Seminarium "Teoria cząstek elementarnych i kosmologia"
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2020-03-19 (12:15) 
Mikołaj Misiak (IFT UW)
[ON-LINE] B -> Xs gamma$ @ NNLO and feasibility of B -> Xc l nu @ NNNLO
https://meet.google.com/iie-rdtz-ddo?hs=122 (the seminar takes place on-line only)
Strengthening constraints on new physics from the B -> Xs gamma branching ratio requires improving accuracy in the measurements and the Standard Model predictions. To match the expected Belle-II accuracy, Next-to-Next-to-Leading Order (NNLO) QCD corrections must be calculated without the so-far employed interpolation in the charm-quark mass. I am going to summarize the current status of such calculations. Moreover, I will describe recent improvements in estimating non-perturbative contributions to BR[B -> Xs gamma], and the resulting update of the SM prediction. Finally, feasibility of determining the NNNLO QCD corrections to the inclusive semileptonic B -> Xc l nu decay is going to be discussed.
The slides are available at https://www.fuw.edu.pl/~misiak/misiak.html