Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 74: Flavour Physics V
T 74.6: Vortrag
Donnerstag, 3. April 2025, 17:30–17:45, VG 1.104
Λb baryon LCDAs in the short-distance expansion — Thorsten Feldmann and •Daniel Vladimirov — Theoretische Physik 1, Center for Particle Physics Siegen, Universität Siegen, 57068 Siegen, Germany
Light-cone distribution amplitudes (LCDAs) for the Λb baryon enter as universal hadronic matrix elements in QCD factorization approaches for energetic decays. Observables (e.g. form factors) can then be expressed as a convolution of the LCDA and a hard scattering kernel to the desired order in the strong coupling. The LCDAs are genuinely non-perturbative quantities that describe the low-energy dynamics of the hadronic bound state, which cannot directly be derived from first principles. In this work, we discuss the ”radiative tail” of the 3-particle Λb LCDAs which can be computed in HQET perturbation theory by expanding in the light-cone separations between the light and heavy quarks in the baryonic bound state. Our results provide useful constraints on the modelling of Λb LCDAs in terms of a handful of HQET parameters.
Keywords: Heavy flavours; QCD factorization; Heavy quark effective theory