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. 2010 Jun 18;104(24):241803.
doi: 10.1103/PhysRevLett.104.241803. Epub 2010 Jun 18.

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

M G Alekseev  1 , V Yu Alexakhin, Yu Alexandrov, G D Alexeev, A Amoroso, A Austregesilo, B Badełek, F Balestra, J Ball, J Barth, G Baum, Y Bedfer, J Bernhard, R Bertini, M Bettinelli, R Birsa, J Bisplinghoff, P Bordalo, F Bradamante, A Bravar, A Bressan, G Brona, E Burtin, M P Bussa, A Chapiro, M Chiosso, S U Chung, A Cicuttin, M Colantoni, M L Crespo, S Dalla Torre, T Dafni, S Das, S S Dasgupta, O Yu Denisov, L Dhara, V Diaz, A M Dinkelbach, S V Donskov, N Doshita, V Duic, W Dünnweber, A Efremov, A El Alaoui, P D Eversheim, W Eyrich, M Faessler, A Ferrero, M Finger, M Finger Jr, H Fischer, C Franco, J M Friedrich, R Garfagnini, F Gautheron, O P Gavrichtchouk, R Gazda, S Gerassimov, R Geyer, M Giorgi, B Gobbo, S Goertz, S Grabmüller, O A Grajek, A Grasso, B Grube, R Gushterski, A Guskov, F Haas, D von Harrach, T Hasegawa, J Heckmann, F H Heinsius, R Hermann, F Herrmann, C Hess, F Hinterberger, N Horikawa, Ch Höppner, N d'Hose, C Ilgner, S Ishimoto, O Ivanov, Yu Ivanshin, T Iwata, R Jahn, P Jasinski, G Jegou, R Joosten, E Kabuss, D Kang, B Ketzer, G V Khaustov, Yu A Khokhlov, Yu Kisselev, F Klein, K Klimaszewski, S Koblitz, J H Koivuniemi, V N Kolosov, E V Komissarov, K Kondo, K Königsmann, R Konopka, I Konorov, V F Konstantinov, A Korzenev, A M Kotzinian, O Kouznetsov, K Kowalik, M Krämer, A Kral, Z V Kroumchtein, R Kuhn, F Kunne, K Kurek, L Lauser, J M Le Goff, A A Lednev, A Lehmann, S Levorato, J Lichtenstadt, T Liska, A Maggiora, M Maggiora, A Magnon, G K Mallot, A Mann, C Marchand, J Marroncle, A Martin, J Marzec, F Massmann, T Matsuda, A N Maximov, W Meyer, T Michigami, Yu V Mikhailov, M A Moinester, A Mutter, A Nagaytsev, T Nagel, J Nassalski, T Negrini, F Nerling, S Neubert, D Neyret, V I Nikolaenko, A G Olshevsky, M Ostrick, A Padee, R Panknin, D Panzieri, B Parsamyan, S Paul, B Pawlukiewicz-Kaminska, E Perevalova, G Pesaro, D V Peshekhonov, G Piragino, S Platchkov, J Pochodzalla, J Polak, V A Polyakov, G Pontecorvo, J Pretz, C Quintans, J-F Rajotte, S Ramos, V Rapatsky, G Reicherz, D Reggiani, A Richter, F Robinet, E Rocco, E Rondio, D I Ryabchikov, V D Samoylenko, A Sandacz, H Santos, M G Sapozhnikov, S Sarkar, I A Savin, G Sbrizzai, P Schiavon, C Schill, T Schlüter, L Schmitt, S Schopferer, W Schröder, O Yu Shevchenko, H-W Siebert, L Silva, L Sinha, A N Sissakian, M Slunecka, G I Smirnov, S Sosio, F Sozzi, A Srnka, M Stolarski, M Sulc, R Sulej, S Takekawa, S Tessaro, F Tessarotto, A Teufel, L G Tkatchev, S Uhl, I Uman, G Venugopal, M Virius, N V Vlassov, A Vossen, Q Weitzel, R Windmolders, W Wiślicki, H Wollny, K Zaremba, M Zavertyaev, E Zemlyanichkina, M Ziembicki, J Zhao, N Zhuravlev, A Zvyagin; COMPASS Collaboration
Affiliations

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

M G Alekseev et al. Phys Rev Lett. .

Abstract

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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