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ABSTRACT: Recent achievements and future plans at Frascati are reported: the first measurement of the Neutron time-like Form Factors at ADONE, the new high luminosity Factory DAE , the KLOE detector, a real factory for Chiral Dynamics in K decay, the measurement of 00 and +– cross sections at threshold and Quantum Mechanics paradoxes at DANE .
01/2006: pages 312-324;
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A. Antonelli, R. Baldini,
M. Bertani,
M. E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli,
R. Carlin, [......],
G. Puddu,
M. Reale,
L. Santi,
R. Santonico,
P. Satori,
M. Savrie,
S. Serci,
M. Spinetti,
S. Tessaro,
C. Voci
[show abstract]
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ABSTRACT: Preliminary results of experiment FENICE performed at Adone e
+
e
2212
storage ring in Frascati are presented here. The J/ braching ratios have been determined. At q
2 = 4.4GEV
2 a new measurement of the proton form factor has been perormed and at q
2 = 4.0 GeV
2 a first, preliminary value of the neutron form factor G
n
=(0.420.06) is obtained, assuming |G
E
| |G
M
|.
01/2006: pages 281-287;
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ABSTRACT: We use the available information on the ratio between the electric and magnetic proton form factors coming from recently published space-like data and from the few available time-like data. We apply a dispersive procedure on these data to evaluate the behaviour of this ratio, as a complex function, for all values of q^2.
08/2005;
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ABSTRACT: A practical strategy is presented and successfully implemented to determine form factors in the time-like but unphysical (below threshold) region using dispersion relations, in a model independent way without any bias towards expected resonances. Space and time-like data have been employed along with a regularization scheme to unfold and solve the integral equations. Remarkably, resonance structures with peaks for the $\rho(770)$, $\rho'(1600)$ and a structure near the $N\bar N$ threshold are automatically generated. The $\Phi$ peak is invisible thus refuting suggestions about any sizeable $s\bar s$ content in the nucleon. Comment: 4 pages, 8 figures, e^+e^- Physics at Intermediate Energies Workshop - Contribution T20
06/2001;
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ABSTRACT: The nucleon magnetic form factors in the unphysical region, i.e., for time-like but below the N threshold, have been obtained by means of dispersion relations in a model-independent way, without any bias towards expected
resonances. Space-like and time-like data have been employed, along with a regularization unfolding method to solve the integral
equation. Remarkably, resonance structures with peaks for the and and a structure near the threshold are automatically generated. The obtained has a much larger width, whose significance is explored. No evidence is found for a peak at the mass, in spite of the expectation that such a peak exists when there is a sizeable polarized s content in the vector current of the nucleon.
European Physical Journal C 11/1999; 11(4):709-715. · 3.63 Impact Factor
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The FENICE Collaboration,
A. Antonelli, R. Baldini,
M. Bertani,
M. E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli, [......],
L. Santi,
R. Santonico,
P. Sartori,
M. Savrié,
S. Serci,
M. T. Sergi,
M. Spinetti,
S. Tessaro,
C. Voci,
F. Zuin
[show abstract]
[hide abstract]
ABSTRACT: FENICE preliminary results on the measurement of the total cross-section for e+e− → hadrons and of the e+e− → 6π cross-section, in the centre-of-mass energy range 1.8–2.5 GeV, are reported.
Il Nuovo Cimento A 10/1994; 107(11):2383-2388.
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A. Antonelli, R. Baldini,
M. Bertani,
M. E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli,
R. Carlin, [......],
M. Reale,
L. Santi,
R. Santonico,
P. Sartori,
M. Savrie,
S. Serci,
M. T. Sergi,
M. Spinetti,
S. Tessaro,
C. Voci
[show abstract]
[hide abstract]
ABSTRACT: A new measurement of the branching ratio of J/ψ-->nn,
Bnn=(1.90+/-0.55)×10-3, has been achieved by
the FENICE detector at the e+e- storage ring ADONE
in Frascati.
Physics Letters B 02/1993; 301:317-320. · 3.95 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: A practical strategy is presented and successfully implemented to determine form factors in the time-like but unphysical (below threshold) region using dispersion relations, in a model independent way without any bias towards expected resonances. Space and time-like data have been employed along with a regularization scheme to unfold and solve the integral equations. Remarkably, resonance structures with peaks for the ϱ(770), ϱ′(1600) and a structure near the threshold are automatically generated. The Φ peak is invisible thus refuting suggestions about any sizeable content in the nucleon.
Nuclear Physics A.
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A. Antonelli, R. Baldini,
M. Bertani,
M.E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli,
R. Carlin, [......],
M. Reale,
L. Santi,
R. Santonico,
P. Sartori,
M. Savriè,
S. Serci,
M. Spinetti,
S. Tessaro,
C. Voci,
F. Zuin
[show abstract]
[hide abstract]
ABSTRACT: The cross section for the process has been measured in the s range 3.6–5.9 GeV2 by the FENICE experiment at the e+e− Adone storage ring and the proton electromagnetic form factor has been extracted.
Physics Letters B.
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A. Antonelli, R. Baldini,
P. Benasi,
M. Bertani,
M.E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli, [......],
M. Reale,
L. Santi,
R. Santonico,
P. Sartori,
M. Savrié,
S. Serci,
M. Spinetti,
S. Tessaro,
C. Voci,
F. Zuin
[show abstract]
[hide abstract]
ABSTRACT: The electromagnetic form factors of the neutron in the time-like region have been measured for the first time, from the threshold up to . 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 production, together with the multihadronic cross section and the J/Γ branching ratio into .
Nuclear Physics B.
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R Baldini,
M Bertani,
C Bini,
R Calabrese,
A De Falco,
M.L Ferrer,
P Gauzzi,
E Luppi,
A Masoni,
R Messi,
L Paoluzi,
E Pasqualucci,
M Posocco,
M Spinetti,
C Voci
[show abstract]
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ABSTRACT: The results of new measurements of and performed by the FENICE experiment are reported. The relative phase φ, between the strong and the electromagnetic decay amplitudes, is achieved from the branching ratios and from the nucleon form factors measurements near the J/ψ. It turns out φ=89o±15o, in agreement with other J/ψ decay amplitudes.
Physics Letters B.
-
A. Antonelli, R. Baldini,
M. Bertani,
M.E. Biagini,
V. Bidoli,
C. Bini,
T. Bressani,
R. Calabrese,
R. Cardarelli,
R. Carlin, [......],
M. Reale,
L. Santi,
R. Santonico,
P. Sartori,
M. Savrié,
S. Serci,
M. Spinetti,
S. Tessaro,
C. Voci,
F. Zuin
[show abstract]
[hide abstract]
ABSTRACT: 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.
Physics Letters B.
-
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A Antonelli, R Baldini,
M. Bertani,
M.E. Biagini,
V Bidoli,
C. Bini,
Tullio Bressani,
R Calabrese,
R. Cardarelli,
R Carlin, [......],
M Reale,
L Santi,
R Santonico,
P Sartori,
M Savrié,
S. Serci,
M Spinetti,
S Tessaro,
C Voci,
F Zuin
