Observation of a J(PC)=1-+ exotic resonance in diffractive dissociation of 190   GeV/c π- into π- π- π+.

Published

Journal Article

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190  GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1  GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(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/c2 decaying to ρπ. 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(-64)(+0))  MeV/c2 and a width of (269±21(-64)(+42))  MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.

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Duke Authors

Cited Authors

  • Alekseev, MG; Alexakhin, VY; Alexandrov, Y; Alexeev, GD; Amoroso, A; Austregesilo, A; Badełek, 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, MP; Chapiro, A; Chiosso, M; Chung, SU; Cicuttin, A; Colantoni, M; Crespo, ML; Dalla Torre, S; Dafni, T; Das, S; Dasgupta, SS; Denisov, OY; Dhara, L; Diaz, V; Dinkelbach, AM; Donskov, SV; Doshita, N; Duic, V; Dünnweber, W; Efremov, A; El Alaoui, A; Eversheim, PD; Eyrich, W; Faessler, M; Ferrero, A; Finger, M; Fischer, H; Franco, C; Friedrich, JM; Garfagnini, R; Gautheron, F; Gavrichtchouk, OP; Gazda, R; Gerassimov, S; Geyer, R; Giorgi, M; Gobbo, B; Goertz, S; Grabmüller, S; Grajek, OA; Grasso, A; Grube, B; Gushterski, R; Guskov, A; Haas, F; von Harrach, D; Hasegawa, T; Heckmann, J; Heinsius, FH; Hermann, R; Herrmann, F; Hess, C; Hinterberger, F; Horikawa, N; Höppner, C; d'Hose, N; Ilgner, C; Ishimoto, S; Ivanov, O; Ivanshin, Y; Iwata, T; Jahn, R; Jasinski, P; Jegou, G; Joosten, R; Kabuss, E; Kang, D; Ketzer, B; Khaustov, GV; Khokhlov, YA; Kisselev, Y; Klein, F; Klimaszewski, K; Koblitz, S; Koivuniemi, JH; Kolosov, VN; Komissarov, EV; Kondo, K; Königsmann, K; Konopka, R; Konorov, I; Konstantinov, VF; Korzenev, A; Kotzinian, AM; Kouznetsov, O; Kowalik, K; Krämer, M; Kral, A; Kroumchtein, ZV; Kuhn, R; Kunne, F; Kurek, K; Lauser, L; Le Goff, JM; Lednev, AA; Lehmann, A; Levorato, S; Lichtenstadt, J; Liska, T; Maggiora, A; Maggiora, M; Magnon, A; Mallot, GK; Mann, A; Marchand, C; Marroncle, J; Martin, A; Marzec, J; Massmann, F; Matsuda, T; Maximov, AN; Meyer, W; Michigami, T; Mikhailov, YV; Moinester, MA; Mutter, A; Nagaytsev, A; Nagel, T; Nassalski, J; Negrini, T; Nerling, F; Neubert, S; Neyret, D; Nikolaenko, VI; Olshevsky, AG; Ostrick, M; Padee, A; Panknin, R; Panzieri, D; Parsamyan, B; Paul, S; Pawlukiewicz-Kaminska, B; Perevalova, E; Pesaro, G; Peshekhonov, DV; Piragino, G; Platchkov, S; Pochodzalla, J; Polak, J; Polyakov, VA; 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, DI; Samoylenko, VD; Sandacz, A; Santos, H; Sapozhnikov, MG; Sarkar, S; Savin, IA; Sbrizzai, G; Schiavon, P; Schill, C; Schlüter, T; Schmitt, L; Schopferer, S; Schröder, W; Shevchenko, OY; Siebert, H-W; Silva, L; Sinha, L; Sissakian, AN; Slunecka, M; Smirnov, GI; Sosio, S; Sozzi, F; Srnka, A; Stolarski, M; Sulc, M; Sulej, R; Takekawa, S; Tessaro, S; Tessarotto, F; Teufel, A; Tkatchev, LG; Uhl, S; Uman, I; Venugopal, G; Virius, M; Vlassov, NV; Vossen, A; Weitzel, Q; Windmolders, R; Wiślicki, W; Wollny, H; Zaremba, K; Zavertyaev, M; Zemlyanichkina, E; Ziembicki, M; Zhao, J; Zhuravlev, N; Zvyagin, A; COMPASS Collaboration,

Published Date

  • June 18, 2010

Published In

Volume / Issue

  • 104 / 24

Start / End Page

  • 241803 -

PubMed ID

  • 20867295

Pubmed Central ID

  • 20867295

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.104.241803

Language

  • eng