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New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron

Fuente: arXiv

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Hauptverfasser:	Prakhov, S., Heijkenskjöld, L., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Altangerel, K., Annand, J. R. M., Bashkanov, M., Beck, R., Biroth, M., Borisov, N. S., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Dieterle, M., Dolzhikov, A. S., Downie, E. J., Drexler, P., Fegan, S., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Günther, M., Gurevich, G. M., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Kay, S. J. D., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Martel, P. P., Miskimen, R., Mocanu, M., Mornacchi, E., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Rickert, E., Rostomyan, T., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., Strub, Th., Supek, I., Thiel, M., Thomas, A., Usov, Yu. A., Wagner, S., Watts, D. P., Werthmüller, D., Wettig, J., Wolfes, M., Zachariou, N.
Format:	Preprint
Veröffentlicht:	2025
Schlagworte:	High Energy Physics - Experiment
Online-Zugang:	Acceder al recurso
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_version_	1866908690512084992
author	Prakhov, S. Heijkenskjöld, L. Abt, S. Achenbach, P. Adlarson, P. Afzal, F. Ahmed, Z. Altangerel, K. Annand, J. R. M. Bashkanov, M. Beck, R. Biroth, M. Borisov, N. S. Braghieri, A. Briscoe, W. J. Cividini, F. Collicott, C. Costanza, S. Denig, A. Dieterle, M. Dolzhikov, A. S. Downie, E. J. Drexler, P. Fegan, S. Gardner, S. Ghosal, D. Glazier, D. I. Gorodnov, I. Gradl, W. Günther, M. Gurevich, G. M. Hornidge, D. Huber, G. M. Käser, A. Kashevarov, V. L. Kay, S. J. D. Korolija, M. Krusche, B. Lazarev, A. Livingston, K. Lutterer, S. MacGregor, I. J. D. Manley, D. M. Martel, P. P. Miskimen, R. Mocanu, M. Mornacchi, E. Mullen, C. Neganov, A. Neiser, A. Ostrick, M. Otte, P. B. Paudyal, D. Pedroni, P. Powell, A. Rickert, E. Rostomyan, T. Sokhoyan, V. Spieker, K. Steffen, O. Strakovsky, I. I. Strub, Th. Supek, I. Thiel, M. Thomas, A. Usov, Yu. A. Wagner, S. Watts, D. P. Werthmüller, D. Wettig, J. Wolfes, M. Zachariou, N.
author_facet	Prakhov, S. Heijkenskjöld, L. Abt, S. Achenbach, P. Adlarson, P. Afzal, F. Ahmed, Z. Altangerel, K. Annand, J. R. M. Bashkanov, M. Beck, R. Biroth, M. Borisov, N. S. Braghieri, A. Briscoe, W. J. Cividini, F. Collicott, C. Costanza, S. Denig, A. Dieterle, M. Dolzhikov, A. S. Downie, E. J. Drexler, P. Fegan, S. Gardner, S. Ghosal, D. Glazier, D. I. Gorodnov, I. Gradl, W. Günther, M. Gurevich, G. M. Hornidge, D. Huber, G. M. Käser, A. Kashevarov, V. L. Kay, S. J. D. Korolija, M. Krusche, B. Lazarev, A. Livingston, K. Lutterer, S. MacGregor, I. J. D. Manley, D. M. Martel, P. P. Miskimen, R. Mocanu, M. Mornacchi, E. Mullen, C. Neganov, A. Neiser, A. Ostrick, M. Otte, P. B. Paudyal, D. Pedroni, P. Powell, A. Rickert, E. Rostomyan, T. Sokhoyan, V. Spieker, K. Steffen, O. Strakovsky, I. I. Strub, Th. Supek, I. Thiel, M. Thomas, A. Usov, Yu. A. Wagner, S. Watts, D. P. Werthmüller, D. Wettig, J. Wolfes, M. Zachariou, N.
contents	The Dalitz decay $π^0 \to e^+e^-γ$ has been measured with the highest statistical accuracy obtained so far in the $γp\to π^0 p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value of the slope parameter for the $π^0$ electromagnetic transition form factor, $a_π=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$, is obtained from the analysis of $2.4\times10^6$ $π^0 \to e^+e^-γ$ observed decays. Within experimental uncertainties, it is in agreement with existing measurements and theoretical calculations, with its own uncertainty being smaller than previous results based on the analysis of $π^0\to e^+e^-γ$ decays.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_03431
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron Prakhov, S. Heijkenskjöld, L. Abt, S. Achenbach, P. Adlarson, P. Afzal, F. Ahmed, Z. Altangerel, K. Annand, J. R. M. Bashkanov, M. Beck, R. Biroth, M. Borisov, N. S. Braghieri, A. Briscoe, W. J. Cividini, F. Collicott, C. Costanza, S. Denig, A. Dieterle, M. Dolzhikov, A. S. Downie, E. J. Drexler, P. Fegan, S. Gardner, S. Ghosal, D. Glazier, D. I. Gorodnov, I. Gradl, W. Günther, M. Gurevich, G. M. Hornidge, D. Huber, G. M. Käser, A. Kashevarov, V. L. Kay, S. J. D. Korolija, M. Krusche, B. Lazarev, A. Livingston, K. Lutterer, S. MacGregor, I. J. D. Manley, D. M. Martel, P. P. Miskimen, R. Mocanu, M. Mornacchi, E. Mullen, C. Neganov, A. Neiser, A. Ostrick, M. Otte, P. B. Paudyal, D. Pedroni, P. Powell, A. Rickert, E. Rostomyan, T. Sokhoyan, V. Spieker, K. Steffen, O. Strakovsky, I. I. Strub, Th. Supek, I. Thiel, M. Thomas, A. Usov, Yu. A. Wagner, S. Watts, D. P. Werthmüller, D. Wettig, J. Wolfes, M. Zachariou, N. High Energy Physics - Experiment The Dalitz decay $π^0 \to e^+e^-γ$ has been measured with the highest statistical accuracy obtained so far in the $γp\to π^0 p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value of the slope parameter for the $π^0$ electromagnetic transition form factor, $a_π=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$, is obtained from the analysis of $2.4\times10^6$ $π^0 \to e^+e^-γ$ observed decays. Within experimental uncertainties, it is in agreement with existing measurements and theoretical calculations, with its own uncertainty being smaller than previous results based on the analysis of $π^0\to e^+e^-γ$ decays.
title	New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2512.03431