Physics Letters B (Jan 2015)

Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

  • C. Adolph,
  • R. Akhunzyanov,
  • M.G. Alexeev,
  • G.D. Alexeev,
  • A. Amoroso,
  • V. Andrieux,
  • V. Anosov,
  • A. Austregesilo,
  • B. Badełek,
  • F. Balestra,
  • J. Barth,
  • G. Baum,
  • R. Beck,
  • Y. Bedfer,
  • A. Berlin,
  • J. Bernhard,
  • K. Bicker,
  • E.R. Bielert,
  • J. Bieling,
  • R. Birsa,
  • J. Bisplinghoff,
  • M. Bodlak,
  • M. Boer,
  • P. Bordalo,
  • F. Bradamante,
  • C. Braun,
  • A. Bressan,
  • M. Büchele,
  • E. Burtin,
  • L. Capozza,
  • M. Chiosso,
  • S.U. Chung,
  • A. Cicuttin,
  • M.L. Crespo,
  • Q. Curiel,
  • S. Dalla Torre,
  • S.S. Dasgupta,
  • S. Dasgupta,
  • O.Yu. Denisov,
  • S.V. Donskov,
  • N. Doshita,
  • V. Duic,
  • W. Dünnweber,
  • M. Dziewiecki,
  • A. Efremov,
  • C. Elia,
  • P.D. Eversheim,
  • W. Eyrich,
  • M. Faessler,
  • A. Ferrero,
  • M. Finger,
  • M. Finger, Jr.,
  • H. Fischer,
  • C. Franco,
  • N. du Fresne von Hohenesche,
  • J.M. Friedrich,
  • V. Frolov,
  • F. Gautheron,
  • O.P. Gavrichtchouk,
  • S. Gerassimov,
  • R. Geyer,
  • I. Gnesi,
  • B. Gobbo,
  • S. Goertz,
  • M. Gorzellik,
  • S. Grabmüller,
  • A. Grasso,
  • B. Grube,
  • T. Grussenmeyer,
  • A. Guskov,
  • F. Haas,
  • D. von Harrach,
  • D. Hahne,
  • R. Hashimoto,
  • F.H. Heinsius,
  • F. Herrmann,
  • F. Hinterberger,
  • Ch. Höppner,
  • N. Horikawa,
  • N. d'Hose,
  • S. Huber,
  • S. Ishimoto,
  • A. Ivanov,
  • Yu. Ivanshin,
  • T. Iwata,
  • R. Jahn,
  • V. Jary,
  • P. Jasinski,
  • 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,
  • 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. 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,
  • S. Neubert,
  • D. Neyret,
  • J. Novy,
  • W.-D. Nowak,
  • A.S. Nunes,
  • A.G. Olshevsky,
  • I. Orlov,
  • M. Ostrick,
  • R. Panknin,
  • D. Panzieri,
  • B. Parsamyan,
  • S. Paul,
  • D.V. Peshekhonov,
  • S. Platchkov,
  • J. Pochodzalla,
  • V.A. Polyakov,
  • J. Pretz,
  • M. Quaresma,
  • C. Quintans,
  • S. Ramos,
  • C. Regali,
  • G. Reicherz,
  • E. Rocco,
  • N.S. Rossiyskaya,
  • D.I. Ryabchikov,
  • A. Rychter,
  • V.D. Samoylenko,
  • A. Sandacz,
  • S. Sarkar,
  • I.A. Savin,
  • G. Sbrizzai,
  • P. Schiavon,
  • C. Schill,
  • T. Schlüter,
  • K. Schmidt,
  • H. Schmieden,
  • K. Schönning,
  • S. Schopferer,
  • M. Schott,
  • O.Yu. Shevchenko,
  • L. Silva,
  • L. Sinha,
  • S. Sirtl,
  • M. Slunecka,
  • S. Sosio,
  • F. Sozzi,
  • A. Srnka,
  • L. Steiger,
  • M. Stolarski,
  • M. Sulc,
  • R. Sulej,
  • H. Suzuki,
  • A. Szabelski,
  • T. Szameitat,
  • P. Sznajder,
  • S. Takekawa,
  • J. ter Wolbeek,
  • S. Tessaro,
  • F. Tessarotto,
  • F. Thibaud,
  • S. Uhl,
  • I. Uman,
  • M. Virius,
  • L. Wang,
  • T. Weisrock,
  • M. Wilfert,
  • R. Windmolders,
  • H. Wollny,
  • K. Zaremba,
  • M. Zavertyaev,
  • E. Zemlyanichkina,
  • M. Ziembicki,
  • A. Zink

Journal volume & issue
Vol. 740
pp. 303 – 311

Abstract

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Exclusive production of ηπ− and η′π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η′π− over ηπ− is found for the L=1,3,5 waves, which carry non-qq¯ quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in η′π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L=2 are different.