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Quantum Interference in Jets at Subleading Color

by Andrew J. Larkoski

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Submission summary

Authors (as registered SciPost users): Andrew Larkoski
Submission information
Preprint Link: scipost_202210_00058v1  (pdf)
Date submitted: 2022-10-10 19:33
Submitted by: Larkoski, Andrew
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
Specialties:
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Phenomenological

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.

Current status:
Has been resubmitted

Reports on this Submission

Anonymous Report 1 on 2022-11-8 (Invited Report)

Report

While strictly angular ordered parton showers implement the proper colour factors dictated by coherence, dipole showers in general do not. The comment added in the new revision should reference recent work on this issue (Hamilton et al. 2011.10054 and Holguin et al. 2011.15087). Otherwise I am happy with the manuscript to go ahead. No further review is needed if the citation request above has been implemented.

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Author:  Andrew Larkoski  on 2022-11-08  [id 2996]

(in reply to Report 1 on 2022-11-08)

I thank the referee for this suggestion and earlier comments on improvement of the draft. I have included these references and a sentence in that paragraph in section 4.

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