arXiv subjects
Publications and source records attributed to Hanna Mahlke.
Valuable data on quarkonia (the bound states of a heavy quark Q=c,b and the corresponding antiquark) have recently been provided by a variety of sources, mainly e+ e- collisions, but also hadronic interactions. This permits a thorough updating of the experimental and theoretical status of electromagnetic and strong transitions in quarkonia. We discuss QQbar transitions to other QQbar states, with some reference to processes involving QQbar annihilation.
A selection of studies highlighting different manifestations of the strong interaction are presented. Many new results have become available this summer in the regimes of discovery, systematic survey, and precision measurements of bound quark states.
Recent results in leptonic and semileptonic D decays by BaBar, Belle, CLEO, and FOCUS are reviewed and compared with theoretical predictions.
Recent results in the field of Heavy Quarkonia are reviewed, with results either providing new precision measurements or addressing key unanswered questions.
The experimental status of stable bound states made out of heavy quarks is reviewed. The need for a way to deal with the non-perturbative transitions involved calls for precision measurements on one hand, and for discovery of as yet undetected states to confirm predictions on the other. In this article, recent experimental contributions to heavy quarkonia spectroscopy and decay will be reviewed, mostly from data analyzed by the BES and CLEO collaborations. The most dramatic recent discoveries include the detection of the first stable L=2 state, and a first non-pionic hadronic transition in the Upsilon system, and a first measurement of chi_cJ --> Lambda Lambdabar. Scans of the psi' and Upsilon(1,2,3S) resonances are used to add information on partial and total decay widths.