Determination of the {\eta} mass with the Crystal Ball at MAMI-B

A new precise determination of the {\eta} meson mass is presented. It is based on a measurement of the threshold for the {\gamma}p -> p{\eta} reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the st...

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Hauptverfasser: Nikolaev, A, Aguar-Bartolomé, P, Ahrens, J, Annand, J. R. M, Arends, H. J, Beck, R, Bekrenev, V, Boillat, B, Braghieri, A, Branford, D, Briscoe, W. J, Brudvik, J. W, Cherepnya, S, Codling, R, Dehn, M, Downie, E. J, Fil'kov, L. V, Glazier, D. I, Gregor, R, Heid, E, Hornidge, D, Jahn, O, Jankowiak, A, Kaiser, K. -H, Kashevarov, V. L, Kondratiev, R, Korolija, M, Kotulla, M, Krambrich, D, Krusche, B, Lang, M, Lisin, V, Livingston, K, Ludwig-Mertin, U, Lugert, S, MacGregor, I. J. D, Manley, D. M, Martinez-Fabregate, M, McGeorge, J. C, Mekterovic, D, Metag, V, Nefkens, B. M. K, Novotny, R, Owens, R. O, Pedroni, P, Polonski, A, Prakhov, S. N, Price, J. W, Reiter, A, Rosner, G, Rost, M, Rostomyan, T, Schumann, S, Sober, D, Starostin, A, Supek, I, Tarbert, C. M, Thomas, A, Unverzagt, M, Walcher, Th, Watts, D. P, Zehr, F
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creator Nikolaev, A
Aguar-Bartolomé, P
Ahrens, J
Annand, J. R. M
Arends, H. J
Beck, R
Bekrenev, V
Boillat, B
Braghieri, A
Branford, D
Briscoe, W. J
Brudvik, J. W
Cherepnya, S
Codling, R
Dehn, M
Downie, E. J
Fil'kov, L. V
Glazier, D. I
Gregor, R
Heid, E
Hornidge, D
Jahn, O
Jankowiak, A
Kaiser, K. -H
Kashevarov, V. L
Kondratiev, R
Korolija, M
Kotulla, M
Krambrich, D
Krusche, B
Lang, M
Lisin, V
Livingston, K
Ludwig-Mertin, U
Lugert, S
MacGregor, I. J. D
Manley, D. M
Martinez-Fabregate, M
McGeorge, J. C
Mekterovic, D
Metag, V
Nefkens, B. M. K
Novotny, R
Owens, R. O
Pedroni, P
Polonski, A
Prakhov, S. N
Price, J. W
Reiter, A
Rosner, G
Rost, M
Rostomyan, T
Schumann, S
Sober, D
Starostin, A
Supek, I
Tarbert, C. M
Thomas, A
Unverzagt, M
Walcher, Th
Watts, D. P
Zehr, F
description A new precise determination of the {\eta} meson mass is presented. It is based on a measurement of the threshold for the {\gamma}p -> p{\eta} reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous {\eta} mass measurement at MAMI-B. The result m{\eta} = (547.851 +- 0.031 stat. +- 0.062 syst.) MeV agrees very well with the precise values of the NA48, KLOE and CLEO collaborations and deviates by about 5{\sigma} from the smaller, but also very precise value obtained by the GEM collaboration at COSY.
doi_str_mv 10.48550/arxiv.1207.3710
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V ; Glazier, D. I ; Gregor, R ; Heid, E ; Hornidge, D ; Jahn, O ; Jankowiak, A ; Kaiser, K. -H ; Kashevarov, V. L ; Kondratiev, R ; Korolija, M ; Kotulla, M ; Krambrich, D ; Krusche, B ; Lang, M ; Lisin, V ; Livingston, K ; Ludwig-Mertin, U ; Lugert, S ; MacGregor, I. J. D ; Manley, D. M ; Martinez-Fabregate, M ; McGeorge, J. C ; Mekterovic, D ; Metag, V ; Nefkens, B. M. K ; Novotny, R ; Owens, R. O ; Pedroni, P ; Polonski, A ; Prakhov, S. N ; Price, J. W ; Reiter, A ; Rosner, G ; Rost, M ; Rostomyan, T ; Schumann, S ; Sober, D ; Starostin, A ; Supek, I ; Tarbert, C. M ; Thomas, A ; Unverzagt, M ; Walcher, Th ; Watts, D. P ; Zehr, F</creator><creatorcontrib>Nikolaev, A ; Aguar-Bartolomé, P ; Ahrens, J ; Annand, J. R. M ; Arends, H. J ; Beck, R ; Bekrenev, V ; Boillat, B ; Braghieri, A ; Branford, D ; Briscoe, W. J ; Brudvik, J. W ; Cherepnya, S ; Codling, R ; Dehn, M ; Downie, E. J ; Fil'kov, L. V ; Glazier, D. 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title Determination of the {\eta} mass with the Crystal Ball at MAMI-B
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