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

Session

Charm & Quarkonium

8 Jun 2026, 14:30

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

39. Study of $\chi_{b1,2}(2P)\to \omega\Upsilon(1{\mathrm{S}})$ transitions in $\Upsilon(3S)\to \gamma\,\chi_{b1,2}(2P)$ decays at $BABAR$

Guy Wormser (IJCLab Orsay)

08/06/2026, 14:30

We present the result of a study of the transitions $\chi_{b1,2}(2P)\to \omega\Upsilon(1{\mathrm{S}})$, with $\chi_b$ mesons produced in $e^+e^−\to \Upsilon(3S)\to\gamma\,\chi_{b1,2}(2P)$ reactions. The data were collected with the $BABAR$ detector at the PEP-II asymmetric-energy $e^+e^−$ collider, at the peak of the $\Upsilon(3S)$ resonance. The integrated luminosity of the data sample is...

6. Study of Charmonium-like States via e⁺e⁻ → Hidden Charm Final States at BESIII

Maoqiang Jing

10/06/2026, 12:40

The BESIII experiment, with its unique data samples in the √s = 4.0 – 4.95 GeV region, continues to provide inputs for understanding charmonium and exotic XYZ states. This talk presents three recent analyses of processes with hidden charm in the final state. We report the search for a charmonium-like state ψ₀(4360) J^{PC} = 0^{--} via e⁺e⁻ → ηψ₀(4360) → ηηψ(2S), conducted at the center-of-mass...

61. P-wave charmonium contribution to hidden-charm states from reanalysis of lattice QCD data

Pan-Pan Shi (Instituto de Física Corpuscular (IFIC))

11/06/2026, 12:25

We reanalyze, considering the contribution of $P$-wave charmonia, lattice data for the $D \bar D$-$D_s \bar D_s$ coupled-channel of S. Prelovsek et al. [JHEP 06, 035 (2021)] and $D \bar{D}{}^\ast$ systems of S. Prelovsek et al. [Phys. Rev. Lett. 111, 192001 (2013)] with $m_{\pi}\simeq 280$ and $266$ MeV, and $L=24a/32a$ ($a\simeq 0.09$ fm) and $L=16a$ ($a\simeq0.1239(13)$ fm), respectively....

22. Measurements of charm hadrons at Belle and Belle II

Sanjeeda Bharati Das (Universita di Torino)

11/06/2026, 14:30

The Belle and Belle II experiments have collected a $1.6~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at center-of-mass energies near the $\Upsilon(nS)$ resonances. These samples contain a large number of $e^+e^-\to c\bar{c}$ events that produce charmed mesons and baryons. We present new results including the observation of the radiative decay $D_s(2317)^+ \to D_s^* \gamma$, a search...

7. Recent Progresses on η_c(1S) Decays at BESIII

Xueqiang Yan

11/06/2026, 14:50

The lowest-mass charmonium ground state, the η_c(1S), serves as a crucial laboratory for testing quantum chromodynamics (QCD) and understanding charmonium decay dynamics. Utilizing its world-leading data samples of J/ψ and ψ(3686) events, the BESIII experiment has recently achieved significant progresses in the study of η_c decays. This presentation will report three key results. First, we...

25. Search for charm rare decays at BESIII

XiaoKang Li

11/06/2026, 15:10

The BESIII experiment has collected 10 billion $J/ψ$ events and 2.7 billion $ψ(3686)$ events. The huge charmonium data samples allow us to search for rare decay processes allowed in the standard model and new physics beyond the standard model.
In this talk, we report the search for charged lepton flavor violation process ψ(3686)→eμ, charmonium weak decay processes $J/ψ→γD^0$, $J/ψ→D^0μ^+μ^-$,...