Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 37: Theorie: QCD / Top-Physik / Elektroschwache Physik
T 37.9: Vortrag
Dienstag, 20. März 2018, 18:30–18:45, Z6 - SR 1.013
Two mass contributions to three loop operator matrix elements and the variable flavour number scheme — Johannes Blümlein1, Abilio De Freitas1, Carsten Schneider2, and •Kay Schönwald1 — 1DESY, Zeuthen, Deutschland — 2RISC, Johannes Kepler Universität Linz, Österreich
Beginning at three loop order, massive operator matrix elements receive contributions from irreducible diagrams containing two different masses, i.e. the charm and bottom quark. Since their mass ratio mc2 / mb2 ∼ 1/10 is non-negligible, both have to be decoupled together.
We show the implications of the simultaneous decoupling for the variable flavor number scheme and present the three loop, two mass contributions to the pure singlet and gluonic operator matrix element.