Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron

A2 Collaboration at MAMI

doi:10.1103/PhysRevC.95.035208

Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron

A2 Collaboration at MAMI

Racah Institute of Physics

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35 Scopus citations

Abstract

The Dalitz decays η→e+e-γ and ω→π0e+e- have been measured in the γp→ηp and γp→ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λη-2=(1.97±0.11tot)GeV-2, is in good agreement with previous measurements of the η→e+e-γ and η→μ+μ-γ decays. The uncertainty obtained in the value of Λη-2 is lower than in previous results based on the η→e+e-γ decay. The value obtained for the ω slope parameter, Λωπ0-2=(1.99±0.21tot)GeV-2, is somewhat lower than previous measurements based on ω→π0μ+μ-, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

Original language	American English
Article number	035208
Journal	Physical Review C
Volume	95
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.95.035208
State	Published - 22 Mar 2017

Bibliographical note

Funding Information:
This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 Structuring the European Research Area program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contracts No. 200020-156983, No. 132799, No. 121781, No. 117601, and No. 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-FG02-99-ER41110, No. DE-FG02-88ER40415, and No. DE-FG02-01-ER41194) and National Science Foundation (Grants No. PHY-1039130 and No. IIA-1358175), INFN (Italy), and NSERC (Canada). We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance.

Publisher Copyright:
© 2017 American Physical Society.

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10.1103/PhysRevC.95.035208

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@article{40a629ab98444b24a6d597c647d226e7,

title = "Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron",

abstract = "The Dalitz decays η→e+e-γ and ω→π0e+e- have been measured in the γp→ηp and γp→ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λη-2=(1.97±0.11tot)GeV-2, is in good agreement with previous measurements of the η→e+e-γ and η→μ+μ-γ decays. The uncertainty obtained in the value of Λη-2 is lower than in previous results based on the η→e+e-γ decay. The value obtained for the ω slope parameter, Λωπ0-2=(1.99±0.21tot)GeV-2, is somewhat lower than previous measurements based on ω→π0μ+μ-, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.",

author = "{A2 Collaboration at MAMI} and P. Adlarson and F. Afzal and P. Aguar-Bartolom{\'e} and Z. Ahmed and Annand, {J. R.M.} and Arends, {H. J.} and K. Bantawa and R. Beck and H. Bergh{\"a}user and M. Biroth and Borisov, {N. S.} and A. Braghieri and Briscoe, {W. J.} and S. Cherepnya and F. Cividini and C. Collicott and S. Costanza and Danilkin, {I. V.} and A. Denig and M. Dieterle and Downie, {E. J.} and P. Drexler and {Ferretti Bondy}, {M. I.} and Fil'Kov, {L. V.} and S. Gardner and S. Garni and Glazier, {D. I.} and D. Glowa and W. Gradl and Gurevich, {G. M.} and Hamilton, {D. J.} and D. Hornidge and Huber, {G. M.} and Jude, {T. C.} and A. K{\"a}ser and Kashevarov, {V. L.} and S. Kay and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. Lazarev and J. Linturi and V. Lisin and K. Livingston and Macgregor, {I. J.D.} and R. Macrae and Manley, {D. M.} and Martel, {P. P.} and G. Ron",

note = "Funding Information: This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 Structuring the European Research Area program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contracts No. 200020-156983, No. 132799, No. 121781, No. 117601, and No. 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-FG02-99-ER41110, No. DE-FG02-88ER40415, and No. DE-FG02-01-ER41194) and National Science Foundation (Grants No. PHY-1039130 and No. IIA-1358175), INFN (Italy), and NSERC (Canada). We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = mar,

day = "22",

doi = "10.1103/PhysRevC.95.035208",

language = "American English",

volume = "95",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron

AU - A2 Collaboration at MAMI

AU - Adlarson, P.

AU - Afzal, F.

AU - Aguar-Bartolomé, P.

AU - Ahmed, Z.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Beck, R.

AU - Berghäuser, H.

AU - Biroth, M.

AU - Borisov, N. S.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cherepnya, S.

AU - Cividini, F.

AU - Collicott, C.

AU - Costanza, S.

AU - Danilkin, I. V.

AU - Denig, A.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Ferretti Bondy, M. I.

AU - Fil'Kov, L. V.

AU - Gardner, S.

AU - Garni, S.

AU - Glazier, D. I.

AU - Glowa, D.

AU - Gradl, W.

AU - Gurevich, G. M.

AU - Hamilton, D. J.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Jude, T. C.

AU - Käser, A.

AU - Kashevarov, V. L.

AU - Kay, S.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A.

AU - Linturi, J.

AU - Lisin, V.

AU - Livingston, K.

AU - Macgregor, I. J.D.

AU - Macrae, R.

AU - Manley, D. M.

AU - Martel, P. P.

AU - Ron, G.

N1 - Funding Information: This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 Structuring the European Research Area program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contracts No. 200020-156983, No. 132799, No. 121781, No. 117601, and No. 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-FG02-99-ER41110, No. DE-FG02-88ER40415, and No. DE-FG02-01-ER41194) and National Science Foundation (Grants No. PHY-1039130 and No. IIA-1358175), INFN (Italy), and NSERC (Canada). We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/3/22

Y1 - 2017/3/22

N2 - The Dalitz decays η→e+e-γ and ω→π0e+e- have been measured in the γp→ηp and γp→ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λη-2=(1.97±0.11tot)GeV-2, is in good agreement with previous measurements of the η→e+e-γ and η→μ+μ-γ decays. The uncertainty obtained in the value of Λη-2 is lower than in previous results based on the η→e+e-γ decay. The value obtained for the ω slope parameter, Λωπ0-2=(1.99±0.21tot)GeV-2, is somewhat lower than previous measurements based on ω→π0μ+μ-, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

AB - The Dalitz decays η→e+e-γ and ω→π0e+e- have been measured in the γp→ηp and γp→ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λη-2=(1.97±0.11tot)GeV-2, is in good agreement with previous measurements of the η→e+e-γ and η→μ+μ-γ decays. The uncertainty obtained in the value of Λη-2 is lower than in previous results based on the η→e+e-γ decay. The value obtained for the ω slope parameter, Λωπ0-2=(1.99±0.21tot)GeV-2, is somewhat lower than previous measurements based on ω→π0μ+μ-, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

UR - http://www.scopus.com/inward/record.url?scp=85016128668&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.95.035208

DO - 10.1103/PhysRevC.95.035208

M3 - Article

AN - SCOPUS:85016128668

SN - 2469-9985

VL - 95

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035208

ER -

Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron

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