DETERMINATION OF THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE PROTON IN THE TIME-LIKE REGION

被引:158
作者
BARDIN, G
BURGUN, G
CALABRESE, R
CAPON, G
CARLIN, R
DALPIAZ, P
DALPIAZ, PF
DERRE, J
DOSSELLI, U
DUCLOS, J
FAURE, JL
GASPARINI, F
HUET, M
KOCHOWSKI, C
LIMENTANI, S
LUPPI, E
MAREL, G
MAZZUCATO, E
MENEGUZZO, A
PAULI, E
PETRUCCI, F
POSOCCO, M
SAVRIE, M
STROILI, R
TECCHIO, L
VOCI, C
ZEKRI, N
机构
[1] UNIV FLORENCE,DIPARTIMENTO FIS,I-50121 FLORENCE,ITALY
[2] IST NAZL FIS NUCL FERRARA,I-44100 FERRARA,ITALY
[3] INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY
[4] UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY
[5] IST NAZL FIS NUCL PADOVA,I-35131 PADUA,ITALY
[6] UNIV TURIN,IST FIS SUPER,I-10125 TURIN,ITALY
[7] IST NAZL FIS NUCL TORINO,I-10125 TURIN,ITALY
关键词
D O I
10.1016/0550-3213(94)90052-3
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
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.
引用
收藏
页码:3 / 32
页数:30
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