Charm lifetime

Charm Lifetime

A review of the charmed meson and baryon lifetimes is presented. Our knowledge of charmed particle lifetimes has greatly improved over the past two years, a crucial rôle having been played by the E687 experiment at Fermilab, which has almost quadrupled the samples of D mesons. The lifetime ratios τ (D +)/τ (D 0) and τ (D + s)/τ (D 0) are now known with an accuracy of 1.7% and 3.7% respectively....

Charm Counting and Lifetime Differences in Inclusive Bottom Hadron Decays

Discovery of naked charm particles and lifetime differences among charm species using nuclear emulsion techniques innovated in Japan

This is a historical review of the discovery of naked charm particles and lifetime differences among charm species. These discoveries in the field of cosmic-ray physics were made by the innovation of nuclear emulsion techniques in Japan. A pair of naked charm particles was discovered in 1971 in a cosmic-ray interaction, three years prior to the discovery of the hidden charm particle, J/Psi, in ...

Charm Decays

To write a review on charm decays is not an easy task because of the large amount (fortunately!) of experimental results in the recent years. I was forced to make a selection of topics. I am going to discuss with the eyes of an experimentalist: D-D 0 mixing, CP violation, rare decays, charm lifetimes, semileptonic decays, hadronic decays, and the big surprise of the DsJ states. Obviously there ...

Charm fragmentation and excited charm and charm-strange mesons at ZEUS

Charm hadrons were produced copiously in ep collisions with a centre-of-mass energy of 318GeV at HERA providing a means to study charm hadronisation. During first phase of the HERA operation (1992-2000), the ZEUS collaboration accumulated data sample corresponding to an integrated luminosity of ∼ 120 pb. Measurements of the D, D, D and Λc production a with the HERA I data were used to determine...