arXiv subjects

G. Venanzoni

Publications and source records attributed to G. Venanzoni.

86 records · Page 5Linked to original sources

arXiv2008

Vus and lepton universality from kaon decays with the KLOE detector

KLOE has measured most decay branching ratios of Ks, Kl and K+/- mesons. It has also measured the Kl and the K+- lifetime and determined the shape of the form factors involved in kaon semileptonic decays. We present in the following a description of the above measurements and a well organized compendium of all of our data, with particular attention to correlations. These data provide the basis for the determination of the CKM parameter Vus and a test of the unitarity of the quark flavor mixing matrix. We also test lepton universality and place bounds on new physics using measurements of Vus from Kl2 and Kl3 decays.

hep-ex↗

arXiv2008

Measurement of the charged kaon lifetime with the KLOE detector

We have measured the charged kaon lifetime using a sample of 15 \times 10^6 tagged kaon decays. Charged kaons were produced in pairs at the DA\PhiNE ϕ-factory, e^+e^- \to ϕ\to K^+ K^-. The decay of a K^+ was tagged by the production of a K^- and viceversa. The lifetime was obtained, for both charges, from independent measurements of the decay time and decay lenght distributions. From fits to the four distributions we find τ= (12.347\pm0.030) ns.

hep-ex↗

arXiv2007

Precise measurements of the eta and the neutral kaon meson masses with the KLOE detector

We present precise measurements of the eta and K0 masses using the processes phi to eta gamma, eta to gamma gamma and phi to Ks Kl, Ks to pi+ pi-. The K0 mass measurement, M_K=497.583 +/- 0.005 (stat) +/- 0.020 (syst) MeV, is in acceptable agreement with the previous measurements but is more accurate. We find m(eta) = 547.874 +/- 0.007 (stat) +/- 0.031 (syst) MeV. Our value is the most accurate to date and is in agreement with two recent measurements based on eta decays, but is inconsistent, by about 10 sigma, with a measurement of comparable precision based on eta production at threshold.

hep-ex↗

arXiv2007

The physics case of DAFNE-2

We present the physics case of DAFNE-2, an $e^+e^-$ collider expected to deliver 20-50 fb$^{-1}$ at the $ϕ(1020)$ peak, and $\sim$ 5 fb$^{-1}$ in the energy region between 1 and 2.5 GeV.

hep-ex↗

arXiv2007

Measurement of the slope parameter αfor the η\to 3π^0 decay at KLOE

We report a preliminary measurement of the slope parameter $α$ for the $η\to 3\piz$ decay carried out with KLOE at DA$Φ$NE; where $α$ is the parameter describing the energy dependence of the square of the matrix element for this decay. By fitting the event density in the Dalitz plot with a collected statistic of 420 pb$^{-1}$ we determine $α= -0.027 \pm 0.004 (stat) ^{+0.004}_{-0.006} (syst)$. This result is consistent with current chiral perturbation theory calculations within the unitary approach.

hep-ex↗

arXiv2007

Determination of the η\toπ^+π^-π^0 Dalitz Plot slopes and asymmetries with the KLOE detector

We have studied, with the KLOE detector at the DA$Φ$NE $Φ$-Factory, the dynamics of the decay $η\toπ^+π^-π^0$ using data from the radiative $ϕ\toηγ$ decay for an integrated luminosity $L = 450 \textrm{pb^{-1}}$. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. This should allow to improve the knowledge of the decay amplitude which is sensitive to the u-d quark mass difference. We also present new best results on the C-violating asymmetries in the $η\toπ^+π^-π^0$ decay.

hep-ex↗

arXiv2007

Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE

We present results of a direct search for the decay KS --> e+e- with the KLOE detector, obtained with a sample of e+e- --> phi --> KSKL events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.3fb-1. The Standard Model prediction for this decay is BR(KS --> e+e-) = 1.6*10^-15. The search has been performed tagging the KS decays by simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic cuts and particle identification. At the end of the analysis chain we find BR(KS --> e+e-) < 2.1*10^-8 at 90% CL, which improves by a factor of ~7 on the previous best result, obtained by CPLEAR experiment.

hep-ex↗

arXiv2007

Charged kaon lifetime at KLOE

Preliminary result on the charged kaon lifetime, obtained by the KLOE experiment operating at DA$Φ$NE, the Frascati $ϕ$-factory, is presented

hep-ex↗

arXiv2007

Final state radiation and a possibility to test a pion-photon interaction model near two-pion threshold

Final state radiation in the process $e^+e^-\toπ^+π^-$ is considered for the cuts used in the analysis of KLOE data at large angles. By means of a Monte Carlo event generator FEVA, effects of non-pointlike behaviour of pions are estimated in the framework of Resonance Perturbation Theory. An additional complication related with the $ϕ$ meson intermediate state is taken into account and the corresponding contributions (the direct decay $ϕ\toπ^+π^-γ$ and the double resonance decay $ϕ\toρ^\pmπ^\mp\toπ^+π^-γ$) are added to FEVA. A method to test effects of non-pointlike behaviour of pions in a model-independent way is proposed.

hep-ph↗

arXiv2007

eta Physics and phi Radiative Decays at Kloe

Here we present KLOE results on the phi meson decays in pi0 pi0 gamma, pi+ pi- gamma and eta pi0 gamma, the measurement of the ratio Br(phi to eta' gamma)/Br(phi to eta gamma) with the estimate of the eta' gluonium content and the measurement of the eta mass.

hep-ex↗

arXiv2007

Prospects for e+e- physics at Frascati between the phi and the psi

We present a detailed study, done in the framework of the INFN 2006 Roadmap, of the prospects for e+e- physics at the Frascati National Laboratories. The physics case for an e+e- collider running at high luminosity at the phi resonance energy and also reaching a maximum center of mass energy of 2.5 GeV is discussed, together with the specific aspects of a very high luminosity tau-charm factory. Subjects connected to Kaon decay physics are not discussed here, being part of another INFN Roadmap working group. The significance of the project and the impact on INFN are also discussed. All the documentation related to the activities of the working group can be found in http://www.roma1.infn.it/people/bini/roadmap.html.

hep-ex↗

arXiv2006

Test of FSR in the process $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE and extraction of the pion form factor at threshold

Effects due to non-pointlike behaviour of pions in the process $e^+e^-\toπ^+π^-γ$ can arise for hard photons in the final state. By means of a Monte Carlo event generator, which also includes the contribution of the direct decay $ϕ\toπ^+π^-γ$, we estimate these effects in the framework of Resonance Perturbation Theory. We consider angular cuts used in the KLOE analysis of the pion form factor at threshold. A method to reveal the effects of non-pointlike behaviour of pions in a model-independent way is proposed.

hep-ph↗

arXiv2005

Test of FSR in the process $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE

In this paper we consider the possibility to test the FSR model in the reaction $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE. We propose to consider the low $Q^2$ region ($Q^2$ is the invariant mass squared of the di-pion system) to study the different models describing $gamma^*\toπ^+π^-γ$ interaction. As illustration we compare the scalar QED and Resonance Perturbation Theory prediction for the $e^+e^-\toπ^+π^-γ$ cross section. We also consider the contribution coming from the $ϕ$ direct decay ($ϕ\toπ^+π^-γ$). We find the low $Q^2$ region is sensitive to FSR models.

hep-ph↗

arXiv2000

Contribution of the direct decay $ϕ\toπ^+ π^- γ$ to the process $e^+ e^- \to π^+ π^- γ$ at DA$Φ$NE

The potential of DAPHNE to explore direct radiative decay $ϕ\to π^+ π^- γ$ is studied in detail. Predictions of different theoretical models for this decay are compared. We find that it should be possible to discriminate between these models at DAPHNE in one year, even assuming a relatively low luminosity ${\cal{L}} = 10^{31} {\rm cm}^{-2} {\rm sec^{-1}}$. The influence of the decay $ϕ\to π^+ π^- γ$ on the measurement of total cross section $σ(e^+e^- \to {\rm hadrons})$ by tagging a photon in the reaction $e^+e^- \to π^+π^- γ$ is also discussed.

hep-ph↗