next up previous contents
Next: Energy-Energy Correlation Up: Event Statistics Previous: Event Statistics   Contents

Multiplicities

Three options are available to collect information on multiplicities in events. One gives the flavour content of the final state in hard interaction processes, e.g. the relative composition of $\d\overline{\mathrm{d}}/ \u\overline{\mathrm{u}}/ \mathrm{s}\overline{\mathrm{s}}/ \c\overline{\mathrm{c}}/ \b\overline{\mathrm{b}}$ in $\mathrm{e}^+\mathrm{e}^-$ annihilation events. Additionally it gives the total parton multiplicity distribution at the end of parton showering. Another gives the inclusive rate of all the different particles produced in events, either as intermediate resonances or as final-state particles. The number is subdivided into particles produced from fragmentation (primary particles) and those produced in decays (secondary particles).

The third option tabulates the rate of exclusive final states, after all allowed decays have occurred. Since only events with up to 8 final-state particles are analysed, this is clearly not intended for the study of complete high-energy events. Rather the main application is for an analysis of the decay modes of a single particle. For instance, the decay data for $\mathrm{D}$ mesons is given in terms of channels that also contain unstable particles, such as $\rho$ and $\eta$, which decay further. Therefore a given final state may receive contributions from several tabulated decay channels; e.g. $\mathrm{K}\pi \pi$ from $\mathrm{K}^* \pi$ and $\mathrm{K}\rho$, and so on.


next up previous contents
Next: Energy-Energy Correlation Up: Event Statistics Previous: Event Statistics   Contents
Stephen Mrenna 2007-10-30