Showing papers by "Ludovico Pontecorvo published in 2007"
TL;DR: In this article, the authors measured the ratio R ϕ = BR ( ϕ → η ′ γ ) / BR (ϕ → π − 7 γ and 7γ, respectively, in a sample of ∼ 1.4 × 10 9 ϕ mesons produced at the Frascati ϕ factory.
98 citations
TL;DR: In this paper, the authors studied the Dalitz plot of the e+e-→π0π0γ events (Nπ 0π 0γ∼65000) collected at \(\sqrt{s} \simeq{M}_{\phi}\) with the KLOE detector.
Abstract: We have studied the Dalitz plot of the e+e-→π0π0γ events (Nπ0π0γ∼65000) collected at \(\sqrt{s} \simeq{M}_{\phi}\) with the KLOE detector. In the dipion invariant mass (Mππ) region below 700 MeV, the process under study is dominated by the non-resonant process e+e-→ωπ0 with ω→π0γ whereas, for higher Mππ values, the radiative φ decay to the f0(980) is the dominant mechanism. Different theoretical models are used to fit the Dalitz plot, taking also into account a possible contribution of the σ(600). For each model, we extract the f0(980) mass and its coupling to ππ, KK and to the φ.
52 citations
01 May 2007
TL;DR: In this article, the results of CPLEAR obtained by studying the time evolution of single and two entangled kaons are reviewed, and new or improved limits on decoherence and CPT violation parameters have been obtained by KLOE studying the quantum interference in the channel ϕ → K S K L → π + π − π+ π− π-π+π−π−π−π −π−δ−π+δ+π −.
Abstract: Neutral kaons provide one of the systems most sensitive to quantum mechanics and CPT violation. Models predicting quantum mechanics violation, also related to CPT violation, have been tested at the CPLEAR and KLOE experiments. In this report results of CPLEAR obtained by studying the time evolution of single and two entangled kaons are reviewed. New or improved limits on decoherence and CPT violation parameters have been obtained by KLOE studying the quantum interference in the channel ϕ → K S K L → π + π − π + π − . No deviations from the expectations of quantum mechanics and CPT symmetry have been observed.
TL;DR: The KLOE experiment at the e+e-collider DAΦNE in Frascati as discussed by the authors collected 2.5 fb-1 at the peak of the ϕ resonance, and 250 pb1 at $\sqrt{s}=1~{\rm GeV}$.
Abstract: The KLOE experiment has finished its data taking at the e+e- collider DAΦNE in Frascati. KLOE has collected 2.5 fb-1 at the peak of the ϕ resonance, and 250 pb-1 at $\sqrt{s}=1~{\rm GeV}$. The latest experimental results based on a sample of 450 pb-1 are presented in this paper: they mainly concern the neutral and charged kaon decays, and the radiative ϕ decays into scalar and pseudoscalar mesons.