Lattice meets Continuum

Session

Afternoon 1

30 Sept 2024, 14:30

24. Matching perturbation theory and lattice

Martin Gorbahn

30/09/2024, 14:30

6. Sum Rules for Lifetimes

Zachary Wüthrich (Siegen)

30/09/2024, 15:30

Precise determination of hadronic matrix elements plays a crucial role for interpreting potential deviations from the Standard Model observed in experiments testing flavor physics. While lattice QCD provides first principles calculations, current results are still limited to a subset of the operators that may appear in theories of new physics. The sum rule approach allows for a complementary...

8. Factorial growth of perturbation theory and inclusive semileptonic B decays

Andreas Kronfeld (Fermilab)

30/09/2024, 15:50

TBA

23. Gradient flow and the short flow time expansion

Robert Harlander (RWTH Aachen University)

01/10/2024, 14:30

7. Extracting excited-state contributions of the $ B_s $ to $ D_s $ semi-leptonic decays from inclusive lattice simulations

Zhi HU (High Energy Accelerator Research Organization (KEK))

01/10/2024, 15:30

We present a pilot study on extracting the P-wave form factors of the $ B_s $ to $ D_s $ semi-leptonic decays from the $B_s$ four-point correlators. With their inclusive nature, four-point correlators include all the exclusive states from $B_s$ with valence content of $c$ and $s$ quarks. We access the excited-state contributions by carefully fitting the correlators using multiple exponentials....

5. Radiative corrections to $B\rightarrow \ell \nu $

Max Ferré (JGU (Mainz))

01/10/2024, 15:50

In this talk I will focus on the study of the leptonic $B\rightarrow \ell \nu $ decay at next-to-leading order in QED. The future improvements of experimental measurements of this channel require a reliable theory prediction, hence a careful theoretical estimate of QED corrections. The multi-scale character of this process requires an appropriate effective theory (EFT) construction to...

14. Semileptonic B->D* decays

Martin Jung (Università di Torino & INFN, Sezione di Torino)

02/10/2024, 14:30

9. Form factors for semi-leptonic $B_{(s)} \to D_{(s)}^∗\ell \nu_\ell$ decays

Anastasia Boushmelev (University of Siegen)

02/10/2024, 15:30

Semileptonic $B_{(s)}$​ decays are of great phenomenological interest because they allow to extract CKM matrix elements or test lepton flavor universality. Taking advantage of existing data, we explore extracting form factors for vector final states​ using the narrow width approximation. Based on RBC-UKQCD's set of 2+1 flavor gauge field ensembles with Shamir domain-wall fermion and Iwasaki...

4. Semileptonic B decays into final states with heavy sterile neutrinos

Ulrich Nierste (KIT)

02/10/2024, 15:50

$B\to D^* \ell \nu$ decays are sensitive to contributions in which the missing energy and momentum stem from a hypothetical heavy sterile neutrino $N$. Belle II data on angular distributions in this decay are a used to search for hints $B\to D^* \ell N$ in a model-independent way. To this end dimension-6 operators with different Dirac structures are considered and competitive upper bounds on...