Evidence for two isospin zero JPC = 2-+ mesons at 1645 and 1875 MeV: CRYSTAL BARREL collaboration

J. Adomeit, C. Amsler, D. S. Armstrong, C. A. Baker, B. M. Barnett, C. J. Batty, M. Benayoun, A. Berdoz, K. Beuchert, S. Bischoff, P. Blüm, K. Braune, J. Brose, D. V. Bugg, T. Case, A. R. Cooper, O. Cramer, K. M. Crowe, T. Degener, H. P. DietzN. Djaoshvili, S. von Dombrowski, M. Doser, W. Dünnweber, D. Engelhardt, M. Englert, M. A. Faessler, P. Giaritta, R. Hackmann, R. P. Haddock, F. H. Heinsius, M. Herz, N. P. Hessey, P. Hidas, C. Holtzhaußen, P. Illinger, D. Jamnik, H. Kalinowsky, B. Kalteyer, B. Kämmle, P. Kammel, T. Kiel, J. Kisiel, E. Klempt, H. Koch, C. Kolo, M. Kunze, M. Lakata, R. Landua, J. Lüdemann, H. Matthäy, R. McCrady, J. Meier, J. P. Merlo, C. A. Meyer, L. Montanet, A. Noble, R. Ouared, F. Ould-Saada, K. Peters, C. N. Pinder, G. Pinter, S. Ravndal, C. Regenfus, J. Reißmann, S. Resag, W. Roethel, E. Schäfer, P. Schmidt, I. Scott, R. Seibert, S. Spanier, H. Stöck, C. Straßburger, U. Strohbusch, M. Suffert, U. Thoma, M. Tischhäuser, D. Urner, C. Völcker, F. Walter, D. Walther, U. Wiedner, B. S. Zou, Č Zupančič

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Abstract

Data on p̄p → ηπ0π0π0 taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for two I = 0 JPC = 2-+ resonances in ηππ. The first, at 1645 ± 14(stat.) ± 15 (syst.) MeV with width 180 +40-21 ± 25 MeV, decays to a2(1320)π with L = 0. It may be interpreted as the qq̄ 1D2 partner of π2(1670). A strong signal is also observed just above threshold in f2(1270)η with L = 0. It is 11-22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2-+ resonance at 1875 ± 20 ± 35 MeV with width 200 ± 25 ± 45 MeV. A third resonance having JPC = 2++ is observed at 2135 ± 20 ± 45 MeV with Γ = 250±25±45 MeV, decaying to both a2(1320)π and f2(1270)η with L = 1. There is no evidence for resonances with decays to a0(980)π, Qη or f0(980)η.

Original languageEnglish
Pages (from-to)227-238
Number of pages12
JournalEuropean Physical Journal C
Volume71
Issue number1
Publication statusPublished - Dec 1 2011

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ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

Adomeit, J., Amsler, C., Armstrong, D. S., Baker, C. A., Barnett, B. M., Batty, C. J., Benayoun, M., Berdoz, A., Beuchert, K., Bischoff, S., Blüm, P., Braune, K., Brose, J., Bugg, D. V., Case, T., Cooper, A. R., Cramer, O., Crowe, K. M., Degener, T., ... Zupančič, Č. (2011). Evidence for two isospin zero JPC = 2-+ mesons at 1645 and 1875 MeV: CRYSTAL BARREL collaboration. European Physical Journal C, 71(1), 227-238.