Go to the Indico Home Page Oldest event Older event Up to category Newer event Newest event Printable version
  • Event
  • Lecture
    • Switch to the management area of this event
    Login
    TH Meeting on Particle Physics Phenomenology

    Improving the perturbative predictions for B -> Xs <font face=\"Symbol\">g</font>

    by Mikolaj MISIAK (CERN-TH)

    → Europe/Zurich
    TH Auditorium (CERN)

    TH Auditorium

    CERN
    Description
    The charm quark loop contribution to B -> Xs g is found to be numerically dominant and very stable under QCD corrections. The huge enhancement of the branching ratio by QCD logarithms is mainly due to the b-quark mass evolution in the top-quark sector. These observations allow for better control of residual scale dependence at the next-to-leading order and reduction of the perturbative uncertainty from previously estimated 7% to around 3%. Once this uncertainty is reduced, some non-perturbative effects that have been neglected so far have to be reconsidered.