The s dependence of the electromagnetic proton form factors in the time-like region has been determined from the threshold (s = 4M(p)2) up to s = 4.2 GeV2. Data were collected in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics. Total and differential cross section of the ppBAR --> e-e+ reaction have been measured. The electric and magnetic form factors are found to have comparable value. The observed form factor shows a clear steep s dependence close to the threshold.
DETERMINATION OF THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE PROTON IN THE TIME-LIKE REGION
CARLIN, ROBERTO;GASPARINI, FABRIZIO;LIMENTANI, SILVIA;MENEGUZZO, ANNA TERESA;STROILI, ROBERTO;VOCI, CESARE;
1994
Abstract
The s dependence of the electromagnetic proton form factors in the time-like region has been determined from the threshold (s = 4M(p)2) up to s = 4.2 GeV2. Data were collected in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics. Total and differential cross section of the ppBAR --> e-e+ reaction have been measured. The electric and magnetic form factors are found to have comparable value. The observed form factor shows a clear steep s dependence close to the threshold.File in questo prodotto:
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