Speaker
Description
This study reports measurements of event-by-event fluctuations in mean transverse momentum ($\langle p_{\rm T} \rangle$) using the integral correlator $\langle \Delta p_{\rm T} \Delta p_{\rm T}\rangle$ and the skewness of the event-wise $\langle p_{\rm T} \rangle$ distribution in pp collisions at $\sqrt{s}=13$ TeV. These measurements are conducted with the Monte Carlo event generators PYTHIA8 and HERWIG7, focusing on final-state charged particles with transverse momentum ($p_{\rm T}$) in the range $0.15 \leq p_{\rm T}\leq 2.0$ GeV/$c$ and pseudo-rapidity $|\eta| \leq 0.8$. Results show that $\langle \Delta p_{\rm T} \Delta p_{\rm T}\rangle$ displays a distinct declining trend with average charged particle multiplicity ($\langle N_{\rm ch} \rangle$) in both models, with PYTHIA8 and HERWIG showing unique patterns. Positive finite skewness is observed in low-multiplicity events across both models, indicating asymmetry in the $\langle p_{\rm T} \rangle$ distributions. Additionally, the transverse spherocity estimator ($S_{\rm 0}$) is used to analyze the influence of hard scattering (jets) versus soft multi-partonic interactions (MPI) on these fluctuations. These comparative measurements provide insights into fluctuation dynamics in pp collisions, establishing an essential baseline for detecting non-trivial fluctuations in heavy-ion collision environments.
| Category | Theory |
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