The s dependence of the proton form factor in the time-like region has been determined up to s = 4.2 GeV2, assuming the validity of the (G(e)) = (G(m)) = (G) hypothesis. Data were taken in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics on the proton form factor near threshold in the time-like region. Our results consist of cross section measurements of the pBARp --> e+e- reaction for different beam momenta in the kinematical range 3.6 less-than-or-equal-to s less-than-or-equal-to 4.2 GeV2. The observed s dependence of the form factor close to threshold differs appreciably from the one suggested by previous experiments.

PRECISE DETERMINATION OF THE ELECTROMAGNETIC FORM-FACTOR OF THE PROTON IN THE TIME-LIKE REGION UP TO S=4.2 GEV2

CALABRESE, Roberto;DALPIAZ, Pietro;FERRETTI, Paola;LUPPI, Eleonora;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
1991

Abstract

The s dependence of the proton form factor in the time-like region has been determined up to s = 4.2 GeV2, assuming the validity of the (G(e)) = (G(m)) = (G) hypothesis. Data were taken in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics on the proton form factor near threshold in the time-like region. Our results consist of cross section measurements of the pBARp --> e+e- reaction for different beam momenta in the kinematical range 3.6 less-than-or-equal-to s less-than-or-equal-to 4.2 GeV2. The observed s dependence of the form factor close to threshold differs appreciably from the one suggested by previous experiments.
1991
Bardin, G; Burgun, G; Calabrese, Roberto; Capon, G; Carlin, R; Dalpiaz, Pietro; Ferretti, Paola; Derre, J; Dosselli, U; Duclos, J; Faure, Jl; Gasparin...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516519
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