Observation Of A J(Pc)=1(-+) Exotic Resonance In Diffractive Dissociation Of 190 Gev/C Pi(-) Into Pi(-)Pi(-)Pi(+)

Alekseev M G,Alexakhin V Yu,Alexandrov Yu, Alexeev G D,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 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, Dünnweber W,Efremov A,El Alaoui A, Eversheim P D, Eyrich W, Faessler M, Ferrero A,Finger M,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, Grabmüller 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, Höppner 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, Königsmann K, Konopka R, Konorov I, Konstantinov V F, Korzenev A, Kotzinian A M, Kouznetsov O,Kowalik K, Krämer 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,Maximov A N, Meyer W, Michigami T, Mikhailov Yu V, Moinester M A, Mutter A, Nagaytsev A, Nagel T,Nassalski J, Negrini T, 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 I A, Sbrizzai G, Schiavon P, Schill C,Schlüter T,Schmitt L, Schopferer S, Schröder 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, Uhl S, Uman I, Venugopal G, Virius M, Vlassov N V,Vossen A, Weitzel Q, Windmolders R,Wiślicki W, Wollny H, Zaremba K,Zavertyaev M, Zemlyanichkina E, Ziembicki M,Zhao J, Zhuravlev N, Zvyagin A, Null Null

PHYSICAL REVIEW LETTERS（2010）

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摘要

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 420 000 events taken at values of the squared 4-momentum transfer t(l) between 0.1 and 1 GeV2/c(2). The well-known resonances a(1)(1260), a(2)(1320), and pi(2)(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(-64)(+0)) MeV/c(2) and a width of (269 +/- 21(-64)(+42)) MeV/c(2) are deduced, with an intensity of (1.7 +/- 0.2)% of the total intensity.

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momentum transfer

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