Antonin Portelli
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View article: QEDr: a finite-volume QED action with redistributed spatial zero-momentum modes
QEDr: a finite-volume QED action with redistributed spatial zero-momentum modes Open
A bstract We present a finite-volume QED action designed to improve the infinite-volume extrapolation of hadronic observables in precision lattice QCD+QED calculations. The action proposed in this work, which we call QED r , can be seen as…
View article: Weak decays and finite-volume QED
Weak decays and finite-volume QED Open
View article: Exploratory calculation of the rare hyperon decay Σ+ → pℓ+ℓ− from lattice QCD
Exploratory calculation of the rare hyperon decay Σ+ → pℓ+ℓ− from lattice QCD Open
A bstract The rare hyperon decay Σ + → pℓ + ℓ − is a flavour-changing neutral current process mediated by an s → d transition that occurs only at loop level within the Standard Model. Consequently, this decay is highly suppressed, making i…
View article: Physical-mass calculation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>770</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>*</mml:mo></mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>892</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> resonance parameters via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi><mml:mi>π</mml:mi></mml:math> scattering amplitudes from lattice QCD
Physical-mass calculation of and resonance parameters via and scattering amplitudes from lattice QCD Open
We present our study of the ρ(770) and K*(892) resonances from lattice quantum chromodynamics (QCD) employing domain-wall fermions at physical quark masses. We determine the finite-volume energy spectrum in various momentum frames and obta…
View article: Light and Strange Vector Resonances from Lattice QCD at Physical Quark Masses
Light and Strange Vector Resonances from Lattice QCD at Physical Quark Masses Open
We present the first calculation at physical quark masses of scattering amplitudes describing the lightest pseudoscalar mesons interacting via the strong force in the vector channel. Using lattice quantum chromodynamics, we postdict the de…
View article: Split-even approach to the rare kaon decay $K \to π\ell^+ \ell^-$
Split-even approach to the rare kaon decay $K \to π\ell^+ \ell^-$ Open
In recent years the rare kaon decay has been computed directly at the physical point. However, this calculation is currently limited by stochastic noise stemming from a light and charm quark loop GIM subtraction. The split-even approach is…
View article: $\text{QED}_\text{r}$: a finite-volume QED action with redistributed spatial zero-momentum modes
$\text{QED}_\text{r}$: a finite-volume QED action with redistributed spatial zero-momentum modes Open
We present a finite-volume QED action designed to improve the infinite-volume extrapolation of hadronic observables in precision lattice QCD+QED calculations. The action proposed in this work, which we call $\text{QED}_\text{r}$, can be se…
View article: Towards a high-precision description of the ρ and K* resonances
Towards a high-precision description of the ρ and K* resonances Open
We summarise our determination of the $\\rho$ and $K^*$ resonance parameters from lattice QCD at a physical pion mass. The methods for computing correlation functions and extracting energy levels from an RBC-UKQCD domain-wall fermion ensem…
View article: FLAG Review 2024
FLAG Review 2024 Open
We review lattice results related to pion, kaon, $D$-meson, $B$-meson, and nucleon physics with the aim of making them easily accessible to the nuclear and particle physics communities. More specifically, we report on the determination of …
View article: High precision calculation of the hadronic vacuum polarisation contribution to the muon anomaly
High precision calculation of the hadronic vacuum polarisation contribution to the muon anomaly Open
We present a new lattice QCD calculation of the leading order hadronic vacuum polarization contribution to the muon anomalous magnetic moment $a_μ$. We reduce uncertainties compared to our earlier computation by $40\%$, arXiv:2002.12347. W…
View article: Lattice dataset for the paper "Physical-mass calculation of $\rho(770)$ and $K^*(892)$ resonance parameters via $\pi \pi$ and $K \pi$ scattering amplitudes from lattice QCD"
Lattice dataset for the paper "Physical-mass calculation of $\rho(770)$ and $K^*(892)$ resonance parameters via $\pi \pi$ and $K \pi$ scattering amplitudes from lattice QCD" Open
Release for publications, currently available as arxiv preprints: arXiv:2406.19193: Physical-mass calculation of $\rho(770)$ and $K^*(892)$ resonance parameters via $\pi \pi$ and $K \pi$ scattering amplitudes from lattice QCD arXiv:2406.19…
View article: Light and strange vector resonances from lattice QCD at physical quark masses
Light and strange vector resonances from lattice QCD at physical quark masses Open
We present the first ab initio calculation at physical quark masses of scattering amplitudes describing the lightest pseudoscalar mesons interacting via the strong force in the vector channel. Using lattice quantum chromodynamics, we postd…
View article: Structure-dependent electromagnetic finite-size effects
Structure-dependent electromagnetic finite-size effects Open
We present a model-independent and relativistic approach to analytically derive electromagnetic finite-size effects beyond the point-like approximation. The key element is the use of electromagnetic Ward identities to constrain vertex func…
View article: Structure-dependent electromagnetic finite-volume effects through order $1/L^3$
Structure-dependent electromagnetic finite-volume effects through order $1/L^3$ Open
We consider electromagnetic finite-volume effects through order 1/L3 in different formulations of QED, where L is the periodicity of the spatial volume.An inherent problem at this order is the appearance of structure-dependent quantities r…
View article: Structure-dependent electromagnetic finite-volume effects through order $1/L^3$
Structure-dependent electromagnetic finite-volume effects through order $1/L^3$ Open
We consider electromagnetic finite-volume effects through order $1/L^3$ in different formulations of QED, where $L$ is the periodicity of the spatial volume. An inherent problem at this order is the appearance of structure-dependent quanti…
View article: Prospects for a lattice calculation of the rare decay Σ+ → pℓ+ℓ−
Prospects for a lattice calculation of the rare decay Σ+ → pℓ+ℓ− Open
A bstract We present a strategy for calculating the rare decay of a Σ + ( uus ) baryon to a proton ( uud ) and di-lepton pair using lattice QCD. To determine this observable one needs to numerically evaluate baryonic two-, three-, and four…
View article: Towards $K\pi$ scattering with domain-wall fermions at the physical point using distillation
Towards $K\pi$ scattering with domain-wall fermions at the physical point using distillation Open
Resonances play an important role in Standard Model phenomenology. In particular, hadronic resonances feature in $B$ and $D$ decays, which can be central for New Physics searches. Lattice QCD simulations combined with the finite-volume met…
View article: Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses
Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses Open
A bstract The decreasing uncertainties in theoretical predictions and experimental measurements of several hadronic observables related to weak processes, which in many cases are now smaller than O(1%), require theoretical calculations to …
View article: Efficiently unquenching QCD+QED at $\mathrm{O}(\alpha)$
Efficiently unquenching QCD+QED at $\mathrm{O}(\alpha)$ Open
We outline a strategy to efficiently include the electromagnetic interactions of the sea quarks in QCD+QED.\nWhen computing iso-spin breaking corrections to hadronic quantities at leading order in the electromagnetic coupling, the sea-quar…
View article: Position-Space Renormalisation of the Energy-Momentum Tensor
Position-Space Renormalisation of the Energy-Momentum Tensor Open
There is increasing interest in the study of nonperturbative aspects of three-dimensional quantum field theories (QFT). They appear as holographic dual to theories of (strongly coupled) gravity. For instance, in Holographic Cosmology, the …
View article: Exploring distillation at the SU(3) flavour symmetric point
Exploring distillation at the SU(3) flavour symmetric point Open
In these proceedings we present an exact distillation setup with stabilised Wilson fermions at the SU(3) flavour symmetric point utilising the flexibility of the Grid and Hadrons software libraries. This work is a stepping stone towards a …
View article: Progress on the exploratory calculation of the rare Hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$
Progress on the exploratory calculation of the rare Hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$ Open
The rare Hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$ is an $s \to d$ flavour changing neutral current process, which is highly suppressed within the Standard Model, and is therefore sensitive to new physics. Due to recent improvements in …
View article: Simulating rare kaon decays <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math> using domain wall lattice QCD with physical light quark masses
Simulating rare kaon decays using domain wall lattice QCD with physical light quark masses Open
We report the first calculation using physical light-quark masses of the electromagnetic form factor V(z) describing the long-distance contributions to the K+→π+ℓ+ℓ- decay amplitude. The calculat…
View article: Efficiently unquenching QCD+QED at O($α$)
Efficiently unquenching QCD+QED at O($α$) Open
We outline a strategy to efficiently include the electromagnetic interactions of the sea quarks in QCD+QED. When computing iso-spin breaking corrections to hadronic quantities at leading order in the electromagnetic coupling, the sea-quark…
View article: Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point
Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point Open
We report on the physical-point RBC/UKQCD calculation of the leading isospin-breaking corrections to light-meson leptonic decays. This is highly relevant for future precision tests in the flavour physics sector, in particular the first-row…
View article: Progress on the exploratory calculation of the rare Hyperon decay $Σ^+ \to p \ell^+ \ell^-$
Progress on the exploratory calculation of the rare Hyperon decay $Σ^+ \to p \ell^+ \ell^-$ Open
The rare Hyperon decay $Σ^+ \to p \ell^+ \ell^-$ is an $s \to d$ flavour changing neutral current process, which is highly suppressed within the Standard Model, and is therefore sensitive to new physics. Due to recent improvements in exper…
View article: Position-Space Renormalisation of the Energy-Momentum Tensor
Position-Space Renormalisation of the Energy-Momentum Tensor Open
There is increasing interest in the study of nonperturbative aspects of three-dimensional quantum field theories (QFT). They appear as holographic dual to theories of (strongly coupled) gravity. For instance, in Holographic Cosmology, the …
View article: Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point
Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point Open
We report on the physical-point RBC/UKQCD calculation of the leading isospin-breaking corrections to light-meson leptonic decays. This is highly relevant for future precision tests in the flavour physics sector, in particular the first-row…
View article: Towards $Kπ$ scattering with domain-wall fermions at the physical point using distillation
Towards $Kπ$ scattering with domain-wall fermions at the physical point using distillation Open
Resonances play an important role in Standard Model phenomenology. In particular, hadronic resonances feature in $B$ and $D$ decays, which can be central for New Physics searches. Lattice QCD simulations combined with the finite-volume met…
View article: Exploring distillation at the SU(3) flavour symmetric point
Exploring distillation at the SU(3) flavour symmetric point Open
In these proceedings we present an exact distillation setup with stabilised Wilson fermions at the SU(3) flavour symmetric point utilising the flexibility of the Grid and Hadrons software libraries. This work is a stepping stone towards a …