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SUMMARY:Colour meets Flavour: QCD contributions to the decay of heavy hadr
 ons - Maria Laura Piscopo (University of Siegen)
DTSTART:20220524T150000Z
DTEND:20220524T160000Z
UID:TALK174245@talks.cam.ac.uk
CONTACT:Heribertus Bayu Hartanto
DESCRIPTION:Lifetimes of heavy hadrons are determined experimentally very 
 precisely by now. On the theoretical side\, the total decay width\, namely
  the inverse of the lifetime\, can be systematically computed in the frame
 work of the heavy quark expansion (HQE) in terms of a series expansion in 
 inverse powers of the heavy quark mass mQ. The applicability of the HQE st
 rongly relies on the assumption that mQ is much larger than the typical ha
 dronic scale\, and in order to obtain precise theoretical predictions it i
 s crucial to have good control on higher power corrections. \nIn this talk
 \, I will discuss the computation of the Darwin operator contribution\, wh
 ich corresponds to corrections of order mQ^{-3} in the HQE and review the 
 current theoretical status for quantities like B and D mesons lifetime and
  mixing. Finally\, by comparing precise measurements with the correspondin
 g HQE predictions\, it is possible to constrain the parameter space for ne
 w physics models that might e.g. explain the B anomalies.
LOCATION:Ryle Seminar Room
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