Fri·Jun 9, 2023Friday·June 9, 2023

1. 01*

   Long-range correlations in low-multiplicity pp collisions at $\sqrt{s}=13\mathrm{TeV}$

   J.E. Parkkila (for the ALICE Collaboration)🇨🇭

   In these proceedings, the measurements of the long-range near-side yields of charged hadrons in low-multiplicity proton--proton collisions at \thirteen are presented. The investigation studies pairs of charged particles within $1.4<|\Delta \eta |<1.8$ and $1<p_{\mathrm{T}}<2\mathrm{GeV}/c$, exploring the charged-particle multiplicity dependence of these observables at mid-rapidity. The analysis extends the previous studies of two-particle correlations in hadronic collisions by exploring the lowest multiplicity region ever investigated, where the formation of a strongly-interacting medium is less likely. By comparing the results with those obtained in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collisions at $\sqrt{s}=91\mathrm{GeV}$, the role of the ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collision mechanisms in the emergence of collective-like phenomena in small systems can be constrained. The study provides new insights into the origin of long-range correlations in proton-proton collisions.

   nucl-ex0 citations
2. 02*

   Signals of strong parity violation in deep inelastic scattering

   Alessandro Bacchetta🇮🇹 · Matteo Cerutti🇮🇹 · Ludovico Manna🇮🇹 · Marco Radici🇮🇹 · Xiaochao Zheng🇺🇸

   We include strong parity-violating contributions to inclusive deep inelastic scattering (DIS) of longitudinally polarized leptons off an unpolarized target. At variance with standard results, we obtain nonvanishing parity-violating structure functions in the case of pure photon exchange. The addition of these strong parity-violating contributions improves the description of existing experimental data on DIS parity-violating asymmetries. We find the size of these contributions small but exhibiting a deviation from zero of about 1.5 $\sigma$. The associated $p$-value is 0.063, indicating that the probability of making an error by rejecting the hypothesis of no parity-violating contributions is 6.3\%, which is small but not negligible. Further improvement on the limit of the strong parity-violation can be expected from the future SoLID program at Jefferson Lab.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2024)·9 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.