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

H. Berghaeuser; V. Metag; A. Starostin; P. Aguar Bartolome; 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'kov; A. 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. Werthmueller; I. Zamboni; F. Zehr

doi:10.1016/j.physletb.2011.06.069

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

H. Berghaeuser, V. Metag, A. Starostin, P. Aguar Bartolome, 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. Werthmueller, I. Zamboni, F. Zehr

School of Physics and Astronomy

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

Abstract

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.

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

Keywords / Materials (for Non-textual outputs)

Meson decays
Transition form factor

Access to Document

10.1016/j.physletb.2011.06.069

Illuminating strongly interacting matter
Watts, D. (Principal Investigator)
STFC
1/06/09 → 31/12/13
Project: Research

Cite this

Berghaeuser, H., Metag, V., Starostin, A., Bartolome, 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 B, 701(5), 562-567. https://doi.org/10.1016/j.physletb.2011.06.069

@article{38d68ef3cfc84cb7a51be373d43d8162,

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

abstract = "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.",

keywords = "Meson decays, Transition form factor",

author = "H. Berghaeuser and V. Metag and A. Starostin and Bartolome, \{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. Werthmueller and I. Zamboni and F. Zehr",

year = "2011",

month = jul,

day = "27",

doi = "10.1016/j.physletb.2011.06.069",

language = "English",

volume = "701",

pages = "562--567",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "5",

}

Berghaeuser, H, Metag, V, Starostin, A, Bartolome, 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, Werthmueller, D, Zamboni, I & Zehr, F 2011, 'Determination of the η-transition form factor in the γp→pη→pγe+e− reaction', Physics Letters B, vol. 701, no. 5, pp. 562-567. https://doi.org/10.1016/j.physletb.2011.06.069

TY - JOUR

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

AU - Berghaeuser, H.

AU - Metag, V.

AU - Starostin, A.

AU - Bartolome, 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 - Werthmueller, D.

AU - Zamboni, I.

AU - Zehr, F.

PY - 2011/7/27

Y1 - 2011/7/27

N2 - 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.

AB - 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.

KW - Meson decays

KW - Transition form factor

U2 - 10.1016/j.physletb.2011.06.069

DO - 10.1016/j.physletb.2011.06.069

M3 - Article

SN - 0370-2693

VL - 701

SP - 562

EP - 567

JO - Physics Letters B

JF - Physics Letters B

IS - 5

ER -

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

Abstract

Keywords / Materials (for Non-textual outputs)

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Illuminating strongly interacting matter

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