Speaker
Tae Min Hong
(University of Pittsburgh (US))
Description
We use the angular distribution of top quark pairs (tt¯) in the semileptonic final state bb¯ℓνqq¯′ to construct an anomaly detector for non-tt¯ events. Wigner D functions expand the distribution with coefficients determined by orthogonal series density estimation. Its equiprobable surfaces bin the events, the non-tt¯ concentrate at low tt¯ 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.
https://arxiv.org/abs/2610.23667v1
Author
Tae Min Hong
(University of Pittsburgh (US))