In the heavy quark limit, the differential decay rates of B to D, B to D*, and Lambda_b to Lambda_c with tau leptons satisfy an exact sum rule independent of new physics, with corrections quantified for realistic masses and form factors.
Weak Decays of Heavy Mesons in the Static Quark Approximation,
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Heavy quark symmetry behind $b \to c$ semileptonic sum rule
In the heavy quark limit, the differential decay rates of B to D, B to D*, and Lambda_b to Lambda_c with tau leptons satisfy an exact sum rule independent of new physics, with corrections quantified for realistic masses and form factors.