B**s and Sigma(*)b excited states

Present situation

Evidence for B**s orbital excitations decaying into B(*) K has been shown by DELPHI at HEP95. Evidence for excitated B baryons has been reported by DELPHI also at this conference. Nothing has been published yet. OPAL has seen also the production of B**s states but DELPHI seems to observe two peaks in the mass distribution. No other collaboration has shown evidence for excited baryon states. Measured masses of these states are not also exactly those expected from HQET. It is thus important to redo this analysis with higher statistics and better algorithms to check the validity of the original signals.

What remains to be done

A new analysis of these two channels has to be done to confirm signals seen in the previous analysis, to evaluate production rates and to measure masses of these states. It will benefit from the improvements obtained in energy measurement, particle identification and tracking. It will give rise to the only publications of DELPHI on these channels.

Tools and contact-persons

The analysis can be done using the BSAURUS package. Contact persons: