Observation of a New Narrow Axial-Vector Meson a1(1420).

C Adolph,R Akhunzyanov,M G Alexeev,G D Alexeev,A Amoroso,V Andrieux,V Anosov,A Austregesilo,C Azevedo,B Badełek,F Balestra,J Barth,R Beck,Y Bedfer,J Bernhard,K Bicker,E R Bielert,R Birsa,J Bisplinghoff,M Bodlak,M Boer,P Bordalo,F Bradamante,C Braun,A Bressan,M Büchele,E Burtin,W-C Chang,M Chiosso,I Choi,S U Chung,A Cicuttin,M L Crespo,Q Curiel,S Dalla Torre,S S Dasgupta,S Dasgupta,O Yu Denisov,L Dhara,S V Donskov,N Doshita,W Dünnweber,V Duic,M Dziewiecki,A Efremov,P D Eversheim,W Eyrich,M Faessler,A Ferrero,M Finger,H Fischer,C Franco,N du Fresne von Hohenesche,J M Friedrich,V Frolov,F Gautheron,O P Gavrichtchouk,S Gerassimov,I Gnesi,M Gorzellik,S Grabmüller,A Grasso,M Grosse-Perdekamp,B Grube,T Grussenmeyer,A Guskov,F Haas,D Hahne,D von Harrach,R Hashimoto,F H Heinsius,F Herrmann,F Hinterberger,N Horikawa,N d'Hose,C-Yu Hsieh,S Huber,S Ishimoto,A Ivanov,Yu Ivanshin,T Iwata,R Jahn,V Jary,P Jörg,R Joosten,E Kabuß,B Ketzer,G V Khaustov,Yu A Khokhlov,Yu Kisselev,F Klein,K Klimaszewski,J H Koivuniemi,V N Kolosov,K Kondo,K Königsmann,I Konorov,V F Konstantinov,A M Kotzinian,O Kouznetsov,M Krämer,P Kremser,F Krinner,Z V Kroumchtein,N Kuchinski,F Kunne,K Kurek,R P Kurjata,A A Lednev,A Lehmann,M Levillain,S Levorato,J Lichtenstadt,A Maggiora,A Magnon,N Makins,N Makke,G K Mallot,C Marchand,A Martin,J Marzec,J Matousek,H Matsuda,T Matsuda,G Meshcheryakov,W Meyer,T Michigami,Yu V Mikhailov,Y Miyachi,A Nagaytsev,T Nagel,F Nerling,D Neyret,V I Nikolaenko,J Novy,W-D Nowak,A S Nunes,A G Olshevsky,I Orlov,M Ostrick,D Panzieri,B Parsamyan,S Paul,J-C Peng,F Pereira,M Pesek,D V Peshekhonov,S Platchkov,J Pochodzalla,V A Polyakov,J Pretz,M Quaresma,C Quintans,S Ramos,C Regali,G Reicherz,C Riedl,E Rocco,N S Rossiyskaya,D I Ryabchikov,A Rychter,V D Samoylenko,A Sandacz,C Santos,S Sarkar,I A Savin,G Sbrizzai,P Schiavon,S Schmeing,K Schmidt,H Schmieden,K Schönning,S Schopferer,T Schlüter,A Selyunin,O Yu Shevchenko,L Silva,L Sinha,S Sirtl,M Slunecka,F Sozzi,A Srnka,M Stolarski,M Sulc,H Suzuki,A Szabelski,T Szameitat,P Sznajder,S Takekawa,J Ter Wolbeek,S Tessaro,F Tessarotto,F Thibaud,V Tskhay,S Uhl,J Veloso,M Virius,S Wallner,T Weisrock,M Wilfert,K Zaremba,M Zavertyaev,E Zemlyanichkina,M Ziembicki,A Zink

Physical review letters（2015）

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摘要

The COMPASS Collaboration at CERN has measured diffractive dissociation of 190 GeV/c pions into the π(-)π(-)π(+) final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3π mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f0(980)π channel with spin, parity and C-parity quantum numbers J(PC)=1(++). We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with J(PC)=2(++) and 4(++) decaying into ρ(770)π and with J(PC)=1(++) decaying into f0(980)π. We identify a new a1 meson with mass (1414(-13)(+15)) MeV/c2 and width (153(-23)(+8)) MeV/c2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f0(980)π, suggesting its exotic nature.

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