Simulation studies of $\rm{R_{2}}(Δη, Δφ)$ and $\rm{P_{2}}(Δη, Δφ)$ correlation functions in pp collisions with the PYTHIA and HERWIG models

Baidyanath Sahoo; Basanta Kumar Nandi; Prabhat Pujahari; Sumit Basu; Claude Pruneau

doi:10.1103/PhysRevC.100.024909

paper

Simulation studies of $R_{2} (Δ η, Δ φ)$ and $P_{2} (Δ η, Δ φ)$ correlation functions in pp collisions with the PYTHIA and HERWIG models

arXiv:1810.09747 · doi:10.1103/PhysRevC.100.024909

Abstract

We report studies of charge-independent (CI) and charge-dependent (CD) two-particle differential-number correlation functions, $R_{2} (Δ η, Δ φ)$ , and transverse momentum ( $p_{T}$ ) correlation functions, $P_{2} (Δ η, Δ φ)$ , of charged particles in $s$ = 2.76 TeV pp collisions with the PYTHIA and HERWIG models. Model predictions are presented for inclusive charged hadrons ( $h^{\pm}$ ), as well as pions ( $π^{\pm}$ ), kaons (K $^{\pm}$ ), and (anti-)protons ( $p ˉ$ /p) in the ranges $0.2 < p_{T} \leq 2.0 GeV / c$ , $2.0 < p_{T} \leq 5.0 GeV / c$ , and $5.0 < p_{T} \leq 30.0 GeV / c$ , with full azimuthal coverage in the range $∣ η ∣ < 1.0$ . We compare the model predictions for the strength and shape of the $R_{2}$ and $P_{2}$ correlators as these pertain to recent measurements by the ALICE collaboration. The $R_{2}$ and $P_{2}$ correlation functions estimated with PYTHIA and HERWIG exhibit qualitatively similar near-side and away-side correlation structures but feature important differences. Our analysis indicates that comparative studies of $R_{2}$ and $P_{2}$ correlation functions would provide valuable insight towards the understanding of particle production in pp collisions, and by extension, should also be useful in studies of heavy-ion collisions. Comparison of the $Δ η$ dependence of $R_{2}$ and $P_{2}$ could contribute, in particular, to a better understanding and modeling of the angular ordering of particles produced by hadronization in jets, as well as a better description of jet fragmentation functions of identified species at low momentum fraction $(z)$ .

arXiv comment22 pages, 24 captioned figures

Simulation studies of $R_{2} (Δ η, Δ φ)$ and $P_{2} (Δ η, Δ φ)$ correlation functions in pp collisions with the PYTHIA and HERWIG models

Abstract

References in corpus (42)

Cited by in corpus (3)

Simulation studies of R2​(Δη,Δφ) and P2​(Δη,Δφ) correlation functions in pp collisions with the PYTHIA and HERWIG models

Abstract

References in corpus (42)

Cited by in corpus (3)

Simulation studies of $R_{2} (Δ η, Δ φ)$ and $P_{2} (Δ η, Δ φ)$ correlation functions in pp collisions with the PYTHIA and HERWIG models