First observation of the exclusive decays Lambda(+)(c)->Lambda pi(+)pi(+)pi(-)pi(0) and Lambda(+)(c)->Lambda omega pi(+)
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Using data collected by the CLEO III detector at CESR, we report on the first observation of the decays c+ + + - 0 and c+ + . The branching fractions are measured relative to the pK - + mode; we find B( c+ + + - 0 )/B(Lambda; c+ pK - + ) = 0.360.09(stat) 0.09(syst) and B( c+ + )/B( c+ pK - + ) = 0.240.06(stat)0.06(syst). We also observe a small excess of events in c+ + , + - 0 from which we find B( c+ + )/B( c+ pK - + ) = 0.410.170. 10 with a corresponding limit of <0.65% at 90% confidence level. This rate is consistent with previous measurements of c+ + , - . We find that the combined branching fractions for c+ Lambda; + and c+ + + - 0 )B( c+ comprise (8713) of the total rate. We set an upper limit on B( c+ + + -0 )/B c+ pK - + for non- and non- modes of 0.13 at 90% confidence level. 2003 The American Physical Society.