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

被引：50

作者：

BARDIN, G

BURGUN, G

CALABRESE, R

CAPON, G

CARLIN, R

DALPIAZ, P

DALPIAZ, PF

DEBRION, JP

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] IST NAZL FIS NUCL,I-00044 FRASCATI,ITALY

[2] UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY

[3] IST NAZL FIS NUCL,I-44100 FERRARA,ITALY

[4] CENS,DEPT PHYS PARTICULAIRES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE

[5] LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY

[6] IST NAZL FIS NUCL,I-35131 PADUA,ITALY

[7] UNIV FERRARA,DIPARTMENTO FIS,I-44100 FERRARA,ITALY

[8] IST NAZL FIS NUCL,I-10125 TURIN,ITALY

[9] UNIV TURIN,IST FIS SUPER,I-10125 TURIN,ITALY

来源：

PHYSICS LETTERS B | 1991年 / 255卷 / 01期

关键词：

D O I：

10.1016/0370-2693(91)91157-Q

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The rate of the reaction pBARp --> 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 \G(e)\ = \G(m)\ 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.

引用

页码：149 / 154

页数：6

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