This paper is a conference proceeding that reviews recent hard-jet correlation measurements in large and small collision systems; it contains no new experimental data, analysis, or derivation.
Probing fluctuating protons using forward neutrons in soft and hard inelastic proton-nucleus scattering
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abstract
We present a model for the distribution of the number of forward neutrons emitted in soft (minimum bias) and hard inelastic proton-nucleus ($pA$) scattering at the LHC. It is based on the Gribov-Glauber model for the distribution over the number of inelastic collisions (wounded nucleons) combined with a parametrization of cross section (color) fluctuations in the projectile proton, which depend on the parton momentum fraction $x_p$, and the assumption of independent neutron emissions. We observe that while the effect of soft color fluctuations is modest, a reduction of the interaction strength with increasing $x_p$ provides the dominant effect. It allows us to qualitatively describe the trend of the ATLAS data on the ZDC energy spectra of forward neutrons emitted in dijet production in inelastic $pA$ scattering at $\sqrt{s_{NN}}=8.16$ TeV.
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Hard-jet correlations in large and small systems
This paper is a conference proceeding that reviews recent hard-jet correlation measurements in large and small collision systems; it contains no new experimental data, analysis, or derivation.