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Measurement of the Photoproduction Phases of the rho, omega, and phi Mesons

Bartalucci, S. ; Bertolucci, S. ; Bienlein, J.K. ; et al.
Nuovo Cim.A 44 (1978) 587, 1978.
Inspire Record 120711 DOI 10.17182/hepdata.37585

We measured 30 000 wide-angle electron-positron pairs from the reaction γ+p→p+e++e− in the invariant-mass region 500≤m≤1060 MeV. The photoproduction amplitudes of the ρ, ω and ϕ mesons were measured to deviate from being pure imaginary by 37.5°−3.1°+2.8°, 29.6°−12.9°+15.5°, 3.4°−4.2°+5.3°,respectively.

1 data table
Table 1

DEVIATION OF VECTOR MESON PHOTOPRODUCTION PHASES FROM PURE IMAGINARY.