Investigating the transverse-momentum- and pseudorapidity-dependent flow vector decorrelation in p–Pb collisions with a multi-phase transport model

Event-by-event fluctuations in the initial energy density of nuclear collisions lead to the decorrelation of second order flow vector, which is known as its transverse-momentum ( ) and pseudorapidity (η) dependence as observed in high-energy heavy-ion collisions. Existing measurements at the CERN Large Hadron Collider showed that these decorrelations are also observed in small collision systems. In this work, a systematic study of the transverse-momentum- and pseudorapidity-dependent flow vector decorrelation is performed in p–Pb collisions at the 5.02 TeV with A Multi-Phase Transport (AMPT) model using different tunings of initial conditions and partonic and hadronic interactions. The string-melting version of the AMPT model provides a reasonable description of the measured flow vector decorrelation as a function of and η. We demonstrate that hadronic scatterings do not have a significant effect on decorrelation in p–Pb collisions for different centrality selections, while both initial conditions and partonic interactions affect the magnitude of the decorrelations. In addition, we found that the subtraction of the nonflow, especially the long-range jet correlation, is crucial for the accurate extraction of flow vector decorrelation in small collision systems. The comparison of data and model presented in this paper provide further insights in understanding the fluctuations of the flow vector with and η in small collision systems and has referential value for future measurements.