Abstract
Motivated by nearly unanimous claim that the observed mass spectrum η′ → π+π-γ is not that expected from pure ρ0 dominance, we reanalyze all the published data on η/η′ → π+π-γ decays. We find non-resonant contributions. In order to evaluate precisely the magnitude of these terms, we also refit the e+e- → π+π- data to get reliably the ρ0 parameters and decay amplitude. We show that identifying the non-resonant contribution with the box anomaly predicted by QCD and chiral theories, one achieves a consistent picture. Several checks are performed which show the consistency of our fitted parameters. From four measurements, we determinef 1,f 8 and θPS on purely experimental grounds, and we find them in the expected range. Presently available data allow for two solutions, one is consistent with QCD, the other favours integral charge quark models. We show that presently available data do not allow to choose among these two solutions. We discuss the interrelation of uncertainties in e+e- → π+π- physics with our two solutions.
Similar content being viewed by others
References
M.S. Chanowitz: Phys. Rev. Lett. 35 (1975) 977
M.S. Chanowitz: Phys. Rev. Lett. 44 (1980) 59
M.S. Chanowitz: in: Proceedings of the VIth International Workshop on Photon-Photon Collisions 1984, R.L. Lander (ed.). Singapore, World Scientific 1985
J. Wess, B. Zumino: Phys. Lett. B37 (1971) 95
L. Adler: Phys. Rev. 117 (1969) 2426; J.S. Bell, R. Jackiw: Nuovo Cimento A60 (1969) 47
J.F. Donoghue, B.R. Holstein, Y.R. Lin: Phys. Rev. Lett. 55 (1985) 2766
J. Gasser, H. Leutwyler: Nucl. Phys. B250 (1985) 465
F.J. Gilman, R. Kauffman: Phys. Rev. D36 (1987) 2761
M. Gormley et al.: Phys. Rev. D2 (1970) 501
J.G. Layter et al.: Phys. Rev. D7 (1973) 2565
Review of particle properties: Phys. Lett. B 239 (1990)
S.M. Jacobs et al.: Phys. Rev. D8 (1973) 18
J.S. Dansburg et al.: Phys. Rev. D8 (1973) 3744
A. Grigorian et al.: Nucl. Phys. B91 (1975) 232
[JADE Coll.], L.W. Bartel et al.: Phys. Lett. B113 (1982) 190
[CELLO Coll.], H.J. Behrend et al.: Phys. Lett. B114 (1982) 78
[PLUTO Coll.], Ch. Berger et al.: Phys. Lett. B142 (1984) 125
[TASSO Coll.], M. Althoff et al.: Phys. Lett. B147 (1984) 487
[MARK II Coll.], G. Gidal et al.: in: “Multiparticle Dynamics 1985”, Proceedings of the XVI International Symposium at Kiryat Anavim (Israel), J. Grunhaus (ed.). Gif sur Yvette: Editions Frontières 1987
[TPC/γγ Coll.], H. Aihara et al.: Phys. Rev. D35 (1987) 2650
[ARGUS Coll.], H. Albrecht et al.: Phys. Lett. B199 (1987) 457
[MARK II Coll.], F. Butler et al.: Phys. Rev. D42 (1990) 1368
[Lepton F Coll.], S.I. Bityukov et al.: Z. Phys. C50 (1991) 451
M. Feindt: Desy preprint PLUTO-84-03, Hamburg 1984
F. Butler: LBL preprint 26465, Berkeley 1990
J.H. Peters: Desy preprint FCE-90-01, Hamburg 1990
K.W. McLean: Desy preprint F15-90-03, Hamburg 1990
[WA76 Coll.], T.A. Armstrong et al.: Z. Phys. C54 (1992) 371
V.I. Ogievetsky et al.: Phys. Lett. B35 (1971) 69
J.D. Jackson: Nuovo Cimento XXXIV (1964) 1644
J. Pisut, M. Roos: Nucl. Phys. B6 (1968) 325
Yu.M. Antipov et al.: Sov. J. Nucl. Phys. 45 (1987) 645
Yu. M. Antipov et al.: Z. Phys. C42 (1989) 185
[MARK III Coll.] D. Coffman et al.: SLAC-PUB-5669, Stanford 1991
[NEW MUON Coll.] P. Amaudruz et al.: CERN-PPE/91-228, Geneva 1991
J. Ballam et al.: Phys. Rev. D5 (1972) 545
E. Kogan et al.: Nucl. Phys. B122 (1977) 383
K. Abe et al.: Phys. Rev. D32 (1985) 2288
V. Chabaud et al.: Nucl. Phys. B223 (1983) 1
E. Byckling, K. Kajantie: Particle kinematics. London: John Wiley 1973
G.F. Chew:S-matrix theory of strong interactions. New York: WA. Benjamin 1962
G. Grayer et al.: Nucl. Phys. B75 (1974) 189
H. Becker et al.: Nucl. Phys. B151 (1979) 46
W. Dunwoodie et al.: in: Proceedings of the Joint International Lepton-Photon symposium and Europhysics Conference in High Energy Physics, Geneva 1991, vol. 1, p. 84. S. Hegarty, K. Potter, E. Quercigh (eds.). Singapore: World Scientific 1992
J.P. Perez-Y-Jorba, F.M. Renard: Phys. Rep. 31 (1977) 1
R.P. Feynman: Photon-hadron interactions. Reading: W.A. Benjamin 1972
D. Benaksas et al.: Phys. Lett. B39 (1972) 289
G.J. Gounaris, J.J. Sakurai: Phys. Rev. Lett. 21 (1968) 244
A. Quenzer et al.: Phys. Lett. B76 (1978) 512
L.M. Barkov et al.: Nucl. Phys. B256 (1985) 365
Z.Y. Fang, G. Lopez Castro, J. Pestiau: Nuovo Cimento 100A (1988) 155
J.H. Kühn, A. Santamaria: Z. Phys. C48 (1990) 445
D. Bisello et al.: Phys. Lett. B220 (1989) 321
G.P. Lepage, S.J. Brodsky: Phys. Rev. D22 (1980) 2157
V.L. Chernyak, A.R. Zhitnitsky: Phys. Rep. 112 (1984) 173
M. Bando, T. Kugo, S. Uehara, K. Yamawaki, T. Yanagida: Phys. Rev. Lett. 54 (1985) 1215
S. Kawabata: in: Proceedings of the Joint International Lepton-Photon symposium and Europhysics Conference on High Energy Physics, Geneva 1991, vol. 2, p. 53. S. Hegarty, K. Potter, E. Quereigh (eds.). Singapore: World Scientific 1992
M.Y. Han, Y. Nambu: Phys. Rev. 139 (1965) B1006
A. de Rujula, R. giles, R. Jaffe: Phys. Rev. D17 (1978) 285
B.C. Pearce in: Proceedings of the Joint International Lepton-Photon symposium and Europhysics Conference on High Energy Physics, Geneva 1991, vol. 1, p. 77. S. Hegarty, K. Potter, E. Quercigh (eds.). Singapore: World Scientific 1992
A. Bäcker: in: Proceedings of the VIIth Workshop on photon-photon collisions, Paris 1986, p. 101: Singapore: World Scientific 1986
P. Aurenche: in: Proceedings of the VIIth Workshop on photon-photon collisions, Paris 1986, p. 218. Singapore: World Scientific 1986
J.C. Pati, A. Salam: Phys. Rev. D8 (1973) 1240
R.M. Godbole et al.: Phys. Lett. B142 (1984) 91
D.E. Andrews et al.: Phys. Rev. Lett. 38 (1977) 198
S.I. Dolinsky et al.: Z. Phys. C42 (1989) 511
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Benayoun, M., Feindt, M., Girone, M. et al. Experimental evidence for the box anomaly inη/η′ decays and the electric charge of quarks. Z. Phys. C - Particles and Fields 58, 31–53 (1993). https://doi.org/10.1007/BF01554078
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01554078