-
8/3/26, 9:20 AM
-
8/3/26, 9:30 AM
-
Swagato Banerjee (University of Louisville)8/3/26, 9:50 AM
Events from the $e^+e^- \to \mu^+\mu^-$ process are cleanly identifiable at the Belle II experiment. To simulate the $e^+e^- \to \pi^+\pi^-$ process, angular distributions from a final state of two spin-1/2 particles can be reweighted to a final state of two pseudoscalar particles using the KK2F Monte Carlo generator. Variations in photon radiation, evaluated using the Collins-Soper and...
Go to contribution page -
Léonard Polat (CPPM)8/3/26, 10:50 AM
-
Lorenzo Punzi (Scuola Normale Superiore and INFN Pisa)8/3/26, 11:15 AM
-
Riccardo Aliberti (JGU Mainz)8/3/26, 11:45 AM
-
Fulvio Piccinini (INFN Pavia and GGI Arcetri)8/3/26, 2:45 PM
The development of precise event generators for $e^+$ $e^-$ colliders
Go to contribution page
and a thorough assessment of the uncertainties associated with the
Monte Carlo simulations are the essential ingredients for sound estimates
of the muon anomalous magnetic moment with the data-driven approach.
A general overview of the RadioMonteCarLow 2 effort is presented with an
update on recent developments. -
Sophie Kollatzsch (PSI / UZH)8/3/26, 3:15 PM
With McMule, fully differential predictions for the radiative process $e^+e^-\to\mu^+\mu^-\gamma$ including NNLO initial-state corrections are now available.
Furthermore, we also calculate $e^+e^-\to\pi^+\pi^-\gamma$ at NLO by applying form-factor scalar QED wherever it is physically justified. By considering additional contributions, we gain insights into the associated theory...
Go to contribution page -
Marco Ghilardi (University of Pavia-INFN Section of Pavia)8/3/26, 4:10 PM
To resolve the tension between lattice QCD and data-driven evaluations of the hadronic
Go to contribution page
vacuum polarization contribution to the muon anomaly $a_\mu$, precise cross-section measurements
of the dominant $\pi^+\pi^-$ channel are highly relevant. The radiative return process
$e^+e^- \to \pi^+\pi^-\gamma$ at flavor factories is essential for extracting this
cross section below... -
William Torres Bobadilla (University of Liverpool)8/3/26, 4:40 PM
In this talk, we present recent progress in extending PHOKHARA beyond NLO precision. First, we report new results for the pion-pair channel, incorporating the Generalised Vector Dominance Model as an improvement over the usual point-like treatment of pions. We then present the implementation of soft-photon resummation and discuss ongoing work on additional next-to-next-to-leading-order (NNLO)...
Go to contribution page -
Aidan Wright (University of Liverpool)8/4/26, 9:00 AM
Significant tensions impede dispersive evaluations of hadronic vacuum polarisation (HVP) contributions to the muon anomalous magnetic moment $a_\mu$. I will give a progress update discussing improvements to the still blinded KNTW (Keshavarzi-Nomura-Teubner-Wright) HVP analysis procedure, the results from which will form a critical component of future $a_\mu$ evaluations.
Go to contribution page -
Bogdan Malaescu (LPNHE, CNRS), Vladimir Pascalutsa8/4/26, 9:30 AM
-
Leon Heuser (HISKP, University of Bonn)8/4/26, 10:20 AM
-
Christoph Florian Redmer (JGU Mainz)8/4/26, 2:00 PM
According to the conserved vector current theorem, the tau lepton decays could be utilized to calculate the hadronic vacuum polarization (HVP) contribution to the muon anomaly. For example, the decay rate of tau -> 2pi nu is related to the cross section of e+e- -> pi+pi- which gives the dominant contribution to the HVP at low energies. Operating in the tau–charm energy region and having...
Go to contribution page -
Mattia Bruno (Univesita' di Milano-Bicocca)8/4/26, 2:25 PM
-
5. Comparison of the hadronic vacuum polarization between hadronic $\tau$-decay data and the latticeMaarten Golterman (San Francisco State University)8/4/26, 2:55 PM
We compare the isospin-one hadronic vacuum polarization (HVP) obtained from isospin-symmetric lattice QCD with that obtained from a dispersive representation employing inclusive hadronic $\tau$ decay data corrected for isospin breaking. We consider the subtracted HVP evaluated at momenta ranging from $0.5$ GeV$^2$ to $12$~GeV$^2$, together with the light-quark-connected HVP contribution to the...
Go to contribution page -
Martin Hoferichter (University of Bern)8/4/26, 3:55 PM
-
8/4/26, 4:15 PM
-
Gabriel Lopez Castro (Departamento de Fisica, Cinvestav, Mexico)8/4/26, 4:40 PM
-
Takashi Yamanaka (Kyushu University)8/5/26, 9:00 AM
-
Hogan Nguyen (Fermilab)8/5/26, 9:30 AM
With the publication of our final result on $a_{\mu}$, the collaboration is focussing on three Beyond the Standard Model (BSM) searches. They are searches for a muon EDM, an Ultralight Scalar DM, and violation of CPT and Lorentz Invariance. These analyses are built upon the $a_{\mu}$ data products and are nearing completion. I will review the physics signatures, the systematic errors, and...
Go to contribution page -
Bálint Tóth (University of Wuppertal)8/5/26, 10:30 AM
We present a complete calculation of the hadronic vacuum polarization contribution to the muon magnetic anomaly reaching the sub-5‰ precision level. Our result, recently published in Nature, constitues an unprecedented validation of the Standard Model, at the given accuracy, in explaining the experimental measurement world average of $a_\mu$, agreeing with the latter at 0.5 standard...
Go to contribution page -
Simone Romiti (University of Bern)8/5/26, 11:00 AM
In this talk we review the status of the lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution to $a_\mu=(g-2)_\mu$ from the ETM collaboration.
Go to contribution page
Our result includes the effects of the $u,d,s,c$ quarks in the isospin-symmetric limit of QCD. Our ensembles are generated with $N_f=2+1+1$ dynamical flavors through Wilson-clover twisted mass fermions, and our correlators are... -
Shaun Lahert (University of Utah)8/5/26, 11:30 AM
-
Arnau Beltran (JGU Mainz)8/5/26, 12:00 PM
We present the Mainz update on the determination of the hadronic vacuum polarization contribution to the muon $g-2$. We discuss ongoing improvements to our dataset and ensemble set aimed at better constraining the chiral–continuum extrapolation, as well as our efforts toward a complete estimate of isospin-breaking effects. In addition, we report on our progress in the determination of...
Go to contribution page -
Julian Parrino (Universität Regensburg)8/5/26, 2:00 PM
-
Khai Phan (ETH Zurich)8/5/26, 2:30 PM
-
Vaishakhi Moningi (University of Connecitcut)8/5/26, 3:00 PM
-
Kohtaroh Miura (University of Tsukuba)8/5/26, 4:00 PM
I will report on the launch of the lattice QCD project by the PACS Collaboration (PACSc) for muon g-2 precision physics in collaboration with the J-PARC experiments. Using the Fugaku supercomputer, the PACSc has generated PACS10 gauge ensembles by adopting the stout-smeared O(a) improved Wilson-clover quark action and the Iwasaki gauge action at the physical pion/kaon masses on the lattice...
Go to contribution page -
Davide Giusti (Forschungszentrum Jülich)8/5/26, 4:15 PM
The lattice scale setting already represents, and will increasingly become in the future, one of the leading sources of uncertainty in first-principles calculations of the HVP contribution to $(g_\mu-2)$.
Go to contribution page
In this talk, I will discuss the procedure adopted in the BMW/DMZ collaboration calculation, which currently provides the most precise Standard Model determination of the muon anomalous... -
Sebastian Lahrtz8/5/26, 4:30 PM
Isospin-breaking corrections to the hadronic vacuum polarisation
Go to contribution page
contribution to the muon g-2 dominate the error of recent lattice
calculations. It is therefore crucial to reduce the uncertainties
coming from these contributions to reach the overall target
precision. I will present preliminary results from a new calculational
setup that improves the statistical precision for constant... -
Christoph Lehner (University of Regensburg)8/5/26, 4:45 PM
-
Jake Sitison (University of Colorado Boulder)8/5/26, 5:00 PM
Chiral perturbation theory ($\chi$PT) is the effective field theory (EFT) of QCD at low energies and is routinely used to complement lattice QCD analyses. EFT matching can be used to relate objects, such as operators and correlators, in the UV theory (QCD) to those in the IR EFT ($\chi$PT). In this talk, we present a charge matrix spurion analysis to match diagrams with external vector...
Go to contribution page -
Andrey Kupich (BINP)8/6/26, 9:00 AM
New results of the $e^+e^- \to \pi^+\pi^-$ and $e^+e^- \to \pi^+\pi^-\pi^0$ cross section measurements, performed by SND collaboration.
Go to contribution page -
8/6/26, 9:20 AM
-
Alessandro Conigli (JGU Mainz)8/6/26, 10:15 AM
Precision measurements provide a powerful probe of physics beyond the Standard Model, but their sensitivity is often limited by our ability to control hadronic effects. In this talk, I will focus on the hadronic contribution to the running of the electroweak gauge couplings, with particular emphasis on $\Delta\alpha_{\mathrm{had}}^{(5)}(M_Z^2)$.
I will present a recent high-precision...
Go to contribution page -
Anton Shcherbakov (UCONN)8/6/26, 11:15 AM
We will provide an update to the RBC-UKQCD collaborations on the lattice calculation of the position-space, long-distance $\pi^0$ exchange part of the HLbL contribution to the anomalous magnetic moment of the muon. We will present the results of the calculation from 48I and 64I gauge-field ensembles at $a^{-1}=1.73$ GeV and $a^{-1}=2.359$ GeV, respectively. Additionally, we will present the...
Go to contribution page -
Domink Erb (Johannes Gutenberg University Mainz)8/6/26, 11:45 AM
We present an update to the Mainz effort on the HLbL contribution to the muon $(g-2)$. We extended the number of ensembles for the calculation of the pion transition from factor $\mathcal{F}_{\pi^0 \gamma^* \gamma^*}$. This especially includes the disconnected diagrams. The form factor is the main ingredient in the calculation of the pion-pole contribution to the HLbL.
Go to contribution page
We will also show a new... -
Khai Phan (ETH Zurich)8/6/26, 12:15 PM
Within the RC* programme, we are working towards an independent lattice calculation of the hadronic light-by-light (HLbL) contribution to the muon $g$-2, with $C^\star$ boundary conditions using openQxD. As a proof of concept, we compute the analogous leptonic light-by-light contribution in quenched QED at large coupling, benchmarked against the perturbative Laporta–Remiddi result, and present...
Go to contribution page -
Christian Zimmermann (University of Kentucky)8/6/26, 2:00 PM
We calculate the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon using staggered fermions at the physical point. This is done by evaluating four-point functions in position space using a method based on the idea by the Mainz group, which is adapted to staggered fermions. Our calculation is carried out for several physical volumes and lattice...
Go to contribution page -
Urs Wenger (University of Bern)8/6/26, 2:30 PM
We present results for the hadronic light-by-light (HLbL) contribution from lattice-QCD calculations based on ETMC's Nf=2+1+1 Wilson-clover twisted-mass ensembles at the physical point. These include continuum extrapolations for the strange- and charm-quark connected contributions and results for the light-quark connected and 2+2 disconnected contributions at two lattice spacings.
Go to contribution page -
8/7/26, 9:00 AM
-
Max Lellmann (JGU Mainz)8/7/26, 9:30 AM
Data-driven evaluations of the hadronic light-by-light contribution to the muon anomalous magnetic moment rely critically on precise experimental inputs. This talk presents recent and ongoing measurements from the BESIII experiment specifically targeted to constrain these theoretical frameworks. Utilizing the large $e^+e^-$ datasets collected at the BEPCII collider, we extract single- and...
Go to contribution page -
Hartmut Wittig8/7/26, 11:45 AM
-
Siyuan Li (Johannes Gutenberg-Universität Mainz (JGU))8/7/26, 12:15 PM
We study a linear combination of $a_e$ and $a_\mu$ that utilizes the strong correlation between the hadronic contributions to both anomalous magnetic moments. This subtracted observable potentially reduces the uncertainties associated with higher energy contributions, and may help address the current discrepancy between lattice and data-driven evaluations, through improved measurements of...
Go to contribution page -
Kilian Möhling (TU Dresden, Institut für Kern- und Teilchen Physik)8/7/26, 2:00 PM
In the past decades, the muon g-2 has attracted a lot of attention as a powerful probe
Go to contribution page
of physics beyond the Standard Model. However, in light of the updated SM value and
final result of the Fermilab measurement, its impact on a wide range of BSM scenarios
has to be reevaluated.
In this talk I discuss how g-2 connects to a number of complementary observables
relevant in searches for new... -
William Torres Bobadilla (University of Liverpool)
Choose timezone
Your profile timezone: