Paolo Franzini

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Beginning in 2004, much progress has been made towards the determination of |Vus| using new measurements of branching ratios, lifetimes and form factor parameters in semileptonic kaon decays. My discussion here concentrates on some presently unsatisfactory aspects about these measurements, especially the attempts to determine strongly correlated parameters(More)
Investigation at a φ–factory can shed light on several debated issues in particle physics. We discuss: i) recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled kaon states, iii)(More)
Data collected by the KLOE experiment in years 2001/2002 for a total integrated luminosity of 410 pb−1, corresponding to 17 million of produced η’s from the Φ → ηγ radiative decay, have been analyzed to look for the C-violating decay η → γγγ. The signal is searched in events with 4 photons in the final state by using the spectrum of the most energetic(More)
CP violation in the K system is pedagogically reviewed. We discuss its manifestations in the neutral K meson systems, in rare K meson decays and in decays of charged K mesons. Results from classical experiments, and perspectives for upcoming experiments are included. We also briefly discuss the possibility of CPT tests. PACS: 11.30.Er; 13.20.Jf; 29.30.Gx;(More)
D. Babusci h, D. Badoni r,s, I. Balwierz-Pytko g, G. Bencivenni h, C. Bini p,q, C. Bloise h, F. Bossi h, P. Branchini u, A. Budano t,u, L. Caldeira Balkeståhl w, G. Capon h, F. Ceradini t,u, P. Ciambrone h, E. Czerwiński g, E. Danè h, E. De Lucia h, G. De Robertis b, A. De Santis p,q, A. Di Domenico p,q, C. Di Donato l,m, R. Di Salvo s, D. Domenici h, O.(More)
In the fixed energy environment of the ee collider DAΦNE, KLOE can measure the cross section of the process ee → hadrons as a function of the hadronic system energy using the radiative return method. At energies below 1 GeV, ee → ρ → ππ is the dominating hadronic process. We report here on the status of the analysis of the process ee → ππγ. Some preliminary(More)
We present the first observation of quantum interference in the process φ → KSKL→ π+π−π+π−. This analysis is based on data collected with the KLOE detector at the e+e− collider DAΦNE in 2001–2002 for an integrated luminosity of about 380 pb. Fits to the distribution of ∆t, the difference between the two kaon decay times, allow tests of the validity of(More)
D. Babusci h, D. Badoni r,s, I. Balwierz-Pytko g, G. Bencivenni h, C. Bini p,q, C. Bloise h, F. Bossi h, P. Branchini u, A. Budano t,u, L. Caldeira Balkeståhl w, G. Capon h, F. Ceradini t,u, P. Ciambrone h, F. Curciarello j,f, E. Czerwiński h, E. Dané h, V. De Leo j,f, E. De Lucia h, G. De Robertis b, A. De Santis p,q, P. De Simone h, A. Di Domenico p,q, C.(More)
We have searched for the C-violating decay η → γγγ in a sample of ∼18 million η mesons produced in φ → ηγ decays, collected with the KLOE detector at the Frascati φ-factory DAΦNE. No signal is observed and we obtain the upper limit BR(η → γγγ) ≤ 1.6 × 10 at 90% CL. The decay η→γγγ is forbidden by charge-conjugation invariance, if the weak interaction is(More)
We have measured the cross section σ(e+e−→π+π−γ) with the KLOE detector at DAΦNE, at an energy W = Mφ = 1.02 GeV. From the dependence of the cross section on m(ππ) = √ W 2 − 2WEγ , where Eγ is the energy of the photon radiated from the initial state, we extract σ(e+e−→π+π−) for the mass range 0.35 < m(ππ) < 0.95 GeV. From our result we extract the pion form(More)