Studies of heavy-ion collisions using PYTHIA Angantyr and UrQMD

Silva, André Vieira da; Serenone, Willian Matioli; Chinellato, D. D.; Takahashi, J.; Bierlich, Christian

doi:10.48550/arxiv.2002.10236

Cited by 7 publications

(8 citation statements)

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“…With the lack of experimental observations of jet quenching effect with present accuracy in small collision systems [29,30], the measurements aforementioned raise the difficult but intriguing question of whether these observations arise similarly to heavy-ion collisions, namely from the formation of a hot and dense fluid-like medium, or rather involve other physical mechanisms [31,32]. Several theoretical approaches and models have been put forward to explain these QGP-like effects in small systems while accounting for the absence of jet quenching [33][34][35][36][37], such as multiple parton interactions (MPI) [38], string shoving [39], or rope hadronisation [40]. However, these models cannot explain the measured non-zero elliptic flow at high p T from two-particle correlations [19], which is usually attributed to in-medium path-length dependent energy loss [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Multiplicity dependence of charged-particle jet production in pp collisions at $$\mathbf {\sqrt{s}}=\mathbf {13~TeV}$$

Acharya

Adamová²,

Adler³

et al. 2022

Eur. Phys. J. C

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The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of $$\sqrt{s} = 13\ {\mathrm {TeV}}$$ s = 13 TeV is studied for the first time. Jets are reconstructed from charged particles using the anti-$$k_\mathrm {T}$$ k T algorithm with resolution parameters R varying from 0.2 to 0.7. The jets are measured in the pseudorapidity range $$|\eta _{\mathrm{jet}}|< 0.9-R$$ | η jet | < 0.9 - R and in the transverse momentum range $$5<p_\mathrm {T,jet}^{\mathrm{ch}}<140\ {\mathrm {GeV}}/c$$ 5 < p T , jet ch < 140 GeV / c . The multiplicity intervals are categorised by the ALICE forward detector V0. The $$p_{\mathrm T}$$ p T differential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below $$20\ {\mathrm {GeV}}/c$$ 20 GeV / c . The cross section ratios for different R are also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.

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Section: Introductionmentioning

confidence: 99%

Multiplicity dependence of charged-particle jet production in pp collisions at $$\mathbf {\sqrt{s}}=\mathbf {13~TeV}$$

Acharya

Adamová²,

Adler³

et al. 2022

Eur. Phys. J. C

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“…Although we have shown features resembling radial flow, one can also observe higher-order flow harmonics (v 2 ,v 3 ) in models that pertain to QGP free collision systems. [43].…”

Section: Discussionmentioning

confidence: 99%

Dynamics of particle production in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using PYTHIA8 Angantyr model

Singh,

Bailung,

Roy

2021

Preprint

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We study the dynamics of identified, strange, and multi-strange particle production in Pb-Pb collisions at √ s N N = 2.76 TeV using the recently developed Angantyr model, incorporated within PYTHIA8. We show the interplay between multi-parton interactions (MPI) and color reconnection (CR) on the experimentally measured quantities. The charged-particle multiplicity (N ch ) and mean transverse momentum ( pT ) distributions are well explained by PYTHIA8 Angantyr with proper tuning, as presented in this paper. Predictions of pT spectra, pT , pT integrated yields of the identified, strange and multi-strange particles are studied. To provide insight into the collective nature of the produced particles, we look into the ratio of particle yields to pions and kaons. PYTHIA8 Angantyr with CR and MPI mimic signs of collectivity and is possibly one of the suitable candidates to study ultra-relativistic heavy-ion collisions.

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“…We note that the original AMPT-SM model also shows the long-range near-side correlations, although it does not include the sub-nucleon structure [233]. In addition, the PYTHIA event generator itself has considered final state hadronic rescatterings [206,[248][249][250]. Using the AMPT-SM model with PYTHIA8 initial conditions, we can extend the study of pp collisions [233] to pA and AA collisions with the Angantyr model within the PYTHIA8 framework.…”

Section: H Pythia8 Initial Condition With Sub-nucleon Structurementioning

confidence: 99%

Further developments of a multi-phase transport model for relativistic nuclear collisions

Lin,

Zheng

2021

Preprint

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A multi-phase transport (AMPT) model was constructed as a self-contained kinetic theory-based description of relativistic nuclear collisions as it contains four main components: the fluctuating initial condition, a parton cascade, hadronization, and a hadron cascade. Here, we review the main developments after the first public release of the AMPT source code in 2004 and the corresponding publication that described the physics details of the model at that time. We also discuss possible directions for future developments of the AMPT model to better study the properties of the dense matter created in relativistic collisions of small or large systems.

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Studies of heavy-ion collisions using PYTHIA Angantyr and UrQMD

Cited by 7 publications

References 0 publications

Multiplicity dependence of charged-particle jet production in pp collisions at $$\mathbf {\sqrt{s}}=\mathbf {13~TeV}$$

Multiplicity dependence of charged-particle jet production in pp collisions at $$\mathbf {\sqrt{s}}=\mathbf {13~TeV}$$

Dynamics of particle production in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using PYTHIA8 Angantyr model

Further developments of a multi-phase transport model for relativistic nuclear collisions

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