https://doi.org/10.1140/epja/i2006-10296-0
QNP 2006
The E687 cryptoexotic vector meson candidate
1
Centro Studi e Ricerche Enrico Fermi, Roma, Italy
2
Laboratori Nazionali di Frascati, INFN, Frascati, Italy
* e-mail: simone.pacetti@lnf.infn.it
Received:
22
December
2006
Accepted:
1
January
2007
Published online:
23
March
2007
A new study of the dip observed at 1.9GeV by the Fermilab experiment E687 in diffractive photoproduction of 3π +3π - is presented. The E687 and the BABAR data on the annihilation cross-section σ(e + e -→3π +3π -), obtained with initial-state radiation, are fitted all together. The fit function is based on a simple mixing mechanism that explains the manifestation of a resonance as a dip. Possible interpretations in terms of hybrids and tetraquark states are considered.
PACS: 13.40.Hq Electromagnetic decays – / 13.66.Bc Hadron production in e - e + interactions – / 25.20.Lj Photoproduction reactions –
© Società Italiana di Fisica and Springer-Verlag, 2007