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Observation of a New Narrow Axial-Vector Meson a1(1420).
Adolph, C; Akhunzyanov, R; Alexeev, M G; Alexeev, G D; Amoroso, A; Andrieux, V; Anosov, V; Austregesilo, A; Azevedo, C; Badelek, B; Balestra, F; Barth, J; Beck, R; Bedfer, Y; Bernhard, J; Bicker, K; Bielert, E R; Birsa, R; Bisplinghoff, J; Bodlak, M; Boer, M; Bordalo, P; Bradamante, F; Braun, C; Bressan, A; Büchele, M; Burtin, E; Chang, W-C; Chiosso, M; Choi, I; Chung, S U; Cicuttin, A; Crespo, M L; Curiel, Q; Dalla Torre, S; Dasgupta, S S; Dasgupta, S; Denisov, O Yu; Dhara, L; Donskov, S V; Doshita, N; Dünnweber, W; Duic, V; Dziewiecki, M; Efremov, A; Eversheim, P D; Eyrich, W; Faessler, M; Ferrero, A; Finger, M.
Afiliação
  • Adolph C; Universität Erlangen-Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany.
  • Akhunzyanov R; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Alexeev MG; University of Turin, Department of Physics, 10125 Turin, Italy.
  • Alexeev GD; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Amoroso A; University of Turin, Department of Physics, 10125 Turin, Italy.
  • Andrieux V; Torino Section of INFN, 10125 Turin, Italy.
  • Anosov V; CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  • Austregesilo A; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Azevedo C; CERN, 1211 Geneva 23, Switzerland.
  • Badelek B; Technische Universität München, Physik Department, 85748 Garching, Germany.
  • Balestra F; University of Aveiro, Department of Physics, 3810-193 Aveiro, Portugal.
  • Barth J; University of Warsaw, Faculty of Physics, 02-093 Warsaw, Poland.
  • Beck R; University of Turin, Department of Physics, 10125 Turin, Italy.
  • Bedfer Y; Torino Section of INFN, 10125 Turin, Italy.
  • Bernhard J; Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany.
  • Bicker K; Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany.
  • Bielert ER; CERN, 1211 Geneva 23, Switzerland.
  • Birsa R; CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  • Bisplinghoff J; CERN, 1211 Geneva 23, Switzerland.
  • Bodlak M; Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany.
  • Boer M; CERN, 1211 Geneva 23, Switzerland.
  • Bordalo P; Technische Universität München, Physik Department, 85748 Garching, Germany.
  • Bradamante F; CERN, 1211 Geneva 23, Switzerland.
  • Braun C; Trieste Section of INFN, 34127 Trieste, Italy.
  • Bressan A; Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany.
  • Büchele M; Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic.
  • Burtin E; CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  • Chang WC; LIP, 1000-149 Lisbon, Portugal.
  • Chiosso M; University of Trieste, Department of Physics, 34127 Trieste, Italy.
  • Choi I; Trieste Section of INFN, 34127 Trieste, Italy.
  • Chung SU; Universität Erlangen-Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany.
  • Cicuttin A; University of Trieste, Department of Physics, 34127 Trieste, Italy.
  • Crespo ML; Trieste Section of INFN, 34127 Trieste, Italy.
  • Curiel Q; Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany.
  • Dalla Torre S; CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  • Dasgupta SS; Academia Sinica, Institute of Physics, Taipei 11529, Taiwan.
  • Dasgupta S; University of Turin, Department of Physics, 10125 Turin, Italy.
  • Denisov OY; Torino Section of INFN, 10125 Turin, Italy.
  • Dhara L; University of Illinois at Urbana-Champaign, Department of Physics, Urbana, Illinois 61801-3080, USA.
  • Donskov SV; Technische Universität München, Physik Department, 85748 Garching, Germany.
  • Doshita N; Trieste Section of INFN, 34127 Trieste, Italy.
  • Dünnweber W; Abdus Salam ICTP, 34151 Trieste, Italy.
  • Duic V; Trieste Section of INFN, 34127 Trieste, Italy.
  • Dziewiecki M; Abdus Salam ICTP, 34151 Trieste, Italy.
  • Efremov A; CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France.
  • Eversheim PD; Trieste Section of INFN, 34127 Trieste, Italy.
  • Eyrich W; Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India.
  • Faessler M; Trieste Section of INFN, 34127 Trieste, Italy.
  • Ferrero A; Torino Section of INFN, 10125 Turin, Italy.
  • Finger M; Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India.
Phys Rev Lett ; 115(8): 082001, 2015 Aug 21.
Article em En | MEDLINE | ID: mdl-26340182
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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Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article
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Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article