School on Continuum Foundations of Lattice Gauge Theories

Session

Posters

22 Jul 2024, 18:00

500/1-201 - Mezzanine (CERN)

38. $DK/D\pi$ scattering and an exotic virtual bound state from lattice QCD

22/07/2024, 19:00

Poster

The ground state scalar D-mesons, the $D^*_0 (c\bar{l})$ and $D^*_{s0}(c\bar{s})$, do not adhere to expectations and have sparked much theoretical discussion. Although these mesons have been explored in previous lattice studies of $D\pi$ and $DK$ scattering, there are still questions about the underlying physics in this sector. In this poster, we report on a study where finite-volume spectra...

11. Adjoint Correlators at Finite Temperature with Gradient Flow

22/07/2024, 19:00

Poster

The evolution of a particle in the Quark-Gluon Plasma is determined by transport coefficients. Especially the diffusion of a heavy adjoint quark or quarkonium can be measured from the correlator of two chromoelectric field operators connected by a static Wilson line in the adjoint representation. The first mass correction is then given by using chromomagnetic fields instead. However, the...

37. Baryonic Weak Decay from Lattice QCD

22/07/2024, 19:00

Poster

Determining the form factors for Semileptonic Decay processes on the lattice is essential for understanding CKM matrix elements. Some of these decay processes are $\Sigma_b \rightarrow \Sigma_c$, $\Omega_b \rightarrow \Omega_c$, and $\Xi_c \rightarrow \Xi$, the later one is observed in experiments like Belle and ALICE. Meson decays are extensively studied on the lattice, however baryon decays...

13. Euclidean Monte Carlo informed ground state preparation for quantum simulation

22/07/2024, 19:00

Poster

Quantum simulators offer great potential for investigating the dynamical properties of quantum field theories. However, a key challenge is the preparation of high-fidelity initial states for these simulations. In this study, we focus on ground states and explore how information about their static properties, which can be efficiently obtained using classical methods such as lattice-based...

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

22/07/2024, 19:00

Poster

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...

35. Gauge field digitization in the Hamiltonian limit

22/07/2024, 19:00

Poster

The use of quantum computers could circumvent the complex action problem hampering first-principles studies of gauge theories in real time or at finite density. One of the main bottlenecks of quantum computers is the limited number of available qubits. One approach to mitigate this bottleneck is the discretization of continuous gauge groups to their discrete subgroups, which introduces...

33. Investigating the behavior of the Lattice Model using the Tensor Renormalization technique.

22/07/2024, 19:00

Poster

Simulating higher-dimensional lattice models remains a significant challenge, spurring interest in advanced renormalization group (RG) methods for tensor-network states. One such model we study here is the two-dimensional XY model. This theory has been understood greatly and undergoes a BKT type of phase transition. Adding an extra spin-nematic interaction term with period, the modified XY...

15. Lattice determination of the NLO HVP contributions to the muon g-2

22/07/2024, 19:00

Poster

In this work, we present a full lattice computation for the NLO contribution to the HVP of the muon g-2. First, we study the time-momentum representation (TMR) of the three kernels needed to compute the three different NLO HVP diagrams, following the work of Balzani, Laporta and Passera. For the HO corrections including extra photon or lepton lines, we present an analytical series of...

9. Localization of Dirac modes in the finite temperature SU(2)-Higgs model

22/07/2024, 19:00

Poster

Low-lying Dirac modes become localized at the finite-temperature
transition in QCD and other gauge theories, indicating a connection
between localization and deconfinement. This phenomenon can be
understood through the "sea/islands" picture: in the deconfined phase,
modes become trapped on "islands" of Polyakov loop fluctuations within
a "sea" of ordered Polyakov loops.

To test the...

7. Non-perturbative lattice studies of exotic multiquark systems

22/07/2024, 19:00

Poster

Understanding baryon-baryon interactions is key in nuclear physics because these interactions form the foundation of atomic nuclei. Despite many experiments, the deuteron is still the only confirmed dibaryon bound state, with recent evidence for an unstable light dibaryon, d*(2380). Other dibaryons, if any exist, remain undiscovered. Our study employs state-of-the-art lattice QCD techniques to...

5. Proper time path integrals for gravitational waves: an improved wave optics framework

22/07/2024, 19:00

Poster

When gravitational waves travel from their source to an observer, they interact
with matter structures along their path, causing distinct deformations in their waveforms. In
this study we introduce a novel theoretical framework for wave optics effects in gravitational
lensing, addressing the limitations of existing approaches. We achieve this by incorporating
the proper time technique,...

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

22/07/2024, 19:00

Poster

In this poster I will focus on the study of the leptonic channel $B^- \rightarrow \ell^- \bar \nu$
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)...

16. Scattering wave packets of hadrons in gauge theories: Preparation on a quantum computer

22/07/2024, 19:00

Poster

Quantum simulation holds promise of enabling a complete description of high-energy scattering processes rooted in gauge theories of the Standard Model. A first step in such simulations is preparation of interacting hadronic wave packets. To create the wave packets, one typically resorts to adiabatic evolution to bridge between wave packets in the free theory and those in the interacting...

6. Semiconductor quantum simulator for lattice gauge theories

22/07/2024, 19:00

Poster

Semiconductor spin qubits are ideal for scalable quantum computing due to their long coherence times and compatibility with existing semiconductor fabrication technology. For quantum simulation of lattice gauge theories, the encoding of fermionic d.o.f. into qubits becomes complicated in higher dimensions. Furthermore, encoding with bosonic d.o.f. in a digital scheme introduces additional...

10. Simulating an SO(3) Quantum Link Model with Dynamical Fermions in 2+1 Dimensions

22/07/2024, 19:00

Poster

Quantum link models (QLMs) are generalizations of Wilsonian lattice gauge theory which can be formulated with finite-dimensional link Hilbert spaces, and which can be embedded onto local spin Hamiltonians for efficient quantum simulation by exact imposition of the Gauss Law constraint. Previously, SO(3) QLMs have been studied in 1+1d and shown to reflect key properties of QCD and nuclear...

34. Studies on inclusive semileptonic decays from lattice QCD

22/07/2024, 19:00

Poster

We report on the nonperturbative calculation of the inclusive decay rate for semileptonic decays of the $D_s$ meson from lattice QCD. We present a short overview on how the Chebyshev approximation can be employed in order to obtain predictions for the total inclusive decay rate from hadronic correlators generated from lattice simulations. We further present first estimates on the systematic...

8. Symplectic quantization: a new deterministic approach to the dynamics of quantum fields inspired by statistical mechanics

22/07/2024, 19:00

Poster

The present work is about a new method to sample the quantum fluctuations of relativistic fields by means of a pseudo-Hamiltonian dynamics in an enlarge space of variables. The proposed approach promotes the fictitious time of Parisi-Wu stochastic quantisation to a true physical parameter controlling a deterministic dynamics. The sampling of quantum fluctuations is guaranteed by the presence...

14. Using AI for Efficient Statistical Inference of Lattice Correlators Across Mass Parameters

22/07/2024, 19:00

Poster

We study an application of supervised learning to infer two-point lattice correlation functions at one input mass from correlator data computed at a different target mass. Learning across the mass parameters could potentially reduce the cost of expensive calculations involved in light Dirac inversions, which can be a computational bottleneck for performing simulations of quantum chromodynamics...