Borri, Marcello
E+ E- Scattering
[1.0, 2.0]
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rivet Analysis
The first measurement of the neutron electromagnetic form factors in the timelike region.

Antonelli, A. ; Baldini, R. ; Benasi, P. ; et al.
Nucl.Phys.B 517 (1998) 3-35, 1998.
Inspire Record 471263 DOI 10.17182/hepdata.32681

The electromagnetic form factors of the neutron in the time-like region have been measured for the first time, from the threshold up to q 2 ⋟ 6 GeV 2 . The neutron magnetic form factor turns out to be larger than the proton one; the angular distribution suggests that for the neutron, at variance with the proton case, electric and magnetic form factors could be different. Further measurements are also reported, concerning the proton form factors and the Σ Σ production, together with the multihadronic cross section and the J / Γ branching ratio into n n .

3 data tables
Table 1

The uncertainty on the evaluated cross section is given by the quadratic combination of the following terms: the statistical uncertainty on the number of events, the statistical and systematic uncertainty on the luminosity (about 6PCT), the systematic uncertainty on the efficiency evaluation, dominated by the scanning efficiency contribution (about 15PCT). The SQRT(S) values with (C=NOMIN) and (C=SHIFT) correspond to the nominal energy and shifted energy analysis (see text of paper for details).

Table 2

The uncertainty on the evaluated cross section is given by the quadratic combination of the following terms: the statistical uncertainty on the number of events, the statistical and systematic uncertainty on the luminosity (about 6PCT), the systematic uncertainty on the efficiency evaluation, dominated by the scanning efficiency contribution (about 15PCT). The NEUTRON formfactor value are calculated in two hypotheses: GE = GM and GE = 0.

Table 3

The uncertainty on the evaluated cross section is given by the quadratic combination of the statistical and systematic uncertainties.


rivet Analysis
Measurement of the total e+ e- ---> hadrons cross-section near the e+ e- ---> N anti-N threshold

The FENICE collaboration Antonelli, A. ; Baldini, R. ; Bertani, M. ; et al.
Phys.Lett.B 365 (1996) 427-430, 1996.
Inspire Record 426675 DOI 10.17182/hepdata.37900

A new measurement of the total e + e − → hadrons cross-section in the centre of mass energy range 1.8-2.5 GeV, performed by the FENICE experiment at the Frascati e + e − storage ring ADONE, is presented. The behaviour of the total cross section together with the proton electromagnetic time-like form factor is discussed in terms of a narrow vector resonance close to the nucleon-antinucleon threshold.

1 data table
Table 1

Only statistical errors are quoted.


rivet Analysis
Measurement of the electromagnetic form-factor of the proton in the timelike region

Antonelli, A. ; Baldini, R. ; Bertani, M. ; et al.
Phys.Lett.B 334 (1994) 431-434, 1994.
Inspire Record 377833 DOI 10.17182/hepdata.28572

The cross section for the process e + e − → p p has been measured in the s range 3.6–5.9 GeV 2 by the FENICE experiment at the e + e − Adone storage ring and the proton electromagnetic form factor has been extracted.

2 data tables
Table 1

Cross section measurement.

Table 2

Proton form-factor measurement.