Observation of a $J^{PC} = 1^{-+}$ exotic resonance in diffractive dissociation of 190 GeV/c $\pi^{-}$ into $\pi^- \pi^- \pi^+$

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the pi- pi- pi+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420000 events taken at values of the squared 4-momentum tran...

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Detalles Bibliográficos
Autores principales: Alekseev, M., Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Austregisilio, A., Badelek, B., Balestra, F., Ball, J., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, M.P., Chapiro, A., Chiosso, M., Chung, S.U., Cicuttin, A., Colantoni, M., Crespo, M.L., Dalla Torre, S., Dafni, T., Das, S., Dasgupta, S.S., Denisov, O.Yu., Dhara, L., Diaz, V., Dinkelbach, A.M., Donskov, S.V., Doshita, N., Duic, V., Dunnweber, W., Efremov, A., Eversheim, P.D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger, M., jr., Fischer, H., Franco, C., Friedrich, J.M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Grabmuller, S., Grajek, O.A., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Haas, F., von Harrach, D., Hasegawa, T., Heckmann, J., Heinsius, F.H., Hermann, R., Herrmann, F., Hess, C., Hinterberger, F., Horikawa, N., Hoppner, Ch., d'Hose, N., Ilgner, C., Ishimoto, S., Ivanov, O., Ivanshin, Yu., Iwata, T., Jahn, R., Jasinski, P., Jegou, G., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Konigsmann, Kay, Konopka, R., Konorov, I., Konstantinov, V.F., Korzenev, A., Kotzinian, A.M., Kouznetsov, O., Kowalik, K., Kramer, M., Kral, A., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Lauser, L., Le Goff, J.M., Lednev, A.A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Mann, A., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Massmann, F., Matsuda, T., Meyer, W., Michigami, T., Mikhailov, Yu.V., Moinester, M.A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J., Negrini, S., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V.I., Olshevsky, A.G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pawlukiewicz-Kaminska, B., Perevalova, E., Pesaro, G., Peshekhonov, D.V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V.A., Pontecorvo, G., Pretz, J., Quintans, C., Rajotte, J.-F., Ramos, S., Rapatsky, V., Reicherz, G., Reggiani, D., Richter, A., Robinet, F., Rocco, E., Rondio, E., Ryabchikov, D.I., Samoylenko, V.D., Sandacz, A., Santos, H., Sapozhnikov, M.G., Sarkar, S., Savin, Igor A., Sbrizza, G., Schiavon, P., Schill, C., Schlüter, Tobias, Schmitt, L., Schopferer, S., Schroder, W., Shevchenko, O.Yu., Siebert, H.-W., Silva, L., Sinha, L., Sissakian, A.N., Slunecka, M., Smirnov, G.I., Sosio, S., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Takekawa, S., Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L.G., Uman, I., Venugopal, G., Virius, M., Vlassov, N.V., Vossen, A., Weitzel, Q., Windmolders, R., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhao, J., Zhuravlev, N., Zvyagin, A.
Lenguaje:eng
Publicado: 2009
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.104.241803
http://cds.cern.ch/record/1216286
Descripción
Sumario:The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the pi- pi- pi+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV^2/c^2. The well-known resonances a1(1260), a2(1320), and pi2(1670) are clearly observed. In addition, the data show a significant natural parity exchange production of a resonance with spin-exotic quantum numbers J^PC = 1-+ at 1.66 GeV/c^2 decaying to rho pi. The resonant nature of this wave is evident from the mass-dependent phase differences to the J^PC = 2-+ and 1++ waves. From a mass-dependent fit a resonance mass of 1660 +- 10+0-64 MeV/c^2 and a width of 269+-21+42-64 MeV/c^2 is deduced.

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