학술논문

New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment
Document Type
Working Paper
Author
Jackura, A.Fernandez-Ramirez, C.Mikhasenko, M.Pilloni, A.Mathieu, V.Nys, J.Pauk, V.Szczepaniak, A. P.Fox, G.Aghasyan, M.Akhunzyanov, R.Alexeev, M. G.Alexeev, G. D.Amoroso, A.Andrieux, V.Anfimov, N. V.Anosov, V.Antoshkin, A.Augsten, K.Augustyniak, W.Austregesilo, A.Azevedo, C. D. R.Badelek, B.Balestra, F.Ball, M.Barth, J.Beck, R.Bedfer, Y.Bernhard, J.Bicker, K.Bielert, E. R.Birsa, R.Bodlak, M.Bordalo, P.Bradamante, F.Bressan, A.Buechele, M.Burtsev, V. E.Chang, W. -C.Chatterjee, C.Chiosso, M.Choi, I.Chumakov, A. G.Chung, S. -U.Cicuttin, A.Crespo, M. L.Torre, S. DallaDasgupta, S. S.Dasgupta, S.Denisov, O. Yu.Dhara, L.Donskov, S. V.Doshita, N.Dreisbach, Ch.Duennweber, W.Dusaev, R. R.Dziewiecki, M.Efremov, A.Eversheim, P. D.Faessler, M.Ferrero, A.Finger, M.Finger jr., M.Fischer, H.Franco, C.von Hohenesche, N. du FresneFriedrich, J. M.Frolov, V.Fuchey, E.Gautheron, F.Gavrichtchouk, O. P.Gerassimov, S.Giarra, J.Giordano, F.Gnesi, I.Gorzellik, M.Grasso, A.Perdekamp, M. GrosseGrube, B.Grussenmeyer, T.Guskov, A.Hahne, D.Hamar, G.von Harrach, D.Heinsius, F. H.Heitz, R.Herrmann, F.Horikawa, N.d'Hose, N.Hsieh, C. -Y.Huber, S.Ishimoto, S.Ivanov, A.Ivanshin, Yu.Iwata, T.Jary, V.Joosten, R.Joerg, P.Kabuss, E.Kerbizi, A.Ketzer, B.Khaustov, G. V.Khokhlov, Yu. A.Kisselev, Yu.Klein, F.Koivuniemi, J. H.Kolosov, V. N.Kondo, K.Koenigsmann, K.Konorov, I.Konstantinov, V. F.Kotzinian, A. M.Kouznetsov, O. M.Kral, Z.Kraemer, M.Kremser, P.Krinner, F.Kroumchtein, Z. V.Kulinich, Y.Kunne, F.Kurek, K.Kurjata, R. P.Kuznetsov, I. I.Kveton, A.Lednev, A. A.Levchenko, E. A.Levillain, M.Levorato, S.Lian, Y. -S.Lichtenstadt, J.Longo, R.Lyubovitskij, V. E.Maggiora, A.Magnon, A.Makins, N.Makke, N.Mallot, G. K.Mamon, S. A.Marianski, B.Martin, A.Marzec, J.Matousek, J.Matsuda, H.Matsuda, T.Meshcheryakov, G. V.Meyer, M.Meyer, W.Mikhailov, Yu. V.Mitrofanov, E.Mitrofanov, N.Miyachi, Y.Nagaytsev, A.Nerling, F.Neyret, D.Novy, J.Nowak, W. -D.Nukazuka, G.Nunes, A. S.Olshevsky, A. G.Orlov, I.Ostrick, M.Panzieri, D.Parsamyan, B.Paul, S.Peng, J. -C.Pereira, F.Pesek, M.Peskova, M.Peshekhonov, D. V.Pierre, N.Platchkov, S.Pochodzalla, J.Polyakov, V. A.Pretz, J.Quaresma, M.Quintans, C.Ramos, S.Regali, C.Reicherz, G.Riedl, C.Rogacheva, N. S.Ryabchikov, D. I.Rybnikov, A.Rychter, A.Salac, R.Samoylenko, V. D.Sandacz, A.Santos, C.Sarkar, S.Savin, I. A.Sawada, T.Sbrizzai, G.Schiavon, P.Schluter, T.Schmidt, K.Schmieden, H.Schoenning, K.Seder, E.Selyunin, A.Silva, L.Sinha, L.Sirtl, S.Slunecka, M.Smolik, J.Srnka, A.Steffen, D.Stolarski, M.Subrt, O.Sulc, M.Suzuki, H.Szabelski, A.Szameitat, T.Sznajder, P.Tasevsky, M.Tessaro, S.Tessarotto, F.Thiel, A.Tomsa, J.Tosello, F.Tskhay, V.Uhl, S.Vasilishin, B. I.Vauth, A.Veloso, J.Vidon, A.Virius, M.Wallner, S.Weisrock, T.Wilfert, M.ter Wolbeek, J.Zaremba, K.Zavada, P.Zavertyaev, M.Zemlyanichkina, E.Zhuravlev, N.Ziembicki, M.
Source
Subject
High Energy Physics - Phenomenology
High Energy Physics - Experiment
Language
Abstract
We present a new amplitude analysis of the $\eta\pi$ $D$-wave in $\pi^- p\to \eta\pi^- p$ 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 $a_2(1320)$ and the excited $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find $M=(1307 \pm 1 \pm 6)$~MeV and $\Gamma=(112 \pm 1 \pm 8)$~MeV, and for the excited state $a_2^\prime$ we obtain $M=(1720 \pm 10 \pm 60)$~MeV and $\Gamma=(280\pm 10 \pm 70)$~MeV, respectively.
Comment: 15 pages, 6 figures