/ hep-ex arXiv:1609.04503


Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI


Adlarson, P. (Uppsala U.) ; Afzal, F. (INFN, Pavia) ; Aguar-Bartolomé, P. (Kent State U.) ; Ahmed, Z. (Caltech) ; Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U., Inst. Kernphys.) ; Bantawa, K. (Kent State U.) ; Beck, R. (Texas A-M) ; Berghäuser, H. (Giessen U.) ; Biroth, M. (Kent State U.) ; Borisov, N.S. (Dubna, JINR) ; Braghieri, A. (INFN, Pavia) ; Briscoe, W.J. (George Washington U.) ; Cherepnya, S. (Lebedev Inst.) ; Cividini, F. (Kent State U.) ; Collicott, C. (St. Mary's U., Halifax) ; Costanza, S. (INFN, Pavia) ; Danilkin, I.V. (U. Mainz, PRISMA) ; Denig, A. (Mainz U.) ; Dieterle, M. (Basel U.) ; Downie, E.J. (Mainz U., Inst. Kernphys.) ; Drexler, P. (Giessen U.) ; Bondy, M. I. Ferretti (Kent State U.) ; Fil'kov, L.V. (Lebedev Inst.) ; Gardner, S. (Mainz U., Inst. Kernphys.) ; Garni, S. (Basel U.) ; Glazier, D.I. (Glasgow U.) ; Glowa, D. (Edinburgh U.) ; Gradl, W. (Mainz U.) ; Gurevich, G.M. (Moscow, INR) ; Hamilton, D.J. (Glasgow U.) ; Hornidge, D. (Mt. Allison U.) ; Huber, G.M. (Regina U.) ; Jude, T.C. (Edinburgh U.) ; Käser, A. (Basel U.) ; Kashevarov, V.L. (Mainz U., Inst. Kernphys.) ; Kay, S. (Manchester U.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Moscow, INR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Krusche, B. (Basel U.) ; Lazarev, A. (Dubna, JINR) ; Linturi, J. (Mainz U., Inst. Kernphys.) ; Lisin, V. (Moscow, INR) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Macrae, R. (Mainz U., Inst. Kernphys.) ; Manley, D.M. (Kent State U.) ; Martel, P.P. (Mt. Allison U.) ; McGeorge, J.C. (Glasgow U.) ; McNicoll, E.F. (Glasgow U.) ; Metag, V. (U. Giessen, II. Phys. Inst.) ; Middleton, D.G. (Mt. Allison U.) ; Miskimen, R. (Massachusetts U., Amherst) ; Mornacchi, E. ; Mullen, C. ; Mushkarenkov, A. (INFN, Pavia) ; Neganov, A. (Dubna, JINR) ; Neiser, A. (Kent State U.) ; Nikolaev, A. (Mainz U., Inst. Kernphys.) ; Oberle, M. (Basel U.) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Ott, P. (Mainz U., Inst. Kernphys.) ; Otte, P.B. (Mainz U., Inst. Kernphys.) ; Paudyal, D. (Dubna, JINR) ; Pedroni, P. (INFN, Pavia) ; Polonski, A. (Moscow, INR) ; Prakhov, S. (UCLA) ; Rajabi, A. (Mainz U., Inst. Kernphys.) ; Robinson, J. (Glasgow U.) ; Ron, G. (Hebrew U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, T. (Basel U.) ; Sfienti, C. (INFN, LNS) ; Sikora, M.H. (Edinburgh U.) ; Sokhoyan, V. (Kent State U.) ; Spieker, K. (INFN, Pavia) ; Steffen, O. (Mainz U., Inst. Kernphys.) ; Strakovsky, I.I. (George Washington U.) ; Strandberg, B. (Mainz U., Inst. Kernphys.) ; Strub, Th. (Basel U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Thiel, A. (Bonn U., HISKP) ; Thiel, M. (Giessen U.) ; Thomas, A. (Mainz U., Inst. Kernphys.) ; Unverzagt, M. (Mainz U., Inst. Kernphys.) ; Usov, Yu. A. (Dubna, JINR) ; Wagner, S. (Heidelberg Observ.) ; Walford, N. (Catholic U.) ; Watts, D.P. (Edinburgh U.) ; Werthmüller, D. (Glasgow U.) ; Wettig, J. (Kent State U.) ; Witthauer, L. (Basel U.) ; Wolfes, M. (Mainz U., Inst. Kernphys.) ; Zana, L.A. (Edinburgh U.)

Abstract: The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.13_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. The uncertainty obtained in the value of Lambda^{-2}_eta is lower than in previous results based on the eta -> e^+e^-g decay. The value obtained for the omega slope parameter, Lambda^{-2}_omega_pi^0 = (1.99+/-0.22_tot) GeV^{-2}, is somewhat lower than previous measurements based on omega -> pi^0 mu^+mu^-, but the results for the omega transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

Web-Page: http://inspirehep.net/record/1486671/files/eta_tff_cth_a2_07_vs_09_sys2_2x1_fig16.png; http://inspirehep.net/record/1486671/files/omega_tff_eegg_pi0ee_cth_a2_07_vs_09_syst_thr2_2x1_fig18.png; http://inspirehep.net/record/1486671/files/eta_tff_cth_a2_syst_exp_th2_2x1_fig17.png; http://inspirehep.net/record/1486671/files/omega_tff_eegg_pi0ee_cth_a2_syst_exp_th2_3x1_fig19.png; http://inspirehep.net/record/1486671/files/omega_pi0ee_pi_cuts_fig3.png; http://inspirehep.net/record/1486671/files/etaeeg_pid_dedx_fig2.png; http://inspirehep.net/record/1486671/files/eta_eeg_cth2e_a2_2007_3x1_fig7.png; http://inspirehep.net/record/1486671/files/omega_pi0ee_cthe_a2_2007_3x1_fig13.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit1_4_m30_100_fig6.png; http://inspirehep.net/record/1486671/files/cb_taps_pid_fig1.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit0_m30_100_fig5.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit2_m340_380_fig10.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit1_m340_380_fig9.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit10_m30_100_fig4.png; http://inspirehep.net/record/1486671/files/eegz34_eta_cth_2007_fit0_m340_380_fig8.png; http://inspirehep.net/record/1486671/files/pi0eez5_omega_cth_2007_fit6_m150_400_fig15.png; http://inspirehep.net/record/1486671/files/pi0eez5_omega_cth_2007_fit0_m150_400_fig14.png; http://inspirehep.net/record/1486671/files/pi0eez5_omega_cth_2007_fit6_101_m30_100_fig12.png; http://inspirehep.net/record/1486671/files/pi0eez5_omega_cth_2007_fit0_1_m30_100_fig11.png; http://inspirehep.net/record/1486671/files/arXiv:1609.04503.pdf


Note: *Temporary entry*; 19 figures, 2 tables

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