Semileptonic decays of Lambda(c) and Lambda(b) baryons involving heavy to light transitions and the determination of |V(ub)|

baryons which involve transitions of a heavy quark to a light quark. In a previous work we used data on the Cabibbo favoured non-leptonic decays of charmed baryons

\Lambda_c \rightarrow \Lambda \pi~{+}

and

\Lambda_c \rightarrow \Sigma~{+} \pi~{0 }

to obtain information on the form factors in the

c \rightarrow s

transition. This form factor informations is used to study the semi-leptonic decay

\Lambda_c \rightarrow \Lambda l \nu

. Using SU(3) symmetry and HQET it is shown how a knowledge of form factors in

\Lambda_c \rightarrow \Lambda l \nu

can be applied to

\Lambda_b \rightarrow p l \nu

decay and used to measure

|V_{ub}/V_{cs}|~{2}

.

width: ratio
polarization
form factor
quark: strangeness
symmetry: SU(3)
HQET model
CKM matrix matrix
decay: asymmetry
asymmetry: decay
correction: mass

References(11)

Figures(0)

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