Sep 5 – 10, 2021
Europe/Lisbon timezone

Standard Model prediction of the Bc lifetime (17+3)

Sep 8, 2021, 4:40 PM


Talk Flavour physics - CKM and beyond Flavour physics - CKM and beyond


Jason Aebischer (UCSD)


Applying an operator product expansion approach an updated Standard Model prediction of the $B_c$ lifetime is presented. The non-perturbative velocity expansion is carried out up to third order in the relative velocity of the heavy quarks. The scheme dependence is studied using three different mass schemes for the $\bar b$ and $c$ quarks, resulting in three different values consistent with each other and with experiment. Uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties are discussed in detail. The resulting uncertainties are still rather large compared to the experimental ones, and therefore do not allow for clear-cut conclusions concerning New Physics effects in the Bc decay.

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