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This work summarizes the current status of the measured semileptonicbranching fractions $B^{0,+} \to X_c \mu\nu$. The sum of exclusive measurementsis compared with the inclusive determination, accounting for isospinextrapolation. Further derived quantities are computed, taking into accountdifferent explanations for the unmeasured components of the total branchingfraction. These quantities focus on the charge breakdown of the final states,and are designed for use as inputs or comparisons in future experimentalmeasurements.

An experimentalist's guide to the semileptonic bottom to charm branching fractions