A remark on the sign change of the four-particle azimuthal cumulant in small systems

Bzdak, Adam; Ma, Guo-Liang

doi:10.1016/j.physletb.2018.03.068

Cited by 6 publications

(2 citation statements)

References 86 publications

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“…At the initial stage, the conservation [57]. After parton cascade, c 2 {2} is enhanced and c 2 {4} changes sign from positive to negative at a certain value of N ch , which maybe due to the interplay between transverse momentum conservation and an anisotropic flow generated by parton cascade [58].…”

Section: Resultsmentioning

confidence: 99%

Multiparticle azimuthal cumulants in p+Pb collisions from a multiphase transport model

et al. 2018

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A new subevent cumulant method was recently developed, which can significantly reduce the nonflow contributions in long-range correlations for small systems compared to the standard cumulant method. In this work, we study multi-particle cumulants in p+Pb collisions at √ s NN = 5.02 TeV with a multiphase transport model (AMPT), including two-and four-particle cumulants (c 2 {2}and c 2 {4}) and symmetric cumulants [SC(2, 3) and SC(2, 4)]. Our numerical results show that v 2 {2} is consistent with the experimental data, while the magnitude of c 2 {4} is smaller than the experimental data, which may indicate either the collectivity is underestimated or some dynamical fluctuations are absent in the AMPT model. For the symmetric cumulants, we find that the results from the standard cumulant method are consistent with the experimental data, but those from the subevent cumulant method show different behaviors. The results indicate that the measurements from the standard cumulant method are contaminated by non-flow effects, especially when the number of produced particles is small. The subevent cumulant method is a better tool to explore the real collectivity in small systems.

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Section: Resultsmentioning

confidence: 99%

Multiparticle azimuthal cumulants in p+Pb collisions from a multiphase transport model

et al. 2018

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“…Besides hydrodynamic models, a multiphase transport model (AMPT) is also employed in studies of anisotropic flow in high energy collisions. Including both partonic and hadronic interactions, a multiphase transport model can reasonably reproduce experimental flow measurements in both large and small collision systems [30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions

Ma,

2021

Preprint

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We explore parton collisional effects on the conversion of geometry eccentricities into azimuthal anisotropies in Pb+Pb collisions at √ sNN = 5.02 TeV using a multi-phase transport model. The initial eccentricity εn (n = 2,3) and flow harmonics vn (n = 2,3) are investigated as a function of the number of parton collisions (N coll ) during the source evolution of partonic phase. It is found that partonic collisions leads to generate elliptic flow v2 and triangular flow v3 in Pb+Pb collisions. On the other hand, partonic collisions also result in an evolution of the eccentricity of geometry. The collisional effect on the flow conversion efficiency is therefore studied. We find that the partons with larger N coll show a lower flow conversion efficiency, which reflect differential behaviors with respect to N coll . It provides an additional insight into the dynamics of the space-momentum transformation during the QGP evolution from a transport model point of view.

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Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions

2021

Phys. Rev. C

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A remark on the sign change of the four-particle azimuthal cumulant in small systems

Cited by 6 publications

References 86 publications

Multiparticle azimuthal cumulants in p+Pb collisions from a multiphase transport model

Multiparticle azimuthal cumulants in p+Pb collisions from a multiphase transport model

Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions

Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions

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