Exotic ηπ state in p̄d annihilation at rest into π- π0η pspectator

A. Abele, J. Adomeit, C. Amsler, C. A. Baker, B. M. Barnett, C. J. Batty, M. Benayoun, A. Berdoz, K. Beuchert, S. Bischoff, P. Blüm, K. Braune, D. V. Bugg, T. Case, O. Cramer, V. Credé, K. M. Crowe, T. Degener, N. Djaoshvili, S. V. DombrowskiM. Doser, W. Dünnweber, A. Ehmanns, D. Engelhardt, M. A. Faessler, P. Giarritta, R. P. Haddock, F. H. Heinsius, M. Heinzelmann, A. Herbstrith, M. Herz, N. P. Hessey, P. Hidas, C. Hodd, C. Holtzhaußen, K. Hüttmann, D. Jamnik, H. Kalinowsky, B. Kämmle, P. Kammel, J. Kisiel, E. Klempt, H. Koch, C. Kolo, M. Kunze, U. Kurilla, M. Lakata, R. Landua, H. Matthäy, R. McCrady, J. Meier, C. A. Meyer, L. Montanet, R. Ouared, F. Ould-Saada, K. Peters, B. Pick, C. Pietra, C. N. Pinder, M. Ratajczak, C. Regenfus, S. Resag, W. Roethel, P. Schmidt, I. Scott, R. Seibert, S. Spanier, H. Stöck, C. Straßburger, U. Strohbusch, M. Suffert, U. Thoma, M. Tischhäuser, C. Völcker, S. Wallis, D. Walther, U. Wiedner, K. Wittmack, B. S. Zou, Č Zupančič

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Abstract

With antiprotons stopped in liquid deuterium, the ̄pn annihilation channel π- π0η was studied using a final sample of 52576 events obtained for a spectator proton momentum < 100 MeV/c. In the intensity distribution the ηπ P-wave is clearly apparent by its interferences with the dominant p-(770) and a2(1320) two-meson resonances. A partial wave analysis of the data yields evidence for resonant behaviour of the ηπ P-wave, which has the non-q̄q quantum numbers IG = 1-, JPC = 1-+. The extracted Breit-Wigner resonance parameters are m = (1400 ± 20 ± 20) MeV/c2 and Γ = (310 ± 50-30+50) MeV/c2.

Original languageEnglish
Pages (from-to)175-184
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume423
Issue number1-2
DOIs
Publication statusPublished - Mar 19 1998

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Abele, A., Adomeit, J., Amsler, C., Baker, C. A., Barnett, B. M., Batty, C. J., Benayoun, M., Berdoz, A., Beuchert, K., Bischoff, S., Blüm, P., Braune, K., Bugg, D. V., Case, T., Cramer, O., Credé, V., Crowe, K. M., Degener, T., Djaoshvili, N., ... Zupančič, Č. (1998). Exotic ηπ state in p̄d annihilation at rest into π- π0η pspectator. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 423(1-2), 175-184. https://doi.org/10.1016/S0370-2693(98)00123-3