Summary
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° +2.8°−3.1° , 29.6° +15.5°−12.9° , 3.4° +5.3°−4.2° ,respectively.
Riassunto
Si sono misurate 30 000 coppie elettrone-positrone con massa invariante compresa fra 500 e 1060 MeV, studiando la reazione γp→pe+e−. Le ampiezze di fotoproduzione dei mesoni vettoriali ρ, ω e ϕ sono state misurate deviare da ampiezza pure immaginarie di un valore pari a 37.5° +2.8°−3.1° , 29.6° +15.5°−12.9° e 3.4° +5.3°−4.2° rispettivamente.
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Bartalucci, S., Basini, C., Bertolucci, S. et al. Measurement of the photoproduction phases of the ρ, ω and ϕ mesons. Nuov Cim A 44, 587–598 (1978). https://doi.org/10.1007/BF02896342
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DOI: https://doi.org/10.1007/BF02896342