańczuk, J.; Żuprański, P.

doi:10.1016/j.physletb.2011.12.027

Cited by 42 publications

(34 citation statements)

References 22 publications

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“…Previous results on the radiative decay for the η meson from WASA-at-COSY [3] and KLOE [4] would profit from further measurements. Only one measurement exists for the η radiative decay [5].…”

Section: The Radiative Decay Of the η And η Mesonmentioning

confidence: 99%

Light meson decays from photon-induced reactions with CLAS

Kunkel

2016

EPJ Web Conf.

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Abstract. Photoproduction experiments with the CEBAF Large Acceptance Spectrometer CLAS at the Thomas Jefferson National Facility produce data sets with competitive statistics of light mesons. With these data sets, measurements of transition form factors for η, ω, and η mesons via conversion decays can be performed using the invariant mass distribution of the final state dileptons. Tests of fundamental symmetries and information on the light quark mass difference can be performed using a Dalitz plot analysis of the meson decay. An overview of preliminary results, from existing CLAS data, and future prospects within the newly upgraded CLAS12 apparatus are given.

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Section: The Radiative Decay Of the η And η Mesonmentioning

confidence: 99%

Light meson decays from photon-induced reactions with CLAS

Kunkel

2016

EPJ Web Conf.

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“…Various decays were indeed studied by the WASA collaboration at both CELSIUS and COSY using this reaction [276,277,278]. Although the signal-to-background ratio is much more favourable than for the pp → ppη reaction that was mentioned in Sec.…”

Section: The Dd → 4 He η Reactionmentioning

confidence: 99%

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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“…was shown to be sufficient to describe the data in the physical decay region [28,29], however, with one important difference to the vector form factor: α turns out to be large, α ∼ 1.5 GeV −2 [29,30]; see …”

Section: Universality Of Final-state Interactionsmentioning

confidence: 99%

Towards a dispersive determination of the η and η′ transition form factors

Kubis¹

2018

EPJ Web Conf.

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Abstract.We discuss status and prospects of a dispersive analysis of the η and η ′ transition form factors. Particular focus is put on the various pieces of experimental information that serve as input to such a calculation. These can help improve on the precision of an evaluation of the η and η ′ pole contributions to hadronic light-by-light scattering in the anomalous magnetic moment of the muon. Hadronic light-by-light scattering and the anomalous magnetic moment of the muonThere is a by now long-standing discrepancy between the experimental determination of the anomalous magnetic moment of the muon as measured by the BNL E821 experiment [1], and its calculation within the Standard Model [2], with both experiment and theory affected by a comparable uncertainty. With two different proposals to further improve on the accuracy of the measurement well under way [3,4], it is of utmost importance to also improve the accuracy of the theoretical Standard-Model prediction before a persistent discrepancy of potentially increased significance can be interpreted in terms of physics beyond the Standard Model. The Standard-Model uncertainty is entirely dominated by hadronic contributions. While the dominant hadronic vacuum polarization can be expressed, via a dispersion relation, in terms of measurable e + e − → hadrons total cross sections, which therefore can be further improved upon by a strong experimental effort to determine many of the exclusive channels contributing therein with yet improved precision [5], the situation for the α QED -suppressed hadronic light-by-light scattering is less straightforward, relying until recently to a much larger extent on modeling [6], with badly controlled errors.This presentation is part of an effort to analyze also the hadronic light-by-light scattering tensor using dispersion theory [7,8]. Dispersion theory makes maximal use of analyticity and unitarity, two fundamental consequences of relativistic quantum field theories that mathematically incorporate the principles of causality and probability conservation. The various (in principle infinitely many different) contributions to hadronic light-by-light scattering are organized in terms of their analytic structure, according to the cuts and poles in the different energy variables that are dictated by the above principles. This has the advantage that all contributions will be given in terms of on-shell form factors and scattering amplitudes, hence observables that can to a large extent again be related to experimentally accessible quantities [9]. An ordering principle will be to consider intermediate

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Exclusive measurement of the η→π+π−γ decay

Cited by 42 publications

References 22 publications

Light meson decays from photon-induced reactions with CLAS

Light meson decays from photon-induced reactions with CLAS

Production of η and η′ mesons on nucleons and nuclei

Towards a dispersive determination of the η and η′ transition form factors

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