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====== P3H-25-019: QCD Corrections for Subleading Powers in  $1/m_b$ for the nonleptonic $b\rightarrow c\b ======

^P3H-25-019 ^
|Title: QCD Corrections for Subleading Powers in  $1/m_b$ for the nonleptonic $b\rightarrow c\b |
|Type: Paper |
|Authors: Thomas Mannel, Daniel Moreno, Alexei Pivovarov | 
|arXiv: N.A. |
|Info: We compute next-to-leading order QCD corrections to the $1/m_b^2$ terms for the contribution to inclusive bottom hadron decays 
induced by the operators $b \to c \bar c q$ ($q = s,d$). This calculation adds the last missing 
piece of the full NLO terms at $1/m_b^2$ in the heavy quark expansion of $B$-hadron lifetimes. 
We consider the current-current operator contributions to the
decay modes $b\rightarrow c\bar c s$ and $b\rightarrow c \bar c d$, disregarding here
the contributions from penguin operators and the weak chromomagnetic operator due to the smallness of their Wilson coefficients. However, using the technology set up here, all four quark-operator contributions can be calculated. 
We obtain analytical results with full dependence on the final-state charm quark mass, 
which we provide in the supplemental file "coefbccs.m".  |