HADRONIC DECAYS OF THE Q (2980)* The MARK III Collaboration

From a studyof 2.7 million J/I/J decays with the MARK III detector at SPEAR, we determine branching ratios for decays of the Q to q?r+~-, x*KrKs, T+T-T+T-, ?r+r-K+K-, pp, the previously unobserved modes q’?r+x-, I~OK+K-, K*qfg+, K*q*O, and new upper limits on pp, ww, 6~, A2 T, ~T,J and r]KK. When combined, the different measurements of the qc mass yield (2980.2 f 1.6) MeV/c2. In the decays Q + vector vector, a strong increase of the decay rate with the number of strange quarks in the final state is observed.