Conveners
Parallel 6
- Massimiliano Grazzini (University of Zurich)
Parallel 6
- Massimiliano Grazzini (University of Zurich)
The worldline formalism shares with string theory the property that it allows one to write down master integrals that effectively combine the contributions of many Faynman diagrams. While at the one-loop level these diagrams differ only by the position of the external legs along a fixed line or loop, at the multiloop level they generally involve different topologies. However, evaluating such...
We compute the two-loop master integrals relevant for the NNLO QCD correction to heavy pseudo-scalar quarkonium production and decay both analytically and numerically. The analytic expressions involve elliptic multiple polylogarithms and iterated integrals of modular forms. We discuss the master integral computation and the form-factors obtained. We briefly discuss their phenomenological...
We report on the calculation of the previously unknown 2- and 3-loop QCD corrections to the flavor precision observable $\Delta \Gamma_{12}^s$ that arises in the mixing of neutral $B_s$ mesons. This project is a crucial step towards the task of reducing the existing perturbative uncertainties of this observable which happen to be much larger than the current experimental error.
