Lattice meets Continuum

Session

Afternoon 2

30 Sept 2024, 16:40

3. Gradient Flow Renormalisation for Meson Mixing and Lifetimes

Fabian Lange (Universität Zürich and Paul Scherrer Institut)

01/10/2024, 16:40

The gradient flow offers a unique renormalization scheme applicable in both perturbation theory and lattice calculations. Especially, it suppresses operator mixing on the lattice, shifting it to the perturbative matching calculation. In this talk, we discuss using the gradient flow scheme for the four-quark operators describing neutral meson mixing and lifetimes. While meson mixing...

1. Short Flow-Time Expansion of the LEFT basis: Background Field Method and Chiral Symmetry

Òscar Lara Crosas (UZH and PSI)

01/10/2024, 17:00

In this talk, I will present the Short Flow-Time expansion (SFTE) of operators present in the Low Energy Effective Field Theory (LEFT) up to dimension six, in the HV scheme. To be able to perform an off-shell calculation and avoid mixing with gauge-variant operators, we make use of the Background Field Method applied to the Gradient Flow. Moreover, we restore chiral symmetry by introducing...

33. CKM unitarity and a truly global EFT analysis

Tom Tong (Universität Siegen)

01/10/2024, 17:20

11. Semileptonic Inclusive Decay of the $D_s$ Meson from Lattice QCD

Christiane Groß (HISKP, Uni Bonn)

02/10/2024, 16:40

We analyse the decay of the $D_s$ meson, focusing on the $D_s \to X \ell \nu$ channel based on Extended Twisted mass ensembles at the physical pion mass value.
On the basis of four-point correlation functions, we use the HLT reconstruction method to calculate the differential decay rate and differential first lepton energy moment.
The analysis is performed at four different lattice spacings,...

2. Continuum approaches to semileptonic $s \to d$ and $b \to s(d)$ transitions

Jack Jenkins (University of Siegen)

02/10/2024, 17:00

In this talk I will discuss a continuum approach to the nonlocal contribution to rare kaon decays such as $K^+ \to \pi^+ \nu \nu$, with an emphasis on whether and how to decouple the charm. I will also motivate determinations of isospin breaking effects in $\Delta B=0$ four-quark operators as input for theoretical predictions of inclusive semileptonic $b \to s(d)$ decays.

37. A look into the $f_0(980)$ through the lens of rare B meson decays

Jaime del Palacio Lirola (University of Siegen)

02/10/2024, 17:20

The nature of many experimentally observed hadronic resonances has been a topic of debate ever since the 1960's. In this work, we focus on studying the $f_0(980)$, the second lightest unflavoured scalar resonance. We comment on the different descriptions for it in the quark model, and focus specifically on the pure $s\bar s$ picture. We mainly explore the $B_s^0 \rightarrow f_0(980)\mu^+\mu^-$...

30. HQET on the lattice

Jochen Heitger

36. TBA

N N

35. TBA

N N

32. TBA

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