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

Session

Hadron Production

10 Jun 2026, 09:50

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

52. Novel Azimuthal Observables from Two-Photon Collision at e+e- Colliders

Yajin Zhou

10/06/2026, 09:50

Novel Azimuthal Observables from Two-Photon Collision at e+e- Colliders

2. Fragmentation function study at BESIII

Isabella Garzia

10/06/2026, 10:10

Fragmentation Function (FF) plays a crucial role in describing the hadronization process, which is usually studied by investigating the inclusive production of final-state hadrons of interest. We report the measurements of normalized differential inclusive production cross, of neutral mesons $π^0$, $K_S^0$, η and charged particles $π^±$ and $K^±$, as a function of the hadron momentum at the...

42. Light Meson decays at BESIII

Kailu Liu

10/06/2026, 11:00

The world’s largest sample of J/ψ events accumulated at the BESIII detector offers a unique opportunity to investigate η and η′ physics via two body J/ψ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in η/η′ decays. A selection of recent highlights in light meson decays at BESIII are reviewed in this report, including the precision...

4. Measurement of the relative phase between strong and electromagnetic decays

Francesca De Mori (Universita' di Torino and INFN sez. di Torino)

10/06/2026, 11:20

The strong and electromagnetic interactions are two main decay mechanisms in charmonium decays. The relative phase between them is a basic parameter in understanding the decay dynamics, especially for the precise measurements. In this talk, we present the direct measurement with resonance scan method. By introducing the EM amplitude from continuum decay, the interference between EM and strong...

28. Three-body decays with Khuri-Treiman equations

Sergi Gonzalez-Solis (Universitat de Barcelona)

10/06/2026, 11:40

One of the main issues posed by the presence of hadrons in any reaction is their final-state interactions, which are formally expressed in terms of the unitarity of the amplitude. In two-body scattering, unitarity is usually imposed in the direct channel only, as one is not sensitive to the details of the crossed channels. This is certainly not the case for a three-body decay, where the three...

24. Towards an improved understanding of $a_1$ and $a_2$ transition form factors

Hannah Schäfer (Bern University)

10/06/2026, 12:00

The isovector axial-vector and tensor meson states $a_1$ and $a_2$ have garnered interest in the last years since they appear as intermediate states in the hadronic light-by-light (HLbL) scattering contribution to $(g-2)_\mu$. Their dynamical behaviour, including their transition form factors, is poorly understood to this day, which also affects the uncertainty budget of the HLbL...

36. Measurement of electromagnetic transition form factors in two-photon collisions at BESIII

Max Lellmann

10/06/2026, 12:20

Electromagnetic transition form factors of light mesons are important inputs to the calculations of the hadronic light-by-light scattering contribution to the Standard Model prediction of the anomalous magnetic moment of the muon. However, data in the relevant regions of momentum transfer are scarce. The BESIII experiment at the $e^+ e^-$ collider BEPCII has collected the world's largest data...