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Determination of the η-transition form factor in the γp→pη→pγe+e− reaction

Physics letters : B. Bd. 701. H. 5. Amsterdam: North-Holland Publ. 2011 S. 562 - 567

Erscheinungsjahr: 2011

ISBN/ISSN: 0370-2693

Publikationstyp: Zeitschriftenaufsatz

Sprache: Englisch

Doi/URN: 10.1016/j.physletb.2011.06.069

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Inhaltszusammenfassung


The Dalitz decay eta -> gamma e(+)e(-) has been measured using the combined Crystal Ball and TAPS photon detector setup at the electron accelerator MAMI-C. Compared to the most recent transition form-factor measurement in the e(+)e(-) channel, statistics have been improved by one order of magnitude. The e(+)e(-)invariant mass distribution shows a deviation from the QED prediction for a point-like particle, which can be described by a form-factor. Using the usual monopole transition form-facto...The Dalitz decay eta -> gamma e(+)e(-) has been measured using the combined Crystal Ball and TAPS photon detector setup at the electron accelerator MAMI-C. Compared to the most recent transition form-factor measurement in the e(+)e(-) channel, statistics have been improved by one order of magnitude. The e(+)e(-)invariant mass distribution shows a deviation from the QED prediction for a point-like particle, which can be described by a form-factor. Using the usual monopole transition form-factor parameterization, F(m(2)) = (1 - m(2)/Lambda(2))(-1), a value of Lambda(-2) = (1.92 +/- 0.35(stat) +/- 0.13(syst)) GeV-2 has been determined. This value is in good agreement with a recent measurement of the eta Dalitz decay in the mu(+)mu(-) channel and with recent form-factor calculations. An improved value of the branching ratio BR(eta -> gamma e(+)e(-)) = (6.6 +/- 0.4(stat) +/- 0.4(syst)) . 10(-3) has been determined. (C) 2011 Elsevier B.V. All rights reserved.» weiterlesen» einklappen

Autoren


Berghäuser, H. (Autor)
Metag, V. (Autor)
Starostin, A. (Autor)
Aguar-Bartolomé, P. (Autor)
Akasoy, L. K. (Autor)
Annand, J. R. M. (Autor)
Bantawa, K. (Autor)
Beck, R. (Autor)
Bekrenev, V. (Autor)
Braghieri, A. (Autor)
Branford, D. (Autor)
Briscoe, W. J. (Autor)
Brudvik, J. (Autor)
Cherepnya, S. (Autor)
Demissie, B. T. (Autor)
Downie, Evangeline (Autor)
Drexler, P. (Autor)
Dieterle, M. (Autor)
Fil'kov, L. V. (Autor)
Fix, A. (Autor)
Glazier, D. I. (Autor)
Heid, E. (Autor)
Hornidge, D. (Autor)
Jahn, O. (Autor)
Jude, T. C. (Autor)
Kashevarov, V. L. (Autor)
Knezevic, A. (Autor)
Kondratiev, R. (Autor)
Korolija, M. (Autor)
Kotulla, M. (Autor)
Koulbardis, A. (Autor)
Kruglov, S. (Autor)
Krusche, B. (Autor)
Lemmer, B. (Autor)
Lisin, V. (Autor)
Livingston, K. (Autor)
MacGregor, I. J. D. (Autor)
Maghrbi, Y. (Autor)
Manley, D. M. (Autor)
Martinez-Fabregate, M. (Autor)
McGeorge, J. C. (Autor)
McNicoll, E. F. (Autor)
Mekterovic, D. (Autor)
Micanovic, S. (Autor)
Mushkarenkov, A. (Autor)
Nefkens, B. M. K. (Autor)
Nikolaev, A. (Autor)
Novotny, R. (Autor)
Ostrick, Michael (Autor)
Owens, R. O. (Autor)
Pedroni, P. (Autor)
Pheron, F. (Autor)
Polonski, A. (Autor)
Robinson, J. (Autor)
Prakhov, S. N. (Autor)
Rosner, G. (Autor)
Rostomyan, T. (Autor)
Schumann, Sven (Autor)
Sober, D. (Autor)
Suarez, I. M. (Autor)
Supek, I. (Autor)
Tarbert, C. M. (Autor)
Thiel, M. (Autor)
Thomas, Andreas (Autor)
Unverzagt, Marc (Autor)
Watts, D. P. (Autor)
Werthmüller, D. (Autor)
Zamboni, I. (Autor)
Zehr, F. (Autor)

Klassifikation


DFG Fachgebiet:
Teilchen, Kerne und Felder

DDC Sachgruppe:
Physik

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