54th International Symposium on Multiparticle Dynamics (ISMD 2026)

Session

Session 3

Collectivity and Multiparticle Dynamics

17 Aug 2026, 14:40

Conveners

Session 3

• Maya Shimomura (Nara Women's University (JP))

3. Multiparticle production in electron-positron annihilation

Prof. Elena Kokoulina (JINR)

17/08/2026, 14:40

7. Collectivity and Multiple Scattering

Oral presentation

Multiparticle production in hadron and lepton interactions still attracts our attention. Simulation by using Monte Carlo event generators is performed before planning any experiment. But it often overestimates (or underestimates) experimental data. These generators are based on the theory of strong interactions, quantum chromodynamics (QCD), which is capable of performing calculations only in...

93. Investigating Collectivity and Strangeness Enhancement in e+e- collisions

Yen-Jie Lee (Massachusetts Inst. of Technology (US))

17/08/2026, 15:05

7. Collectivity and Multiple Scattering

Invited talk

Ridge-like correlations and strangeness enhancement observed in high-multiplicity hadronic collisions motivate searches in the much smaller and cleaner environment of $e^{+}e^{-}$ annihilation. In this talk, we summarize two-particle correlation results from Belle and ALEPH, including a recent ALEPH study using a $W^{+}W^{-}$-enhanced selection that accesses higher-multiplicity multijet final...

18. Search for long-range di-hadron correlations in high multiplicity $p$+$p$ collisions at $\sqrt{s}=200$~GeV with STAR

Prithwish Tribedy (for the STAR Collaboration) (Brookhaven National Lab)

17/08/2026, 15:30

7. Collectivity and Multiple Scattering

Oral presentation

The observation of long-range correlations in high-multiplicity $p$+$p$ collisions at the LHC sparked wide interest in the potential collectivity of small systems. However, a comparable dedicated search in $p$+$p$ at RHIC energies ($\sqrt{s}=200$~GeV) was not feasible until recently due to trigger and luminosity constraints. In 2024, the STAR experiment collected a unique, high-statistics...

29. Differential measurements of $\phi$-meson global spin alignment and off-diagonal spin density matrix elements in Au+Au collisions at STAR (remote)

Zhenyu Ye (Lawrence Berkeley National Lab. (US))

17/08/2026, 15:55

7. Collectivity and Multiple Scattering

Oral presentation

A significant global spin alignment ($\rho_{00}$) signal for $\phi$-mesons was observed by the STAR collaboration in Au+Au collisions using the data from the first phase of the Beam Energy Scan at RHIC (BES-I) [1]. Conventional physical mechanisms which contribute to $\rho_{00}$ fail to explain the observed signal; however, it may be attributable to the presence of a $\phi$-meson strong force...