Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$

Adolph C, Akhunzyanov R, Alekseev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Badelek B, Balestra F, Barth J, et al. (2014)
The European Physical Journal A 50(4).

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Abstract
The COMPASS Collaboration at CERN has investigated the reaction $\pi^- \gamma\rightarrow \pi^-\pi^-\pi^+$ embedded in the Primakoff reaction of$190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target,$\pi^- \text{Pb} \rightarrow \pi^-\pi^-\pi^+ \text{Pb}$. Exchange of quasi-realphotons is selected by isolating the sharp Coulomb peak observed at momentumtransfer below $0.001~(\text{GeV}/c)^2$. Using a partial-wave analysis theamplitudes and relative phases of the $a_2(1320)$ and $\pi_2(1670)$ mesons havebeen extracted, and the Coulomb and the diffractive contributions have beendisentangled. Measuring absolute production cross sections we have determinedthe radiative width of the $a_2(1320)$ to be $\Gamma_0(a_2(1320) \rightarrow\pi\gamma) = (358 \pm 6_{\textrm{stat}} \pm 42_{\textrm{syst}})~\textrm{keV}$.As the first measurement, $\Gamma_0(\pi_2(1670) \rightarrow \pi\gamma) = (181\pm 11_{\textrm{stat}} \pm 27_{\textrm{syst}})~\textrm{keV} \cdot(\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}/\textrm{BR}_{f_2 \pi})$ is obtained forthe radiative width of the $\pi_2(1670)$, where in this analysis the branchingratio $\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}=0.56$ has been used. We comparethese values to previous measurements and theoretical predictions.
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Adolph C, Akhunzyanov R, Alekseev MG, et al. Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$. The European Physical Journal A. 2014;50(4).
Adolph, C., Akhunzyanov, R., Alekseev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., et al. (2014). Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$. The European Physical Journal A, 50(4).
Adolph, C., Akhunzyanov, R., Alekseev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., et al. (2014). Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$. The European Physical Journal A 50.
Adolph, C., et al., 2014. Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$. The European Physical Journal A, 50(4).
C. Adolph, et al., “Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$”, The European Physical Journal A, vol. 50, 2014.
Adolph, C., Akhunzyanov, R., Alekseev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S.U., Cicuttin, A., Crespo, M.L., Curiel, Q., Torre, S.D., Dasgupta, S.S., Dasgupta, S., Denisov, O.Y., Donskov, S.V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P.D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger~jr., M., Fischer, H., Franco, C., du~Fresne~von~Hohenesche, N., Friedrich, J.M., Frolov, V., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Guskov, A., Guthoerl, T., Haas, F., Harrach, D. von, Hahne, D., Hashimoto, R., Heinsius, F.H., Herrmann, F., Hinterberger, F., Hoeppner, C., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G.V., Khokhlov, Y.A., Kisselev, Y., Klein, F., Klimaszewski, K., Koivuniemi, J.H., Kolosov, V.N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V.F., Kotzinian, A.M., Kouznetsov, O., Kral, Z., Kraemer, M., Kroumchtein, Z.V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R.P., Lednev, A.A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G.K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y.V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V.I., Novy, J., Nowak, W.-D., Nunes, A.S., Orlov, I., Olshevsky, A.G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Platchkov, S., Pochodzalla, J., Polyakov, V.A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rychter, A., Rossiyskaya, N.S., Ryabchikov, D.I., Samoylenko, V.D., Sandacz, A., Sarkar, S., Savin, I.A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O.Y., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter~Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki., M.: Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$. The European Physical Journal A. 50, (2014).
Adolph, C., Akhunzyanov, R., Alekseev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, Günter, Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger~jr., M., Fischer, H., Franco, C., du~Fresne~von~Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Guskov, A., Guthoerl, T., Haas, F., Harrach, D. von, Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kral, Z., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Orlov, I., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rychter, A., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter~Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., and Ziembicki., M. “Measurement of radiative widths of $a_2(1320)$ and $π_2(1670)$”. The European Physical Journal A 50.4 (2014).
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