New articles on Nuclear Experiment

[1] 2306.04808

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

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.

[2] 2306.04704

Signals of strong parity violation in deep inelastic scattering

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. Their size is small but incompatible with zero at about 1.5-$\sigma$ level.