Speaker
Description
We investigate the Charge-Charge Correlation (QQC) as a probe of charge dynamics in Quantum Chromodynamics. While generally divergent beyond leading order, we show that the QQC is infrared and collinear safe in the back-to-back limit, a property that we dub leading-power safety. This enables an analytic perturbative treatment that bypasses the reliance on non-perturbative track or fragmentation functions. Using Soft-Collinear Effective Theory, we derive a factorization theorem and determine its logarithmic behavior analytically up to four loops in QCD, uncovering remarkable connections with the Energy-Energy Correlation (EEC), and establish its resummation to N4LL accuracy.
In this talk, I will also discuss recent and ongoing developments on the application of charge correlators in spin physics and hadronization.