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

Multi-dimensional measurements of parton shower in pp collisions at RHIC

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Strong interactions and Hadron Physics Poster Session


Monika Robotková (Nuclear Physics Institute, Czech Academy of Sciences)


Jets are collimated sprays of hadrons and serve as an experimental tool for studying the dynamics of quarks and gluons. In particular, differential measurements of jet substructure enable a systematic exploration of the parton shower evolution. The SoftDrop grooming technique utilizes the angular ordered Cambridge/Aachen reclustering tree and provides a correspondence between the experimental observables, such as the shared momentum fraction $(z_{\rm{g}})$, groomed jet radius or split opening angle $(R_{\rm{g}})$, and the QCD splitting functions in vacuum. We present fully corrected correlations between $z_{\rm{g}}$ and $R_{\rm{g}}$ at the first split for jets of varying momenta and radii in $pp$ collisions at $\sqrt{s} = 200$ GeV. To study the evolution along the jet shower, we also present the splitting observables at the first, second and third splits along the jet shower for various jet and initiator prong momenta. As these novel measurements are presented in three dimensions, we outline the correction procedure so that it can be used as a template for future multi-differential measurements across all experiments.

In-person participation Yes

Primary author

Monika Robotková (Nuclear Physics Institute, Czech Academy of Sciences)

Presentation materials