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Register a new userLow energy kaon-nuclei interaction studies through the Sigma^0pi^0 channel with the KLOE detector
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The AMADEUS experiment aims to perform precision studies in the sector of low-energy kaon-nuclei interaction at the DAPhi NE collider at LNF-INFN, implementing a dedicated setup in the central region of the KLOE detector. As a first step towards the AMADEUS realization the existing KLOE data (runs from 2002 to 2005) were analysed using the detector itself as an active target. K^- nuclear interactions in the gas filling the KLOE drift chamber (Helium 90% and Isobutane 10%) and the drift chamber entrance wall (mainly Carbon) were explored. Starting point was the reconstruction of the Lambda(1116) trough its decay into a proton and a pion (BR = 63.9 pm 0.5%). Taking advantage of the good performances of the KLOE calorimeter in detecting photons we then focused on the investigation of the Lambda(1405), through its decay into Sigma^0pi^0. The details of the Sigma^0 pi^0 analysis and preliminary results are presented.
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The AMADEUS experiment aims to perform dedicated precision studies in the sector of low-energy kaon-nuclei interaction at the DAPhi NE collider at LNF-INFN. In particular the experiment plans to perform measurements of the debated deeply bound kaonic nuclear states (by stopping kaons in cryogenic gaseous targets 3He and 4He) to explore the nature of the Lambda(1405) in nuclear environment and to measure the cross section of K- on light nuclei, for K- momentum lower than 100 MeV/c. The AMADEUS dedicated setup will be installed in the central region of the KLOE detector.
In this paper we discuss the recent finalized analyses by the KLOE experiment at DA$Phi$NE: the CPT and Lorentz invariance test with entangled $K^0 bar{K}^0$ pairs, and the precision measurement of the branching fraction of the decay ${ K^+} rightarrow pi^+pi^-pi^+(gamma)$. We also present the status of an ongoing analysis aiming to precisely measure the $K^{pm} $ mass.
The low-energy strong interaction of antikaons (K-) with nuclei has many facets and rep- resents a lively and challenging research field. It is interconnected to the peculiar role of strangeness, since the strange quark is rather light, but still much heavier than the up and down quarks. Thus, when strangeness is involved one has to deal with spontaneous and explicit symmetry breaking in QCD. It is well known that the antikaon interaction with nucleons is attractive, but how strong ? Is the interaction strong enough to bind nucleons to form kaonic nuclei and, if so, what are the properties (binding energy, decay width)? There are controversial indications for such bound states and new results are expected to come soon. The existence of antikaon mediated bound states might have important consequences since it would open the possibility for the formation of cold baryonic matter of high density which might have a severe impact in astrophysics for the understanding of the composi- tion of compact (neutron) stars. New experimental opportunities could be provided by the AMADEUS experiment at the DA?NE electron-positron collider at LNF-INFN (Frascati, Italy). Pre-AMADEUS studies on the antikaon interaction with nuclei are carried out by analysis of data collected by KLOE in till 2005 and in special data runs using a carbon target insert. Studies for the dedicated AMADEUS detector setup taking advantage of the low-energy antikaons from Phi-meson decay delivered by DAFNE are in progress. Some re- sults obtained so far and the perspectives of the AMADEUS experiment are presented and discussed.
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 DAPhiNE phi-factory, e^+e^- to phi 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 tau = (12.347pm0.030) ns.
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.
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