New analysis of the radiative decay ω→ηγ in proton-antiproton annihilation at rest

T. Case, K. M. Crowe, F. H. Heinsius, P. Kammel, M. Lakata, T. Degener, H. Koch, M. Kunze, U. Kurilla, H. Matthäy, K. Peters, M. Ratajczak, H. Stöck, B. M. Barnett, M. Herz, H. Kalinowsky, E. Klempt, B. Pick, C. Straßburger, J. S. SuhU. Thoma, K. Wittmack, P. Hidas, C. A. Baker, C. J. Batty, M. Doser, J. Kisiel, R. Landua, J. Adomeit, J. Meier, R. Ouared, R. Seibert, U. Strohbusch, A. Abele, S. Bischoff, P. Blüm, D. Engelhardt, A. Herbstrith, C. Holtzhaußen, M. Tischhäuser, D. V. Bugg, C. Hodd, B. S. Zou, R. P. Haddock, K. Braune, W. Dünnweber, M. A. Faessler, N. P. Hessey, D. Jamnik, C. Kolo, W. Roethel, C. Völcker, I. Uman, S. Wallis-Plachner, D. Walther, U. Wiedner, A. Berdoz, R. McCrady, C. A. Meyer, M. Suffert

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4 Citations (Scopus)

Abstract

We report on a measurement of the branching ratio of the rare decay ω→ηγ relative to the well known decay ω→π0γ. The ω's are produced in pp̄→ηω and pp̄→π0ω. Eigenstate mixing and interference effects of the ω and ρ0 are taken into account, as well as coherent interference with the background. We find evidence for the non-resonant annihilation channel B(pp̄→ηηγ)=(3.5±1.3)×10-5 and limit the value of B(ω →ηγ) to the range of (0.7 to 5.5)×10-4 depending on the degree of coherence with the background.

Original languageEnglish
Article number032002
Pages (from-to)1-9
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume61
Issue number3
Publication statusPublished - Feb 1 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Case, T., Crowe, K. M., Heinsius, F. H., Kammel, P., Lakata, M., Degener, T., Koch, H., Kunze, M., Kurilla, U., Matthäy, H., Peters, K., Ratajczak, M., Stöck, H., Barnett, B. M., Herz, M., Kalinowsky, H., Klempt, E., Pick, B., Straßburger, C., ... Suffert, M. (2000). New analysis of the radiative decay ω→ηγ in proton-antiproton annihilation at rest. Physical Review D - Particles, Fields, Gravitation and Cosmology, 61(3), 1-9. [032002].