V. Valente

Experimental results on a search for narrow resonances in e+e- annihilation into hadrons in the mass region 2520–2990 MeV

Abstract A search for possible new resonances produced in e + e - annihilation at Adone has been performed in the mass region 2520–2990 MeV. No evidence has been found for new resonances. We obtain an upper limit on the energy integrated resonant cross section of about 6% of the J/ψ (3100) corresponding value.

Search for narrow resonances in e+e− annihilation into hadrons in the mass regions 1910–2545 MeV and 2970–3090 MeV

Abstract We have searched for possible narrow resonances produced in e + e − annihilation at Adone, in the mass regions 1910–2545 MeV and 2970–3090 MeV. No evidence has been found for narrow resonances, within the sensitivity of the present work: we deduce an upper limit on the energy integrated resonant cross section of about 10% of the J/ψ(3100) corresponding value.

Multihadronic decays and partial widths of the J/Ψ (3100) resonance produced in e+e− annihilation at adone

Abstract The reactions e+e−→ hadrons and e+e+e−→e+e− have been studied at the J/gY (3100) resonance). The relative weights of the topological cross sections for fixed charged multiplicity are σ2=(32±5)%, σ4=(49±8)%, σ6=(18±3)%, and σ8=(1±0.6)%. The average pion multiplicities are 〈nch〉=3.8±0.3 and 〈nπo〉=3.1±0.8. The decay widths are Γe=(4.6±0.8) keV, Γh=(59±24) keV, and Γ=(68±26) keV.

Experimental results on photon-photon interactions at adone

Abstract Experimental results for the reactions e + e − → e + e − + X are presented for X = e + e − , μ + μ − , π + π − , ″. A tagging technique has been used to detect final electrons and positrons. A QED test is performed and an upper limit of 20 keV is derived for the partial width Γ ( η ′ → γγ ).

Electron-positron bremsstrahlung at ADONE. A new limit for the existence of a heavy electron

Abstract A new measurement of the cross section for the reaction e+e− → e+e− γ has been performed at the ADONE storage ring, using a wide angle electromagnetic detector together with tagging counters for detecting small-angle electrons. The results are in agreement with the QED predictons. New limits for the mass and coupling constant (e∗, eγ) of a heavy electron, e∗, have been established.

Search for the radiative η′(958)+γ decay of the J/Ψ (3100) resonance produced in e+e− annihilation

Abstract The decay J/ Ψ (3100)→ η (958) + γ has been searched for at tthe Adone e + e +- storage ring. No candidate event has been found. This allows to set an upper limit of 1.0 keV (90% C.L.) for this decay partial width.