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Equiprobability Anomaly Detector Using Angular Distributions
Abstract
We use the angular distribution of top quark pairs (tt̅) in the semileptonic final state bb̅ ℓνqq̅' to construct an anomaly detector for non-tt̅ events. Wigner D functions expand the distribution with coefficients determined by orthogonal series density estimation. Its equiprobable surfaces bin the events, the non-tt̅ concentrate at low tt̅ density. The separation is quantified by the Kullback-Leibler divergence, which makes connection to variational autoencoders. The performance is comparable to normalizing flows at parton level, but is limited by jet assignments at reconstruction level.
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BibTeX
@misc{whitten2026equiprobability,
title = {{Equiprobability Anomaly Detector Using Angular Distributions}},
author = {Alex Whitten and John Cicero and Tae Min Hong},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.23667},
eprint = {2610.23667},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.23667},
}
RIS
TY - UNPB
TI - Equiprobability Anomaly Detector Using Angular Distributions
AU - Alex Whitten
AU - John Cicero
AU - Tae Min Hong
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2610.23667
UR - https://arxiv.org/abs/2610.23667
AB - We use the angular distribution of top quark pairs (tt̅) in the semileptonic final state bb̅ ℓνqq̅' to construct an anomaly detector for non-tt̅ events. Wigner D functions expand the distribution with coefficients determined by orthogonal series density estimation. Its equiprobable surfaces bin the events, the non-tt̅ concentrate at low tt̅ density. The separation is quantified by the Kullback-Leibler divergence, which makes connection to variational autoencoders. The performance is comparable to normalizing flows at parton level, but is limited by jet assignments at reconstruction level.
ER -