Shedding Light on Hadronization by Quarkonium Energy Correlator

TL;DR

This paper introduces a new energy correlator observable in quarkonium production that enables direct probing of hadronization effects without relying on jet reconstruction, especially effective in certain angular regions.

Contribution

The paper proposes a novel energy correlator measurement method in quarkonium production that enhances the study of hadronization processes with perturbative predictions.

Findings

The energy correlator eliminates the need for jet reconstruction.

It provides a unique probe of hadronization effects.

The observable is especially sensitive when oshi in the quarkonium rest frame.

Abstract

We propose to measure the energy correlator in quarkonium production, which tracks the energy deposited in the calorimeter $\chi$-angular distance away from the identified quarkonium. The observable eliminates the need for jets while sustaining the perturbative predictive power. Analyzing the power correction to the energy correlator, we demonstrate the novel observable supplies a unique gateway to probing the hadronization, especially when $\cos\chi\gtrsim 0$ in the quarkonium rest frame where the perturbative emissions are depleted due to the dead-cone effects. We expect the quarkonium energy correlator to add a new dimension to quarkonium studies.