Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Spectral clustering for jet physics

Jul 8, 2022, 2:30 PM
Room 1 (Europa Auditorium)

Room 1 (Europa Auditorium)

Parallel Talk Strong interactions and Hadron Physics Strong interactions and Hadron Physics


Giorgio Cerro (University of Southampton)


We present a new approach to jet definition alternative to clustering methods, such as the anti-kT scheme, that exploit kinematic data directly. Instead the new method uses kinematic information to represent the particles in a multidimensional space, as in spectral clustering. After confirming its Infra-Red (IR) safety, we compare its performance in analysing $gg \rightarrow H_{125GeV} \rightarrow H_{40GeV} H_{40GeV} \rightarrow \bar{b}b\bar{b}b $, $gg \rightarrow H_{500GeV} \rightarrow H_{125GeV}H_{125GeV} \rightarrow \bar{b}b\bar{b}b$ and $gg, q\bar{q} \rightarrow t\bar{t} → \bar{b}b W^+ W^− \rightarrow \bar{b}bjjlν_l$ events from Monte Carlo (MC) samples, specifically, in reconstructing the relevant final states, to that of the anti-kT algorithm. Finally, we show that the results for spectral clustering are obtained without any change in the parameter settings of the algorithm, unlike the anti-kT case, which requires the cone size to be adjusted to the physics process under study.

In-person participation Yes

Primary authors

Claire H. Shepherd-Themistocleous (Rutherford Appleton Laboratory) Giorgio Cerro (University of Southampton) Dr Henry Day-Hall (Czech Technical University, Prague) Prof. Srinandan Dasmahapatra (University of Southampton) Prof. Stefano Moretti (University of Southampton)

Presentation materials