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

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

Research School of High-Energy Physics

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

The Dalitz decay η→γe+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(m2)=(1-m2/Λ2)-1, a value of Λ-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 η Dalitz decay in the μ+μ- channel and with recent form-factor calculations. An improved value of the branching ratio BR(η→γe+e-)=(6.6±0.4(stat)±0.4(syst)).10-3 has been determined.

Original language	English
Pages (from-to)	562-567
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	701
Issue number	5
DOIs	https://doi.org/10.1016/j.physletb.2011.06.069
Publication status	Published - 27 Jul 2011

Keywords

Meson decays
Transition form factor

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Berghäuser, H., Metag, V., Starostin, A., Bartolomé, P. A., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Demissie, B. T., Downie, E. J., Drexler, P., Dieterle, M., ... Zehr, F. (2011). Determination of the η-transition form factor in the γp→pη→pγe+e- reaction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 701(5), 562-567. https://doi.org/10.1016/j.physletb.2011.06.069

Determination of the η-transition form factor in the γp→pη→pγe+e- reaction. / Berghäuser, H.; Metag, V.; Starostin, A.; Bartolomé, P. Aguar; Akasoy, L. K.; Annand, J. R.M.; Arends, H. J.; Bantawa, K.; Beck, R.; Bekrenev, V.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Demissie, B. T.; Downie, E. J.; Drexler, P.; Dieterle, M.; Fil'kov, L. V.; Fix, A.; Glazier, D. I.; Heid, E.; Hornidge, D.; Jahn, O.; Jude, T. C.; Kashevarov, V. L.; Knezevic, A.; Kondratiev, R.; Korolija, M.; Kotulla, M.; Koulbardis, A.; Kruglov, S.; Krusche, B.; Lemmer, B.; Lisin, V.; Livingston, K.; MacGregor, I. J.D.; Maghrbi, Y.; Manley, D. M.; Martinez-Fabregate, M.; McGeorge, J. C.; McNicoll, E. F.; Mekterovic, D.; Micanovic, S.; Mushkarenkov, A.; Nefkens, B. M.K.; Nikolaev, A.; Novotny, R.; Ostrick, M.; Owens, R. O.; Pedroni, P.; Pheron, F.; Polonski, A.; Robinson, J.; Prakhov, S. N.; Rosner, G.; Rostomyan, T.; Schumann, S.; Sober, D.; Suarez, I. M.; Supek, I.; Tarbert, C. M.; Thiel, M.; Thomas, A.; Unverzagt, M.; Watts, D. P.; Werthmüller, D.; Zamboni, I.; Zehr, F.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 701, No. 5, 27.07.2011, p. 562-567.

Research output: Contribution to journal › Article › peer-review

Berghäuser, H, Metag, V, Starostin, A, Bartolomé, PA, Akasoy, LK, Annand, JRM, Arends, HJ, Bantawa, K, Beck, R, Bekrenev, V, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Demissie, BT, Downie, EJ, Drexler, P, Dieterle, M, Fil'kov, LV, Fix, A, Glazier, DI, Heid, E, Hornidge, D, Jahn, O, Jude, TC, Kashevarov, VL, Knezevic, A, Kondratiev, R, Korolija, M, Kotulla, M, Koulbardis, A, Kruglov, S, Krusche, B, Lemmer, B, Lisin, V, Livingston, K, MacGregor, IJD, Maghrbi, Y, Manley, DM, Martinez-Fabregate, M, McGeorge, JC, McNicoll, EF, Mekterovic, D, Micanovic, S, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R, Ostrick, M, Owens, RO, Pedroni, P, Pheron, F, Polonski, A, Robinson, J, Prakhov, SN, Rosner, G, Rostomyan, T, Schumann, S, Sober, D, Suarez, IM, Supek, I, Tarbert, CM, Thiel, M, Thomas, A, Unverzagt, M, Watts, DP, Werthmüller, D, Zamboni, I & Zehr, F 2011, 'Determination of the η-transition form factor in the γp→pη→pγe+e- reaction', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 701, no. 5, pp. 562-567. https://doi.org/10.1016/j.physletb.2011.06.069

Berghäuser, H. ; Metag, V. ; Starostin, A. ; Bartolomé, P. Aguar ; Akasoy, L. K. ; Annand, J. R.M. ; Arends, H. J. ; Bantawa, K. ; Beck, R. ; Bekrenev, V. ; Braghieri, A. ; Branford, D. ; Briscoe, W. J. ; Brudvik, J. ; Cherepnya, S. ; Demissie, B. T. ; Downie, E. J. ; Drexler, P. ; Dieterle, M. ; Fil'kov, L. V. ; Fix, A. ; Glazier, D. I. ; Heid, E. ; Hornidge, D. ; Jahn, O. ; Jude, T. C. ; Kashevarov, V. L. ; Knezevic, A. ; Kondratiev, R. ; Korolija, M. ; Kotulla, M. ; Koulbardis, A. ; Kruglov, S. ; Krusche, B. ; Lemmer, B. ; Lisin, V. ; Livingston, K. ; MacGregor, I. J.D. ; Maghrbi, Y. ; Manley, D. M. ; Martinez-Fabregate, M. ; McGeorge, J. C. ; McNicoll, E. F. ; Mekterovic, D. ; Micanovic, S. ; Mushkarenkov, A. ; Nefkens, B. M.K. ; Nikolaev, A. ; Novotny, R. ; Ostrick, M. ; Owens, R. O. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Robinson, J. ; Prakhov, S. N. ; Rosner, G. ; Rostomyan, T. ; Schumann, S. ; Sober, D. ; Suarez, I. M. ; Supek, I. ; Tarbert, C. M. ; Thiel, M. ; Thomas, A. ; Unverzagt, M. ; Watts, D. P. ; Werthmüller, D. ; Zamboni, I. ; Zehr, F. / Determination of the η-transition form factor in the γp→pη→pγe+e- reaction. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2011 ; Vol. 701, No. 5. pp. 562-567.

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title = "Determination of the η-transition form factor in the γp→pη→pγe+e- reaction",

abstract = "The Dalitz decay η→γe+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(m2)=(1-m2/Λ2)-1, a value of Λ-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 η Dalitz decay in the μ+μ- channel and with recent form-factor calculations. An improved value of the branching ratio BR(η→γe+e-)=(6.6±0.4(stat)±0.4(syst)).10-3 has been determined.",

keywords = "Meson decays, Transition form factor",

author = "H. Bergh{\"a}user and V. Metag and A. Starostin and Bartolom{\'e}, {P. Aguar} and Akasoy, {L. K.} and Annand, {J. R.M.} and Arends, {H. J.} and K. Bantawa and R. Beck and V. Bekrenev and A. Braghieri and D. Branford and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and Demissie, {B. T.} and Downie, {E. J.} and P. Drexler and M. Dieterle and Fil'kov, {L. V.} and A. Fix and Glazier, {D. I.} and E. Heid and D. Hornidge and O. Jahn and Jude, {T. C.} and Kashevarov, {V. L.} and A. Knezevic and R. Kondratiev and M. Korolija and M. Kotulla and A. Koulbardis and S. Kruglov and B. Krusche and B. Lemmer and V. Lisin and K. Livingston and MacGregor, {I. J.D.} and Y. Maghrbi and Manley, {D. M.} and M. Martinez-Fabregate and McGeorge, {J. C.} and McNicoll, {E. F.} and D. Mekterovic and S. Micanovic and A. Mushkarenkov and Nefkens, {B. M.K.} and A. Nikolaev and R. Novotny and M. Ostrick and Owens, {R. O.} and P. Pedroni and F. Pheron and A. Polonski and J. Robinson and Prakhov, {S. N.} and G. Rosner and T. Rostomyan and S. Schumann and D. Sober and Suarez, {I. M.} and I. Supek and Tarbert, {C. M.} and M. Thiel and A. Thomas and M. Unverzagt and Watts, {D. P.} and D. Werthm{\"u}ller and I. Zamboni and F. Zehr",

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T1 - Determination of the η-transition form factor in the γp→pη→pγe+e- reaction

AU - Berghäuser, H.

AU - Metag, V.

AU - Starostin, A.

AU - Bartolomé, P. Aguar

AU - Akasoy, L. K.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Beck, R.

AU - Bekrenev, V.

AU - Braghieri, A.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Demissie, B. T.

AU - Downie, E. J.

AU - Drexler, P.

AU - Dieterle, M.

AU - Fil'kov, L. V.

AU - Fix, A.

AU - Glazier, D. I.

AU - Heid, E.

AU - Hornidge, D.

AU - Jahn, O.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Knezevic, A.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Koulbardis, A.

AU - Kruglov, S.

AU - Krusche, B.

AU - Lemmer, B.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J.D.

AU - Maghrbi, Y.

AU - Manley, D. M.

AU - Martinez-Fabregate, M.

AU - McGeorge, J. C.

AU - McNicoll, E. F.

AU - Mekterovic, D.

AU - Micanovic, S.

AU - Mushkarenkov, A.

AU - Nefkens, B. M.K.

AU - Nikolaev, A.

AU - Novotny, R.

AU - Ostrick, M.

AU - Owens, R. O.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Robinson, J.

AU - Prakhov, S. N.

AU - Rosner, G.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sober, D.

AU - Suarez, I. M.

AU - Supek, I.

AU - Tarbert, C. M.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

AU - Werthmüller, D.

AU - Zamboni, I.

AU - Zehr, F.

PY - 2011/7/27

Y1 - 2011/7/27

N2 - The Dalitz decay η→γe+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(m2)=(1-m2/Λ2)-1, a value of Λ-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 η Dalitz decay in the μ+μ- channel and with recent form-factor calculations. An improved value of the branching ratio BR(η→γe+e-)=(6.6±0.4(stat)±0.4(syst)).10-3 has been determined.

AB - The Dalitz decay η→γe+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(m2)=(1-m2/Λ2)-1, a value of Λ-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 η Dalitz decay in the μ+μ- channel and with recent form-factor calculations. An improved value of the branching ratio BR(η→γe+e-)=(6.6±0.4(stat)±0.4(syst)).10-3 has been determined.

KW - Meson decays

KW - Transition form factor

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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