LHCb published a measurement of |Vub/Vcb| from the
partial rate for Λb→pμν normalized to
Λb→Λcμν, [arXiv:1504.01568].
The published value, |Vub/Vcb|=0.083+-0.004exp.+-0.004th.
updated to the HFAG average result for the Branching Fraction BF(Λc→p K π)=(6.46 +- 0.24)%,
is
|Vub/Vcb|=0.080+-0.004exp.+-0.004th.
The result of a combined fit using as input only the exclusive |Vcb| and |Vub| measurements, with the |Vub/Vcb| measurement gives the following results
|Vub|=(3.50 +- 0.13)x10-3
|Vcb|=(39.13 +- 0.59)x10-3
the correlation is ρ=0.14, with a fit P(χ2)=11.0%. In this combination the uncertainties
are considered uncorrelated.
The result of the fit is shown here
.C,
.pdf,
.png.