Effects of Near-side Two-jet Recombination on Away-side Correlation at LHC

TL;DR

This paper investigates how near-side two-jet recombination affects away-side particle correlations in Pb-Pb collisions at LHC, proposing a method to identify this phenomenon through azimuthal correlation analysis.

Contribution

It introduces a simulation-based approach to distinguish away-side correlations caused by two-jet recombination from single-jet recoil effects.

Findings

Two-jet recombination alters away-side correlation patterns.

Moments of correlation distributions can differentiate trigger types.

A measurable signature of two-jet recombination is proposed.

Abstract

The creation of partons with transverse momenta around 10 GeV/c in Pb-Pb collisions at LHC is expected to be so copious that the parton density may be high enough for neighboring jet cones to overlap. If the shower partons in adjacent jets can recombine to form trigger particles, the distribution of hadrons on the away side should be distinguishable from that due to the recoil of a single harder parton that can produce a similar trigger particle by fragmentation. The two-particle azimuthal correlation on the away side is generated by simulation of the two trigger types. Moments of the correlation distributions are calculated to exhibit their differences. A measure that can be determined by suitable analysis of the LHC data is suggested. It may reveal the footprint of two-jet recombination.