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arXiv · 2205.12375

Designing Observables for Quantum Interference in Jets at Subleading Color

Andrew J. Larkoski
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Abstract

The large-$N_c$ or topologically planar limit of gauge theories can be considered as a classical limit because all gauge bosons are distinguishable particles and therefore cannot exhibit interference. Quantum effects due to the flow of color therefore arise starting at subleading in $1/N_c$. We introduce kinematic observables explicitly sensitive to effects at subleading color formed from the ratio of interfering to squared color-ordered amplitudes. Such observables are in general not infrared and collinear safe, so we introduce angular observables defined from appropriate multi-point energy correlators motivated by the form of color-ordered amplitudes. We demonstrate that color interference effects are manifest as sinusoidal oscillation in the simplest system, a collinear jet with three particles, and show the limitations of predicting this observable in all-purpose, leading-color parton shower Monte Carlos.

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Andrew J. Larkoski. 2022-05-24. Designing Observables for Quantum Interference in Jets at Subleading Color. https://doi.org/10.21468/scipostphys.14.3.041

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