XXVI DAE-BRNS High Energy Physics Symposium 2024

Study of Event Shape Observables in $Z \rightarrow \ell^+ \ell^-$ Events in pp Collisions Using Pythia 8

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Postar Top Quark and EW physics

Speaker

Mr Avijeet . (Amity University Uttar Pradesh, Noida)

Description

Event shape observables are essential tools for probing Quantum Chromodynamics (QCD) and deepening our understanding of its dynamics. In this contribution, we present a study of charged-particle event-shape observables, specifically transverse thrust and transverse sphericity, measured in inclusive Z boson events where the Z decays into electrons or muons. Given that the Z boson is an object without colour charge, it does not affect with hadronic activity in the collision, making it an ideal benchmark. Event-shape observables are calculated using charged particles, excluding the decay products of the Z boson, to isolate the underlying event (UE) contributions. In proton-proton collisions, UE activity particularly multi-parton interactions (MPI) significantly influences the structure and topology of the events. We simulate events using the Pythia 8 Monte Carlo event generator, with MPI effects toggled on and off, to provide a direct comparison of MPI’s impact on event-shape distributions. This study offers valuable insights for refining event modelling, improving the accuracy of QCD simulations, and enhancing theoretical precision in particle measurements at the LHC.