The FENICE detector at ADONE

Antonelli, A.; Ferroli, R. Baldini; Bertani, M.; Biagini, M.E.; Bidoli, V.; Bini, C.; Bressani, T.; Calabrese, R.; Cardarelli, R.; Carlin, R.; Casari, C.; Cugusi, Lucia; Simone, S.; Zorzi, G. De; Feliciello, A.; Ferrer, M. L.; Dalpiaz, P.; Guiducci, S.; Iazzi, F.; Luppi, E.; Marcello, S.; Masoni, A.; Minetti, B.; Morandin, M.; Paoluzi, L.; Pauli, G.; Petrucci, F.; Posocco, M.; Preger, M.; Puddu, G.; Santi, L.; Santonico, R.; Sartori, P.; Savrié, M.; Serci, S.; Spinetti, M.; Tecchio, L.; Voci, C.

doi:10.1109/nssmic.1991.258950

Cited by 10 publications

(25 citation statements)

References 7 publications

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“…Since the three-gluon contribution is flavour-blind any difference between the decay widths into pp and nn must be due to the electromagnetic contribution. From experiment it is known that the widths for J/ψ → pp and J/ψ → nn agree within the experimental errors [41] and that the time-like form factors for the proton and the neutron, to which the B em are directly proportional, are approximately equal in modulus at s = 5.4 GeV 2 [42]. Since both the contributions, B 3g and B em , are in general complex numbers with non-trivial phases the only conclusion to be drawn at present is that the relative phase between B 3g and B em is the same (up to an eventual sign) for the proton and the neutron channel.…”

Section: A Model For the Nucleon Wave Functionmentioning

confidence: 62%

Modelling the nucleon wave function from soft and hard processes

Bolz¹,

Kroll²

1996

Z. Physik A - Hadrons and Nuclei

102

187

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Current light-cone wave functions for the nucleon are unsatisfactory since they are in conflict with the data of the nucleon's Dirac form factor at large momentum transfer. Therefore, we attempt a determination of a new wave function respecting theoretical ideas on its parameterization and satisfying the following constraints: It should provide a soft Feynman contribution to the proton's form factor in agreement with data; it should be consistent with current parameterizations of the valence quark distribution functions and lastly it should provide an acceptable value for the J/ψ → NN decay width. The latter process is calculated within the modified perturbative approach to hard exclusive reactions. A simultaneous fit to the three sets of data leads to a wave function whose x-dependent part, the distribution amplitude, shows the same type of asymmetry as those distribution amplitudes constrained by QCD sum rules. The asymmetry is however much more moderate as in those amplitudes. Our distribution amplitude resembles the asymptotic one in shape but the position of the maximum is somewhat shifted.

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Section: A Model For the Nucleon Wave Functionmentioning

confidence: 62%

Modelling the nucleon wave function from soft and hard processes

Bolz¹,

Kroll²

1996

Z. Physik A - Hadrons and Nuclei

102

187

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“…Production of six pions in e + e − annihilation, studied at DM2 [1,2,3], showed a "dip" in the cross section at about 1.9 GeV, confirmed later by the Fermilab E687 experiment in photoproduction [4,5], and with a much larger effective integrated luminosity at BaBar [6] using initial-state radiation (ISR). Even earlier, a narrow structure near the proton-antiproton threshold was also observed in the total cross section of e + e − annihilation into hadrons in the FENICE experiment [7]. A measurement of the CMD-3 Collaboration [8] confirmed these observations and demonstrated that the drop in the e + e − → 3(π + π − ) cross section occurred in the narrow energy range of less than 10 MeV width.…”

Section: Introductionmentioning

confidence: 70%

Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

et al. 2019

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“…Information on the production of baryons is scarce. Measurements by DM1 [89], DM2 [90] and FENICE [91] showed that the cross section is small. However, it should be taken into account if R is determined inclusively.…”

Section: The E + E − Data and The Origin Of Systematic Errorsmentioning

confidence: 93%

Hadronic contributions to (g?2) of the leptons and to the effective fine structure constant ?(M Z 2 )

Eidelman

Jegerlehner

1995

Z. Phys. C - Particles and Fields

493

701

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The new experiment planned at Brookhaven to measure the anomalous magnetic moment of the muon a µ ≡ (g µ − 2)/2 will improve the present accuracy of 7 ppm by about a factor of 20. This requires a careful reconsideration of the theoretical uncertainties of the g −2 predictions, which are dominated by the error of the contribution from the light quarks to the photon vacuum polarization. This issue is crucial also for the precise determination of the running fine structure constant at the Z-peak as LEP/SLC experiments continue to increase their precision. In this paper we present an updated analysis of the hadronic vacuum polarization using all presently available e + e − data. This seems to be justified because previous work on the subject was based to some extent on preliminary or incomplete experimental data. Contributions from different energy ranges are presented separately for g −2 of the muon and the τ -lepton and for α(M 2 Z ). We obtain the results a had * µ = (725±16)×10 −10 and a had * τ = (351 ± 10) × 10 −8 , where the asterisk indicates the dressed (renormalization group improved) value. For the effective fine structure constant at M Z = 91.1888 GeV we obtain ∆α (5) had = 0.0280 ± 0.0007 and α(M 2 Z ) −1 = 128.896 ± 0.090. Further improvement in the accuracy of theoretical predictions which depend on the hadronic vacuum polarization requires more precise measurements of e + e − cross-sections at energies below about 12 GeV in future experiments.

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The FENICE detector at ADONE

Cited by 10 publications

References 7 publications

Modelling the nucleon wave function from soft and hard processes

Modelling the nucleon wave function from soft and hard processes

Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Hadronic contributions to (g?2) of the leptons and to the effective fine structure constant ?(M Z 2 )

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The FENICE detector at ADONE

Cited by 10 publications

References 7 publications

Modelling the nucleon wave function from soft and hard processes

Modelling the nucleon wave function from soft and hard processes

Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Hadronic contributions to (g?2) of the leptons and to the effective fine structure constant ?(M Z 2 )

Contact Info

Product

Resources

About

Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold