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The problem of the $\Xi_{c}^{+}$ lifetime is considered in the framework of{\em Heavy-Quark Expansion} and $SU(3)_{flavor}$ symmetry. The lifetime of$\Xi_{c}^{+}$ is expressed in terms of measurable inclusive quantities of theother two charmed baryons belonging to the same $SU(3)_{flavor}$ multiplet in amodel-independent way. In such a treatment, inclusive decay rates of singlyCabibbo suppressed decay modes have a prominent role. An analogous approach isapplied to the multiplet of charmed mesons yielding interesting predictions on$D_{s}^{+}$ properties. The results obtained indicate that a more precisemeasurement of inclusive decay quantities of some charmed hadrons (such as$\Lambda_{c}^{+}$) that are more amenable to experiment can contributesignificantly to our understanding of decay properties of other charmed hadrons(such as $\Xi_{c}^{+}$) where discrepancies or ambiguities exist.Comment: 9 pages, revtex4; certain improvements in text as suggested by the  referee, acknowledgement changed; version to appear in Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Cabibbo suppressed decays and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>Ξ</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>lifetime

Cabibbo suppressed decays and theΞc+lifetime