14th International Workshop on e⁺e⁻ collisions from Phi to Psi 2026

Session

Muon g-2 theo

9 Jun 2026, 11:00

Scuola Normale Superiore, Aula Dini, Palazzo del Castelletto (Pisa)

Conveners

Muon g-2 theo

• Aidan Wright (University of Liverpool)

26. Dispersive description of new subprocesses for tensor-meson contribution to muon g-2

Eirini Lymperiadou (PSI/UZH)

09/06/2026, 11:00

The uncertainties in the muon anomalous magnetic moment are dominated by the hadronic contributions, i.e. hadronic vacuum polarization (HVP) and hadronic light-by-light (HLbL) scattering. The discrepancies among different data sets of cross section within the data-driven dispersive method and with lattice QCD are still an open problem. This presentation focuses on the dispersive evaluation of...

27. Dispersive description of the $\gamma^*T\to\pi^+\pi^-$ subprocess and its role in muon $g-2$

Emilis Kaziukenas (University of Vienna)

09/06/2026, 11:20

One of the leading sources of uncertainty in the Hadronic Light-by-Light (HLbL) contribution to the muon $g-2$ is the tower of spin-2 resonances, beginning with the $f_2(1270)$. We present progress in evaluating these effects within a new dispersive framework in triangle kinematics, which permits a description of higher-spin states with reduced model dependence by representing the muon anomaly...

45. Two-potential parametrization to describe the pion vector form factor

Leon Heuser (HISKP - University Bonn)

09/06/2026, 11:40

A precise description of the pion vector form factor (VFF) requires not only high-quality data but also a consistent theoretical framework that captures the interplay of multiple hadronic channels. In this contribution, we focus on the construction of a dispersive model that explicitly incorporates inelastic effects beyond the elastic $\pi\pi$ channel, employing the two-potential formalism. It...

35. The pion vector form factor with explicit inelasticities

George Chanturia (HISKP, University of Bonn)

09/06/2026, 11:55

The pion vector form factor (VFF) offers the dominant contribution to the hadronic vacuum polarisation (HVP). The lasting tension between modern $e^+e^-$ data calls for a better theoretical understanding of the experimental situation, both in terms of accuracy and precision. To this day, most phenomenologic fits to the pion VFF are performed without explicit modelling of inelastic channels. We...

32. Calibrated study of the correlation between heavy-quark masses and HVP observables at the precision frontier

Antonio Rivera (IFAE)

09/06/2026, 12:10

The theoretical prediction of the muon $g-2$ depends crucially on the hadronic vacuum polarization (HVP), whose evaluation relies either on experimental data through dispersive relations or on lattice QCD calculations. Since the former probes the time-like region while the latter is formulated in the space-like region, their comparison cannot be performed locally, and the origin of the...

62. Data-driven results for the light-quark connected contribution to the muon g-2

Diogo Boito (University of Sao Paulo)

09/06/2026, 12:30

Reducing the uncertainty of the Standard Model $g-2$ determination is a crucial task. A key issue is the discrepancy between lattice-QCD and data-driven hadronic vacuum polarization (HVP) results. A path to resolve this discrepancy is the precise data-driven determination of the isospin-limit light-quark connected (lqc) and strange plus light-quark disconnected (s+lqd) components of the HVP...