Conveners
Hadronic contribution to the magnetic moment of muon
- Finn Stokes (The University of Adelaide)
Hadronic contribution to the magnetic moment of muon
- Marina Krstic Marinkovic (ETH Zurich)
Hadronic contribution to the magnetic moment of muon
- Christoph Lehner (University of Regensburg)
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Arnau Beltran (JGU Mainz)03/11/2025, 14:30Talk
We compute the next-to-leading order (NLO) hadronic vacuum polarisation (HVP) contribution to the muon anomalous magnetic moment, $a_\mu^{\mathrm{hvp}}[\mathrm{NLO}]$ in lattice QCD. The kernel functions required for the three NLO diagrams are considered in the time-momentum representation (TMR), following the methodology of Balzani, Laporta, and Passera. For higher-order (HO) corrections...
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Alessandro Conigli03/11/2025, 14:50Talk
We present an updated determination of the hadronic vacuum polarization contribution to the running of the electromagnetic coupling $\Delta\alpha_{\mathrm{had}}^{(5)}(-Q^2)$, and of the electroweak mixing angle in the space-like momentum range up to $ 12 \ \mathrm{GeV}^2$. Using $N_f=2+1$ CLS ensembles at five lattice spacings and several pion masses, including the physical point, we...
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Vaishakhi Moningi (University of Connecticut)03/11/2025, 15:10Talk
We present an update on our determination of the light-quark connected contribution to the hadronic vacuum polarization (HVP) of the muon anomalous magnetic moment, $a_\mu$, on a finer lattice with 2+1+1 highly-improved staggered quark (HISQ) ensemble from the MILC collaboration with physical pion mass, 0.042 fm lattice spacing, and size $144^3 \times 288$ sites. Within the low-mode averaging...
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Christoph Lehner (University of Regensburg)03/11/2025, 15:30Talk
I present the current status of the RBC/UKQCD HVP program and will give an outlook on the remaining steps for matching the Fermilab E989 experimental precision.
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Julian Parrino (University of Regensburg)03/11/2025, 15:50Talk
In the recent muon g-2 white paper update, the hadronic vacuum polarization (HVP) contribution⸺which dominates the theoretical uncertainty⸺is evaluated as an average of different lattice QCD calculations. Since lattice simulations are mostly carried out in isospin symmetric QCD, corrections due to the mass difference of the up and down quarks and the coupling to photons have to be accounted...
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Nikolaos Kalntis (University of Bern)03/11/2025, 16:40Talk
We present updated results for the hadronic light-by-light (HLbL) contribution to the muon anomalous magnetic moment. The calculations are based on ETMC's $N_f = 2+1+1$ Wilson-clover twisted-mass ensembles at the physical point. We perform continuum extrapolations for the strange- and charm-quark connected contributions, and report on our results for the light-quark connected and light-light...
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Shaun Lahert03/11/2025, 17:00Talk
We present a progress update on the Fermilab Lattice, HPQCD, and MILC collaboration's ongoing effort to compute the hadronic vacuum polarization (HVP) contribution to the muon g-2. In particular, we describe the current status for the dominant isospin-symmetric leading order HVP quantities, namely the connected light-, strange-, and charm-quark contributions, including new data on our finest...
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Jacob Sitison (University of Colorado Boulder)03/11/2025, 17:20Talk
An ongoing project of the Fermilab Lattice, HPQCD, and MILC collaborations is the precision calculation of the hadronic vacuum polarization (HVP) contribution to the anomalous magnetic moment of the muon. In this talk, we present the isospin breaking corrections to the connected and disconnected contributions to HVP with a focus on the dominant, long-distance contributions to these correction....
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115. Factorizing the position space photon propagator for electromagnetic corrections to $(g-2)_\mu$Dominik Erb03/11/2025, 17:40Talk
Electromagnetic corrections to n-point functions on the lattice can be calculated by using a position space photon propagator. In this representation the propagator depends on the difference between the two vertices connected by the internal photon, leading to a volume square sum. The sum can be avoided by fixing one of the vertices to a single point with the downside of drastically reducing...
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Antonio Evangelista (University and INFN of Rome Tor Vergata)03/11/2025, 18:00Talk
We present results by ETMC on the leading-order hadronic vacuum polarisation (LO-HVP) contribution to the muon anomalous magnetic moment within isospin symmetric $N_f=2+1+1$ QCD. In our computation, we use Wilson–clover twisted-mass quarks in a sequence of simulations at large volumes, realistic pion masses, four lattice spacings and two different valence-quark regularisations for the...
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Mattias Sjö (CPT Marseille)04/11/2025, 14:50Talk
Hadronic vacuum polarization is a key observable in low-energy QCD, and is famously the greatest contributor to theoretical uncertainty in the muon magnetic moment. Its long-distance part in particular is a weak point of the current best lattice QCD computations. We compute it to next-to-next-to-next-to-leading order in chiral perturbaion theory, capturing the lowest-energy hadronic...
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Adrián del Pino Rubio (University of Zaragoza)04/11/2025, 15:10Talk
We present progress towards a new determination of the hadronic vacuum polarization (HVP) function $\Pi(Q^2)$ relevant for the running of the electromagnetic coupling and the electroweak mixing angle. In the conventional time–momentum representation, strong correlations induced by the kernel prevent reliable continuum extrapolations. To address this issue, we reconstruct smeared spectral...
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Marina Krstic Marinkovic (ETH Zurich)04/11/2025, 15:30Talk
Isospin-breaking corrections to the HVP are among the leading sources of uncertainty in the Standard Model prediction of the muon g−2 [1]. In recent work by the RC* collaboration [1], we compute the intermediate window contribution for a flavour non-singlet current using two strategies to include isospin-breaking corrections: the RM123 approach and a fully dynamical QCD+QED simulation. In both...
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Martin Hoferichter04/11/2025, 15:50Talk
Control over isospin-breaking corrections is an important requisite for the evaluation of hadronic contributions to the anomalous magnetic moment of the muon, both regarding the isospin rotation of hadronic tau decays and the comparison of data-driven evaluations of hadronic vacuum polarization with lattice QCD. In both cases, a key point concerns the definition of the isospin scheme. I will...
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