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Article
Report number arXiv:1501.05732 ; CERN-PH-EP-2015-015 ; CERN-PH-EP-2015-015
Title Observation of a new narrow axial-vector meson $a_1(1420)$
Related titleObservation of a new narrow axial-vector meson $a_1(1420)$
Author(s)

Adolph, C. (Erlangen - Nuremberg U.) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (IRFU, SPhN, Saclay) ; Anosov, V. (Dubna, JINR) ; Austregesilo, A. (CERN ; Munich, Tech. U.) ; Azevedo, C. (Aveiro U.) ; Badelek, B. (Warsaw U.) ; Balestra, F. (Turin U. ; INFN, Turin) ; Barth, J. (Bonn U.) ; Beck, R. (Bonn U., HISKP) ; Bedfer, Y. (IRFU, SPhN, Saclay ; CERN) ; Bernhard, J. (Mainz U., Inst. Kernphys. ; CERN) ; Bicker, K. (CERN ; Munich, Tech. U.) ; Bielert, E.R. (CERN) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bodlak, M. (Charles U.) ; Boer, M. (IRFU, SPhN, Saclay) ; Bordalo, P. (LIP, Lisbon ; Lisbon, IST) ; Bradamante, F. (Trieste U. ; INFN, Trieste) ; Braun, C. (Erlangen - Nuremberg U.) ; Bressan, A. (Trieste U. ; INFN, Trieste) ; Buchele, M. (Freiburg U.) ; Burtin, E. (IRFU, SPhN, Saclay) ; Chang, W.C. (Taiwan, Inst. Phys.) ; Chiosso, M. (Turin U. ; INFN, Turin) ; Choi, I. (Illinois U., Urbana) ; Chung, S.U. (Munich, Tech. U. ; Pusan Natl. U. ; Brookhaven) ; Cicuttin, A. (ICTP, Trieste ; INFN, Trieste) ; Crespo, M.L. (ICTP, Trieste ; INFN, Trieste) ; Curiel, Q. (IRFU, SPhN, Saclay) ; Dalla Torre, S. (INFN, Trieste) ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Dasgupta, S. (INFN, Trieste) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Donskov, S.V. (Kurchatov Inst., Moscow) ; Doshita, N. (Yamagata U.) ; Dunnweber, W. (Munich U.) ; Duic, V. (Trieste U.) ; Dziewiecki, M. (Warsaw U. of Tech.) ; Efremov, A. (Dubna, JINR) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Faessler, M. (Munich U.) ; Ferrero, A. (IRFU, SPhN, Saclay) ; Finger, M. (Charles U.) ; Finger, M., Jr. (Charles U.) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; von Hohenesche, N. du Fresne (Mainz U., Inst. Kernphys. ; CERN) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (CERN) ; Gautheron, F. (Ruhr U., Bochum) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gerassimov, S. (Lebedev Inst. ; Munich, Tech. U.) ; Gnesi, I. (Turin U. ; INFN, Turin) ; Gorzellik, M. (Freiburg U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grasso, A. (Turin U. ; INFN, Turin) ; Grosse-Perdekamp, M. (Illinois U., Urbana) ; Grube, B. (Munich, Tech. U.) ; Grussenmeyer, T. (Freiburg U.) ; Guskov, A. (Dubna, JINR) ; Haas, F. (Munich, Tech. U.) ; Hahne, D. (Bonn U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Hashimoto, R. (Yamagata U.) ; Heinsius, F.H. (Freiburg U.) ; Herrmann, F. (Freiburg U.) ; Hinterberger, F. (Bonn U., HISKP) ; Horikawa, N. (Nagoya U. ; Chubu U.) ; d'Hose, N. (IRFU, SPhN, Saclay) ; Hsieh, C.Yu (Taiwan, Inst. Phys.) ; Huber, S. (Munich, Tech. U.) ; Ishimoto, S. (Yamagata U. ; KEK, Tsukuba) ; Ivanov, A. (Dubna, JINR) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U., HISKP) ; Jary, V. (Prague, Tech. U.) ; Jorg, P. (Freiburg U.) ; Joosten, R. (Bonn U., HISKP) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Ketzer, B. (Munich, Tech. U. ; Bonn U.) ; Khaustov, G.V. (Kurchatov Inst., Moscow) ; Khokhlov, Yu. A. (Kurchatov Inst., Moscow ; Moscow, MIPT) ; Kisselev, Yu. (Dubna, JINR) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (NCBJ, Swierk) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Kurchatov Inst., Moscow) ; Kondo, K. (Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konorov, I. (Lebedev Inst. ; Munich, Tech. U.) ; Konstantinov, V.F. (Kurchatov Inst., Moscow) ; Kotzinian, A.M. (Turin U. ; INFN, Turin) ; Kouznetsov, O. (Dubna, JINR) ; Kramer, M. (Munich, Tech. U.) ; Kremser, P. (Freiburg U.) ; Krinner, F. (Munich, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kuchinski, N. (Dubna, JINR) ; Kunne, F. (IRFU, SPhN, Saclay) ; Kurek, K. (NCBJ, Swierk) ; Kurjata, R.P. (Warsaw U. of Tech.) ; Lednev, A.A. (Kurchatov Inst., Moscow) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levillain, M. (IRFU, SPhN, Saclay) ; Levorato, S. (INFN, Trieste) ; Lichtenstadt, J. (Tel Aviv U.) ; Maggiora, A. (INFN, Turin) ; Magnon, A. (IRFU, SPhN, Saclay) ; Makins, N. (Illinois U., Urbana) ; Makke, N. (Trieste U. ; INFN, Trieste) ; Mallot, G.K. (CERN) ; Marchand, C. (IRFU, SPhN, Saclay) ; Martin, A. (Trieste U. ; INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Matousek, J. (Charles U.) ; Matsuda, H. (Yamagata U.) ; Matsuda, T. (Miyazaki U.) ; Meshcheryakov, G. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu. V. (Kurchatov Inst., Moscow) ; Miyachi, Y. (Yamagata U.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Nerling, F. (Mainz U., Inst. Kernphys.) ; Neyret, D. (IRFU, SPhN, Saclay) ; Nikolaenko, V.I. (Kurchatov Inst., Moscow) ; Novy, J. (Prague, Tech. U. ; CERN) ; Nowak, W.D. (Freiburg U.) ; Nunes, A.S. (LIP, Lisbon) ; Olshevsky, A.G. (Dubna, JINR) ; Orlov, I. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Panzieri, D. (Piemonte Orientale U., Alessandria ; INFN, Turin) ; Parsamyan, B. (Turin U. ; INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Peng, J.C. (Illinois U., Urbana) ; Pereira, F. (Aveiro U.) ; Pesek, M. (Prague, Tech. U.) ; Peshekhonov, D.V. (Dubna, JINR) ; Platchkov, S. (IRFU, SPhN, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polyakov, V.A. (Kurchatov Inst., Moscow) ; Pretz, J. (Bonn U. ; Aachen, Tech. Hochsch.) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Ramos, S. (LIP, Lisbon ; Lisbon, IST) ; Regali, C. (Freiburg U.) ; Reicherz, G. (Ruhr U., Bochum) ; Riedl, C. (Illinois U., Urbana) ; Rocco, E. (CERN) ; Rossiyskaya, N.S. (Dubna, JINR) ; Ryabchikov, D.I. (Kurchatov Inst., Moscow) ; Rychter, A. (Warsaw U. of Tech.) ; Samoylenko, V.D. (Kurchatov Inst., Moscow) ; Sandacz, A. (NCBJ, Swierk) ; Santos, C. (INFN, Trieste) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sbrizzai, G. (Trieste U. ; INFN, Trieste) ; Schiavon, P. (Trieste U. ; INFN, Trieste) ; Schmidt, K. (Freiburg U.) ; Schmieden, H. (Bonn U.) ; Schonning, K. (CERN ; Uppsala U.) ; Schopferer, S. (Freiburg U.) ; Schluter, T. (Munich U., ASC) ; Selyunin, A. (Dubna, JINR) ; Shevchenko, O.Yu. (Dubna, JINR) ; Silva, L. (LIP, Lisbon) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sirtl, S. (Freiburg U.) ; Slunecka, M. (Dubna, JINR) ; Sozzi, F. (INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (LIP, Lisbon) ; Sulc, M. (Liberec Tech. U.) ; Suzuki, H. (Yamagata U. ; Chubu U.) ; Szabelski, A. (NCBJ, Swierk) ; Szameitat, T. (Freiburg U.) ; Sznajder, P. (NCBJ, Swierk) ; Takekawa, S. (Turin U. ; INFN, Turin) ; Wolbeek, J. ter (Freiburg U.) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Thibaud, F. (IRFU, SPhN, Saclay) ; Tskhay, V. (Lebedev Inst.) ; Uhl, S. (Munich, Tech. U.) ; Veloso, J. (Aveiro U.) ; Virius, M. (Prague, Tech. U.) ; Wallner, S. (Munich, Tech. U.) ; Weisrock, T. (Mainz U., Inst. Kernphys.) ; Wilfert, M. (Mainz U., Inst. Kernphys.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Lebedev Inst.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zink, A. (Erlangen - Nuremberg U.)

Publication 2015-08-19
Imprint 21 Jan 2015
Number of pages 6
Note Comments: 8 pages, 1 figure
8 pages, 1 figure
In: Phys. Rev. Lett. 115 (2015) 082001
DOI 10.1103/PhysRevLett.115.082001
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; COMPASS NA58
Free keywords QCD ; spectroscopy ; experimental results ; COMPASS; ; pion-nucleon scattering; ; hadron spectroscopy; ; light-meson spectrum; ; axial-vector mesons; ; exotic mesons
Abstract The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV$/c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of $3\pi$ mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow $J^{PC} = 1^{++}$ signal is observed in the $f_0(980)\,\pi$ channel. We present a resonance-model study of a subset of the spin-density matrix selecting $3\pi$ states with $J^{PC} = 2^{++}$ and $4^{++}$ decaying into $\rho(770)\,\pi$ and with $J^{PC} = 1^{++}$ decaying into $f_0(980)\,\pi$. We identify a new $a_1$ meson with mass $(1414^{+15}_{-13})$ MeV$/c^2$ and width $(153^{+8}_{-23})$ MeV$/c^2$. Within the final states investigated in our analysis, we observe the new $a_1(1420)$ decaying only into $f_0(980)\,\pi$, suggesting its exotic nature. To our knowledge, such a state has never been predicted.
Copyright/License preprint: © 2015-2024 CERN (License: CC-BY-4.0)
publication: © 2015-2024 The Author(s) (License: CC-BY-3.0)

Corresponding record in: Inspire
Email contact: andrea.bressan@cern.ch


 Registro creado el 2015-01-21, última modificación el 2024-07-20


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