E decays to ηππ in pp annihilation at rest

C. Amsler, D. S. Armstrong, C. A. Baker, B. M. Barnett, C. J. Batty, M. Benayoun, K. Beuchert, P. Birien, P. Blüm, R. Bossingham, K. Braune, J. Brose, D. V. Bugg, T. Case, A. R. Cooper, O. Cramer, K. M. Crowe, T. Degener, H. P. Dietz, N. DjaoshviliS. v. Dombrowski, M. Doser, W. Dünnweber, D. Engelhardt, M. Englert, M. A. Faessler, P. Giarritta, R. Hackmann, R. P. Haddock, F. H. Heinsius, M. Herz, N. P. Hessey, P. Hidas, C. Holzhaußen, P. Illinger, D. Jamnik, H. Kalinowsky, B. Kalteyer, B. Kämmle, T. Kiel, J. Kisiel, E. Klempt, H. Koch, C. Kolo, M. Kunze, M. Lakata, R. Landua, J. Lüdemann, H. Matthäy, R. McCrady, 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, E. Schäfer, P. Schmidt, M. Schütrumpf, 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, N. Winter, J. Zoll, B. S. Zou, Č Zupančič

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Abstract

We have observed the ηπ+π- and ηπ0π0 decay modes of the E meson in pp annihilation at rest into π+π-π0π0η. The mass and width of the E meson are 1409 ± 3 and 86 ± 10 MeV. The production and decay branching ratio is B(pp → Eππ)B(E → ηππ) = (3.3 ± 1.0) × 10-3. With a spin-parity analysis we determine that JP = 0-. The observation of the ηπ0π0 decay mode establishes that E is isoscalar (C = +1). We find that E decays to η(ππ)s (where (ππ)s is an S-wave dipion) and πa0(980)(→ πη) with a relative branching ratio of (78 ± 16) %. Using the KKπ production and decay branching ratio measured earlier we determine that B[E → KKπ] B[E → ηππ] = 0.61 ± 0.19. A comparison with observations in radiative J Ψ decays suggests that E and ι η(1416) are identical.

Original languageEnglish
Pages (from-to)389-398
Number of pages10
JournalPhysics Letters B
Volume358
Issue number3-4
DOIs
Publication statusPublished - Sep 28 1995

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Amsler, C., Armstrong, D. S., Baker, C. A., Barnett, B. M., Batty, C. J., Benayoun, M., Beuchert, K., Birien, P., Blüm, P., Bossingham, R., Braune, K., Brose, J., Bugg, D. V., Case, T., Cooper, A. R., Cramer, O., Crowe, K. M., Degener, T., Dietz, H. P., ... Zupančič, Č. (1995). E decays to ηππ in pp annihilation at rest. Physics Letters B, 358(3-4), 389-398. https://doi.org/10.1016/0370-2693(95)01040-W