2,677 research outputs found
Lifetimes of Heavy-Flavour Hadrons -- Whence and Whither?
A theoretical treatment for the weak decays of heavy-flavour hadrons has been
developed that is genuinely based on QCD. Its methodology as it applies to
total lifetimes and the underlying theoretical issues are sketched. Predictions
are compared with present data. One discrepancy emerges: the beauty baryon
lifetime appears to be significantly shorter than expected. The ramifications
of those findings are analyzed in detail.Comment: 15 pages, no figures, LATEX, two references added and new information
concerning a lower charm content in B decays incorporate
Open Questions in Charm Decays Deserving an Answer
A list is given of those open questions concerning the dynamics of charm
decays where there exists a strong need for an answer. Such a need is based on
lessons to be learnt about QCD -- either in their own right or for a better
understanding of physics -- or on searches for New Physics with a small
background from the Standard Model. The major items on this list are: lifetimes
of the baryons; semileptonic branching ratios of , and hadrons and absolute branching ratios for those states;
radiative decays ;
oscillations down to a sensitivity below and CP asymmetries in
non-leptonic decays down to 0.1\%. Ongoing and already approved experiments
will produce important new insights, which are unlikely to provide sufficient
answers to all these questions yet. It is discussed how a third-generation
fixed-target experiment like CHARM2000 or a -charm factory can fill the
bill.Comment: 9 pages, LATEX, preprint CERN-TH.7370/9
CP, T and CPT Symmetries at the Turn of a New Millenium
After summarizing the status concerning CP violation in 1998 I describe the
exciting developments of the last two years and extrapolate to the future. I
comment on recent lessons about T and CPT invariance maninly from CPLEAR and
emphasize the potential of finding New Physics by analyzing and
charm decays and searching for electric dipole moments.Comment: 21 pages, LaTex, Lecture given at LEAP2000, Venice, Italy, Aug. 21 -
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