Measurement of the decay distribution of η′ → π+π-γ and evidence for the box anomaly

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, J. Brose, D. V. Bugg, T. Case, A. Cooper, O. Cramer, K. M. Crowe, T. Degener, N. DjaoshviliS. V. Dombrowski, M. Doser, W. Dünnweber, D. Engelhardt, M. A. Faessler, P. Giarritta, R. Hackmann, R. P. Haddock, F. H. Heinsius, M. Heinzelmann, M. Herz, N. P. Hessey, P. Hidas, C. Hodd, C. Holtzhaußen, 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, C. A. Meyer, L. Montanet, R. Ouared, F. Ould-Saada, K. Peters, C. Pietra, C. N. Pinder, G. Pinter, C. Regenfus, J. Reißmann, S. Resag, W. Roethel, 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

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Abstract

The distribution of m(π+π-) in the decay η′ → π+π-γ has been measured with the Crystal Barrel detector. The results are based on a total of 7392 observed η′ decays. The box anomaly constant is extracted from this and its value is found to agree well with theoretical expectations. The pseudoscalar nonet parameters (f1, f8 and θPS) are determined. Finally, we find that there is a problem of consistency between QCD and the standard VDM assumption.

Original languageEnglish
Pages (from-to)195-206
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume402
Issue number1-2
DOIs
Publication statusPublished - Jun 5 1997

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., Brose, J., Bugg, D. V., Case, T., Cooper, A., Cramer, O., Crowe, K. M., Degener, T., ... Zou, B. S. (1997). Measurement of the decay distribution of η′ → π+π-γ and evidence for the box anomaly. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 402(1-2), 195-206. https://doi.org/10.1016/S0370-2693(97)00479-6