New analysis of ηπ tensor resonances measured at the COMPASS experiment

We present a new amplitude analysis of the ηπ D-wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700), and perform a comprehensiv...

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Veröffentlicht in:	Physics letters. B 2018-04, Vol.779 (C), p.464-472
Hauptverfasser:	Jackura, A., Fernández-Ramírez, C., Pilloni, A., Fox, G., Aghasyan, M., Akhunzyanov, R., Andrieux, V., Augustyniak, W., Ball, M., Birsa, R., Bordalo, P., Bressan, A., Chang, W.-C., Chiosso, M., Choi, I., Chumakov, A.G., Chung, S.-U., Cicuttin, A., Dasgupta, S.S., Denisov, O.Yu, Dhara, L., Doshita, N., Dziewiecki, M., Efremov, A., Faessler, M., Ferrero, A., Fischer, H., du Fresne von Hohenesche, N., Friedrich, J.M., Fuchey, E., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Herrmann, F., d'Hose, N., Iwata, T., Jary, V., Joosten, R., Jörg, P., Khokhlov, Yu.A., Kisselev, Yu, Klein, F., Kolosov, V.N., Königsmann, K., Konstantinov, V.F., Kouznetsov, O.M., Kral, Z., Kremser, P., Kroumchtein, Z.V., Kulinich, Y., Kurjata, R.P., Kveton, A., Lednev, A.A., Levillain, M., Levorato, S., Lyubovitskij, V.E., Maggiora, A., Magnon, A., Makke, N., Mamon, S.A., Matsuda, H., Matsuda, T., Meyer, M., Mitrofanov, E., Nerling, F., Neyret, D., Nový, J., Nowak, W.-D., Nunes, A.S., Ostrick, M., Panzieri, D., Pereira, F., Pešková, M., Pochodzalla, J., Polyakov, V.A., Pretz, J., Quaresma, M., Regali, C., Reicherz, G., Riedl, C., Rybnikov, A., Samoylenko, V.D., Schiavon, P., Schmieden, H., Schönning, K., Seder, E., Silva, L., Stolarski, M., Sznajder, P., Thiel, A., Vasilishin, B.I., Veloso, J., ter Wolbeek, J., Zavertyaev, M., Ziembicki, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Beschreibung
Zusammenfassung:	We present a new amplitude analysis of the ηπ D-wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2018.01.017