Simulation Studies of $$\textrm{R}_2(\Delta \eta ,\Delta \phi )$$ and $$\textrm{P}_2(\Delta \eta ,\Delta \phi )$$ Correlation Functions in pp Collisions with the PYTHIA and HERWIG Models
Proceedings of the XXIV DAE-BRNS High Energy Physics Symposium, Jatni, India(2022)
摘要
We presented a study of charge-independent (CI) and charge-dependent (CD) two-particle differential number correlation functions
$$\textrm{R}_2$$
and transverse momentum correlation functions
$$\textrm{P}_2$$
in pp collisions at
$$\sqrt{s} = 2.76$$
TeV with the PYTHIA and HERWIG models. Calculations were presented for unidentified hadrons in three
$$p_\textrm{T}$$
ranges
$$0.2 < p_\textrm{T} \le 2.0$$
GeV/c,
$$2.0 < p_\textrm{T} \le 5.0$$
GeV/c, and
$$5.0 < p_\textrm{T} \le 30.0$$
GeV/c. PYTHIA and HERWIG both qualitatively reproduce the near-side peak and away-side ridge correlation features reported by experiments. At low
$$p_\textrm{T}$$
, both models produce narrower near-side peaks in
$$\textrm{P}_2$$
correlations than in
$$\textrm{R}_2$$
as reported by the ALICE collaboration in p–Pb and Pb–Pb collisions. This suggests that the narrower shape of the
$$\textrm{P}_2$$
near-side peak is largely determined by the
$$p_\textrm{T}$$
dependent angular ordering of hadrons produced in jets. Both PYTHIA and HERWIG predict widths that decrease with increasing
$$p_\textrm{T}$$
. Widths extracted for
$$\textrm{P}_2$$
correlators are typically significantly narrower than those of the
$$\textrm{R}_2$$
counterparts [1].
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