The rate of the reaction anti-p p to e+e- has been measured in liquid hydrogen for antiprotons at momentum values between 150 and 300 MeV/c. New precise values of the proton electromagnetic form factor in the time-like region have been obtained assuming |Ge|=|Gm| in the investigated region. The q2 dependence of the form factor close to threshold is found to have a steeper slope than indicated by existing calculations based on vector dominance models.
MEASUREMENT OF THE PROTON ELECTROMAGNETIC FORM-FACTOR NEAR THRESHOLD IN THE TIME-LIKE REGION
CARLIN, ROBERTO;GASPARINI, FABRIZIO;LIMENTANI, SILVIA;MENEGUZZO, ANNA TERESA;STROILI, ROBERTO;VOCI, CESARE;
1991
Abstract
The rate of the reaction anti-p p to e+e- has been measured in liquid hydrogen for antiprotons at momentum values between 150 and 300 MeV/c. New precise values of the proton electromagnetic form factor in the time-like region have been obtained assuming |Ge|=|Gm| in the investigated region. The q2 dependence of the form factor close to threshold is found to have a steeper slope than indicated by existing calculations based on vector dominance models.
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