XXVI DAE-BRNS High Energy Physics Symposium 2024

Simulation studies of event-by-event fluctuations of mean transverse momentum (⟨pT⟩) in pp collisions at s= 13 TeV with PYTHIA8 and HERWIG7 models

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Oral Heavy ion and QCD

Speaker

Subhadeep Roy (IIT- Indian Institute of Technology (IN))

Description

Measurements of event-by-event mean transverse momentum ($⟨p_{\mathrm{T}}⟩$) fluctuations are reported in terms of the integral correlator $⟨\mathrm{\Delta }{p}_{\mathrm{T}}\mathrm{\Delta }{p}_{\mathrm{T}}⟩$ and skewness of the event-wise $⟨p_{\mathrm{T}}⟩$ distribution in pp collisions at $\sqrt{s}=13$ TeV with the Monte Carlo event generators PYTHIA8 and HERWIG7. The final-state charged particles with transverse momentum ($p_{\mathrm{T}}$) and pseudo-rapidity ($\eta$) range $0.15\le p_{\mathrm{T}}\le 2.0$ GeV/$c$ and $|\eta |\le 0.8$ were considered for the investigations. The correlator $⟨\mathrm{\Delta }{p}_{\mathrm{T}}\mathrm{\Delta }{p}_{\mathrm{T}}⟩$ is observed to follow distinct declining trends with the average charged particle multiplicity ($⟨N_{\mathrm{c}\mathrm{h}}⟩$) for the PYTHIA8 and HERWIG7 models. Furthermore, both models yield positive finite skewness in low-multiplicity events. The observables are additionally studied using the transverse spherocity estimator ($S_0$) to comprehend the relative contributions of hard scattering (jets) and soft multi-partonic interactions (MPI). The present comparative measurements using these models would provide a better understanding of the fluctuation dynamics and construct a crucial baseline to search for non-trivial fluctuations in heavy-ion collisions.

Presentation materials

Roy_mpT_fluctuation_DAEHEPNov24.pdf