We present a measurement of the KL lifetime using the KLOE detector. From a sample of ∼ 4 × 10 KSKL pairs following the reaction ee → φ → KSKL we select ∼ 15 × 10 KL → πππ decays tagged by KS → ππ events. From a fit of the proper time distribution we find τL = (50.92 ± 0.17stat ± 0.25syst) ns. This is the most precise measurement of the KL lifetime performed to date. PACS: keywords:

There has been an explosion of formal work in commonsense reasoning in the past fteen years, but almost no signiicant connection with work in building commonsense reasoning systems (cognitive or otherwise). We explore the reasons, and especially the ideal formal assumption of omniscience, reviewing and extending arguments that this is irreparably out of line with the needs of any real reasoning...

We have carried out a series of small scale collisional N-body calculations of single-mass star clusters to investigate the dependence of the lifetime of star clusters on their initial parameters. Our models move through an external galaxy potential with a logarithmic density profile and they are limited by a cut-off radius. In order to find scaling relations between the lifetime of star cluste...

High-quality oscillator strengths are needed to convert the amount of interstellar absorption into an accurate abundance from data acquired with the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. In order to help clarify the appropriate values to use for ultraviolet transitions in Cu ii, we report lifetimes from our beam-foil experiments. The Cu ii results for the 1358.7...

BACKGROUND The absence of coronary artery calcium (CAC) in middle age is associated with very low short-term risk for coronary events. However, the long-term implications of a CAC score of 0 are uncertain, particularly among individuals with high cardiovascular lifetime risk. We sought to characterize the association between predicted lifetime risk and incident CAC among individuals with low sh...

The rules for inheritance of classes with respect to data and function members are well defined. For example, the proposals for programming by contract in Eiffel ensure additional consistency between superclasses and subclasses. In object-oriented design, it is common to capture the behaviour of classes with lifecycles which are expressed in the form of finite state machines. In this context, t...

When interpreted as a model for structuring programs and organizing computations, the object-oriented paradigm can be thought as a set of abstractions independent of the host language. By generalizing the notion of object state configuration with respect to that embedded in languages based on assignment, this paper explores a relational approach to object-oriented programming. An object-oriente...

Peer-to-peer (P2P) web caching has been studied recently as it can exploit local caches of peers for web caching without additional infrastructure. However, dynamic join/leave behaviors or local caching strategies of the peers due to their autonomy in a P2P network may limit the performance of P2P web caching. To overcome these limitations, we propose an effective directory-based P2P web cachin...

Fluorescence imaging is a widely adopted technique in various scientific disciplines for mapping chemical and biological characteristics or molecular interactions in cells by generating high contrast images in a non-invasive way. Recently, fluorescence lifetime imaging microscopy (FLIM) has become a practical alternative to fluorescence intensity thanks to affordable pulsed laser sources and co...