12th International Workshop on Charm Physics (CHARM 2025)

Session

Parallel I: B

12 May 2025, 16:15

Tsung-Dao Lee Institute

Conveners

Parallel I: B

• Jianyong Zhang (IHEP)

32. Exploring Nucleon Structure through radiative decay of J/\psi

吉/Ji 徐/Xu (兰州大学)

12/05/2025, 16:15

We propose to investigate short-range correlations (SRCs) in nuclei by studying sub-threshold photoproduction of ϕ particles in an electron-positron collision experiment. We present a direct experimental signature for SRCs, which is deemed achievable using the Beijing Spectrometer III (BESIII). The cross sections for sub-threshold production, as well as the likelihood of detection by BESIII,...

15. A dynamical link between $D^0-\bar{D}^0$ mixing and chiral symmetry breaking

Dr Hiroyuki Umeeda (Jilin University)

12/05/2025, 16:35

For charm mixing, it is known that the lowest order analysis in the operator product expansion (OPE) does not reproduce the experimental data, indicating the importance of power-suppressed corrections. In particular, contributions induced by quark condensates are discussed as possible sources of enhancement in the previous works. Those investigations generically imply that chiral symmetry...

21. Perturbative QCD Evidence for Spin-2 Particles in the Di-$J/\psi$ Resonances

Hong-Fei Zhang (Guizhou University of Finance and Economics)

12/05/2025, 16:55

We extend the nonrelativistic QCD framework to explore the nature of the newly discovered di-$J/\psi$ resonances. Assuming them as either molecule-like states or tetraquarks, we calculated their hadroproduction cross sections at the LHC. We find that the observed resonances are most likely spin-2 particles, and there should exist their spin-0 counterparts near these resonances. The ratio of...

26. Updated Vector Meson Dominance model predictions for $\psi \to l^+l^- \pi^0$ ($l=e, \mu$) including $\rho-\omega$ interference

Vindhyawasini Prasad (Jilin University)

12/05/2025, 17:15

Recent BESIII measurement of $J/\psi \to e^+e^-\pi^0$ has revealed a significant $\rho$-$\omega$ interference pattern in the di-electron invariant mass spectrum. This observed pattern is qualitatively similar to that of the pion form factor but features a relatively narrow $\rho$ resonance. Motivated by this observation, we present updated Vector Meson Dominance (VMD) predictions for the rare...

66. Precise measurement of CP violating tau EDM through e +e- -> γ* , ψ(2s) → τ +τ -

子月/Zi-Yui 邹/Zou

12/05/2025, 17:35

A nonzero electric dipole moment of a tauon, $d_{\tau}$, signals CP violation and provides an important probe for new physics. We study methods to measure $d_{\tau}$ at low energy $e^+e^-$ colliders through the processes $e^+e^- \to \gamma^*, \psi(2S) \to \tau^+\tau^-$ with $\tau^{\pm}$ decays into a charged hadron and a tau neutrino. We point out that, with measuring energies of the charged...

113. Studying scalar mesons with SU(3) flavor symmetry in J/psi decays

Xiao Yu

12/05/2025, 17:50

The scalar mesons are established for a long time, but their nature is still an open question. In this slide, we investigate the potential of categorizing their SU(3)f representations via J/ψ → SV and γS, offering a criterion that may illuminate this issue. Here, S (V ) denotes scalar (vector) mesons. Using the SU(3)f symmetry with the current data, we find that f0(500) and f0(980) are mostly...