First measurement of the neutron electromagnetic form factor in the time-like region

Antonelli, A.; Baldini, R.; Bertani, M.; Biagini, M.E.; Bidoli, V.; Bini, C.; Bressani, T.; Calabrese, R.; Cardarelli, R.; Carlin, R.; Casari, C.; Cugusi, Lucia; Dalpiaz, P.; Zorzi, G. De; Feliciello, A.; Ferrer, M. L.; Ferretti, Paola; Gauzzi, P.; Gianotti, P.; Iazzi, F.; Luppi, E.; Marcello, S.; Masoni, A.; Messi, R.; Morandin, M.; Paoluzi, L.; Pauli, G.; Petrucci, F.; Posocco, M.; Preger, M.; Puddu, G.; Reale, M.; Santi, L.; Santonico, R.; Sartori, P.; Savrié, M.; Serci, S.; Spinetti, M.; Tessaro, S.; Voci, C.

doi:10.1016/0370-2693(93)91225-c

Cited by 42 publications

(36 citation statements)

References 25 publications

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“…The fit gives σ = 0.1 ± 0.2 nb below and σ = 0.8 ± 0.2 nb above the nn threshold. Our result agrees with FENICE measurement [11]. The quoted errors are statistical.…”

Section: E + E − → Pp Nnsupporting

confidence: 82%

Recent results from SND experiment at VEPP-2000 collider

Ачасов

Aulchenko²,

Barnyakov³

et al. 2012

EPJ Web of Conferences

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“…The fit gives σ = 0.1 ± 0.2 nb below and σ = 0.8 ± 0.2 nb above the nn threshold. Our result agrees with FENICE measurement [11]. The quoted errors are statistical.…”

Section: E + E − → Pp Nnsupporting

confidence: 82%

Recent results from SND experiment at VEPP-2000 collider

Ачасов

Aulchenko²,

Barnyakov³

et al. 2012

EPJ Web of Conferences

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“…Using Eqs. (7,8), they can in principle be constructed from experimental data. In practice, this program can only be carried out for the lightest two-particle intermediate states.…”

Section: B Dispersion Relations and Spectral Decompositionmentioning

confidence: 99%

“…Due to the difficulty of the experiments, the time-like form factors are less well known. While there is a fair amount of information on the proton time-like form factors [6,7], only one measurement of the neutron form factor from the pioneering FENICE experiment [8,9] exists. Recently, new precise data on the proton time-like form factors have been presented by the BES, CLEO, and BABAR collaborations [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Dispersion analysis of the nucleon form factors including meson continua

2007

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Dispersion relations provide a powerful tool to analyse the electromagnetic form factors of the nucleon for all momentum transfers. Constraints from meson-nucleon scattering data, unitarity, and perturbative QCD can be included in a straightforward way. In particular, we include the 2pi, rho-pi, and KKbar continua as independent input in our analysis and provide an error band for our results. Moreover, we discuss two different methods to include the asymptotic constraints from perturbative QCD. We simultaneously analyze the world data for all four form factors in both the space-like and time-like regions and generally find good agreement with the data. We also extract the nucleon radii and the omega-NN coupling constants. For the radii, we generally find good agreement with other determinations with the exception of the electric charge radius of the proton which comes out smaller. The omega-NN vector coupling constant is determined relatively well by the fits, but for the tensor coupling constant even the sign can not be determined.Comment: 24 pages, 9 figure

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“…The technical correctness of the implementation was checked first by confronting the Q 2 distribution of events [24,26] e + e − → nn cross section with the model from Ref. [18].…”

Section: Nucleon Form Factors and Their Implementation In Phokharamentioning

confidence: 99%

Nucleon form factors, B-meson factories and the radiative return

et al. 2004

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Abstract. The feasibility of a measurement of the electric and magnetic nucleon form factors at B-meson factories through the radiative return is studied. Angular distributions allow a separation of the contributions from the two form factors. The distributions are presented for the laboratory and the hadronic rest frame, and the advantages of different coordinate systems are investigated. It is demonstrated that Q 2 values up to 8 or even 9 GeV 2 are within reach. The Monte Carlo event generator PHOKHARA is extended to nucleon final states, and results are presented which include Next-to-Leading Order radiative corrections from initial-state radiation. The impact of angular cuts on rates and distributions is investigated and the relative importance of radiative corrections is analysed.

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First measurement of the neutron electromagnetic form factor in the time-like region

Cited by 42 publications

References 25 publications

Recent results from SND experiment at VEPP-2000 collider

Recent results from SND experiment at VEPP-2000 collider

Dispersion analysis of the nucleon form factors including meson continua

Nucleon form factors, B-meson factories and the radiative return

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