MEASUREMENT OF THE PROTON ELECTROMAGNETIC FORM-FACTOR NEAR THRESHOLD IN THE TIME-LIKE REGION

Bardin, G; Burgun, G; Calabrese, R; Capon, G; Carlin, Roberto; Dalpiaz, P; Dalpiaz, Pf; Debrion, Jp; Derre, J; Dosselli, U; Duclos, J; Faure, Jl; Gasparini, Fabrizio; Huet, M; Kochowski, C; Limentani, Silvia; Luppi, E; Marel, G; Mazzucato, E; Meneguzzo, Anna Teresa; Pauli, E; Petrucci, F; Posocco, M; Savrie, M; Stroili, Roberto; Tecchio, L; Voci, Cesare; Zekri, N.

doi:10.1016/0370-2693(91)91157-Q

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.

Titolo:	MEASUREMENT OF THE PROTON ELECTROMAGNETIC FORM-FACTOR NEAR THRESHOLD IN THE TIME-LIKE REGION
Autori:	BARDIN G BURGUN G CALABRESE R CAPON G CARLIN, ROBERTO DALPIAZ P DALPIAZ PF DEBRION JP DERRE J DOSSELLI U DUCLOS J FAURE JL GASPARINI, FABRIZIO HUET M KOCHOWSKI C LIMENTANI, SILVIA LUPPI E MAREL G MAZZUCATO E MENEGUZZO, ANNA TERESA PAULI E PETRUCCI F POSOCCO M SAVRIE M STROILI, ROBERTO TECCHIO L VOCI, CESARE ZEKRI N. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1991
Rivista:	PHYSICS LETTERS. SECTION B
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.
Handle:	http://hdl.handle.net/11577/125654
Appare nelle tipologie:	01.01 - Articolo in rivista

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