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

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Title:	Observation of a New Narrow Axial-Vector Meson a1(1420)
Authors:	彭仁傑;Adolph, C.;Anosov, V.;Austregesilo, A.;Badełek, B.;Beck, R.;Bedfer, Y.;Bernhard, J.;Bielert, E. R.;Boer, M.;Braun, C.;Bressan, A.;Büchele, M.;Burtin, E.;Choi, I.;Cicuttin, A.;Dasgupta, S. S.;Dasgupta, S.;Dhara, L.;Doshita, N.;Dünnweber, W.;Duic, V.;Dziewiecki, M.;Efremov, A.;Eversheim, P. D.;Eyrich, W.;Faessler, M.;du Fresne von Hohenesche, N.;Friedrich, J. M.;Gnesi, I.;Gorzellik, M.;Grabmüller, S.;Haas, F.;von Harrach, D.;Herrmann, F.;Hinterberger, F.;Horikawa, N.;d’Hose, N.;Huber, S.;Ivanov, A.;Ivanshin, Yu;Iwata, T.;Jörg, P.;Kabuß, E.;Ketzer, B.;Kisselev, Yu;Klein, F.;Kolosov, V. N.;Konorov, I.;Krämer, M.;Kroumchtein, Z. V.;Kuchinski, N.;Kunne, F.;Levillain, M.;Lichtenstadt, J.;Maggiora, A.;Magnon, A.;Makins, N.;Makke, N.;Mallot, G. K.;Marchand, C.;Marzec, J.;Matsuda, T.;Meyer, W.;Nerling, F.;Olshevsky, A. G.;Paul, S.;Peng, J.-C.;Pereira, F.;Pesek, M.;Pochodzalla, J.;Pretz, J.;Quaresma, M.;Quintans, C.;Ramos, S.;Ryabchikov, D. I.;Rychter, A.;Samoylenko, V. D.;Sandacz, A.;Savin, I. A.;Sbrizzai, G.;Schiavon, P.;Schmeing, S.;Schönning, K.;Schlüter, T.;Selyunin, A.;Sirtl, S.;Sozzi, F.;Stolarski, M.;Sulc, M.;Szabelski, A.;ter Wolbeek, J.;Tessaro, S.;Tskhay, V.;Uhl, S.;Virius, M.;Wallner, S.;Weisrock, T.;Wilfert, M.;Ziembicki, M.;Zink, A.
Contributors:	高能與強場物理研究中心
Keywords:	Bins;CERN;Channels;Cooperation;Decay;Diffraction;Isobars;Mesons
Date:	2015-08-19
Issue Date:	2026-04-23 12:06:38 (UTC+8)
Publisher:	American Physical Society;United States
Abstract:	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. 其他題名： Phys Rev Lett 出版者： United States 出版日期： 2015-08-21 出處： Physical review letters, 2015-08, Vol.115 (8), p.082001-082001, Article 082001 資源來源： American Physical Society Journals 識別號： ISSN: 0031-9007 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.115.082001 識別號： PMID: 26340182
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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