Setting the string shoving picture in a new frame

Bierlich, Christian; Chakraborty, Smita; Gustafson, Gösta; Lönnblad, Leif

doi:10.1007/jhep03(2021)270

Cited by 40 publications

(66 citation statements)

References 99 publications

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“…With these results in mind, in particular the observation of collective behaviours that are consistent with data and the shift in the p ⊥ spectrum away from data, an important followup project would combine all the features that have been introduced on top of the basic Pythia/Angantyr model. In addition to the rescattering, two such features are shoving [23], where an improved modelling [25] will soon be part of the standard code, and rope formation. With all these effects in place, it would also be pertinent to attempt an overall tuning.…”

Section: Discussionmentioning

confidence: 99%

“…We want here to emphasize that, while hadronic rescattering can obviously not describe data for elliptic flow completely, the results here suggest that hadronic rescattering with early hadronization has a larger effect than previously thought, for example in comparisons of UrQMD to RHIC data [70], where hadronic rescattering accounts for only about 50% of the elliptic flow. This is particularly interesting seen in the connection with recent results, that interactions between strings before hadronization in the string shoving model [25] will also give a sizeable contribution to flow coefficients in heavy ion collisions, without fully describing data. The combination of the two frameworks, to test whether the combined effect is compatible with data, will be a topic for a future paper.…”

Section: Flow Coefficientsmentioning

confidence: 96%

“…Beyond that, it also offers a platform on top of which various collective non-QGP phenomena can be added. One example is shoving [23][24][25], whereby closely overlapping colour fields repel each other, to give a collective flow. Another is colour rope formation [26], wherein overlapping colour fields can combine to give a higher field strength, thus enhancing strangeness production relative to the no-overlap default.…”

Section: Introductionmentioning

confidence: 99%

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Hadronic rescattering in pA and AA collisions

2021

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In a recent article we presented a model for hadronic rescattering, and some results were shown for $$\mathrm {p}\mathrm {p}$$ p p collisions at LHC energies. In order to extend the studies to $$\mathrm {p}\mathrm {A}$$ p A and $$\mathrm {A}\mathrm {A}$$ A A collisions, the Angantyr model for heavy-ion collisions is taken as the starting point. Both these models are implemented within the general-purpose Monte Carlo event generator Pythia, which makes the matching reasonably straightforward, and allows for detailed studies of the full space–time evolution. The rescattering rate is significantly higher than in $$\mathrm {p}\mathrm {p}$$ p p , especially for central $$\mathrm {A}\mathrm {A}$$ A A collisions, where the typical primary hadron rescatters several times. We study the impact of rescattering on a number of distributions, such as $$p_{\perp }$$ p ⊥ and $$\eta $$ η spectra, and the space–time evolution of the whole collision process. Notably rescattering is shown to give a significant contribution to elliptic flow in $$\mathrm {XeXe}$$ XeXe and $$\mathrm {PbPb}$$ PbPb , and to give a nontrivial impact on charm production.

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Section: Discussionmentioning

confidence: 99%

Section: Flow Coefficientsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Hadronic rescattering in pA and AA collisions

2021

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“…Yang-Ting Chien model with string shoving effects [1,2]. Such a string based model gives an alternative and qualitatively different picture of the medium.…”

Section: Pos(hardprobes2020)013mentioning

confidence: 99%

Jet Substructure

Chien¹

2021

Proceedings of 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPro

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In this proceeding we emphasize the importance of jet substructure studies for testing theoretical approaches of understanding jet-medium interactions. We will review some established experimental measurements of infrared and collinear safe jet observables and the comparisons with theory calculations. The observables discussed here are the radial and longitudinal jet energy profiles, as well as the jet radius dependence of the jet suppression factor R AA which is sensitive to the jet internal structure. We also highlight new and future directions in jet substructure studies, including hard probes using hadronic decaying electroweak bosons and top quarks, as well as tools for identifying relevant jet evolution phase space which may showcase signatures of jet-medium interactions. In the end we stress that in an era of precision jet substructure studies, significant improvement in controlling both theory and experiment uncertainties is required.

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“…However, dynamical correlations, like the near side ridge and elliptic flow observables, are generally difficult to reproduce within the traditional string fragmentation framework. The recent development of the string shoving mechanism [43][44][45] is expected to improve the description of these measurements by considering the repelling of string pieces overlapped in space-time.…”

Section: Introductionmentioning

confidence: 99%

Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions

et al. 2021

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The striking resemblance of high multiplicity proton-proton (pp) collisions at the LHC to heavy ion collisions challenges our conventional wisdom on the formation of the quark-gluon plasma (QGP). A consistent explanation of the collectivity phenomena in pp will help us to understand the mechanism that leads to the QGP-like signals in small systems. In this study, we introduce a transport model approach connecting the initial conditions provided by PYTHIA8 with subsequent AMPT rescatterings to study the collective behavior in high energy pp collisions. The multiplicity dependence of light hadron productions from this model is in reasonable agreement with the pp $$\sqrt{s}=13$$ s = 13 TeV experimental data. It is found in the comparisons that both the partonic and hadronic final state interactions are important for the generation of the radial flow feature of the pp transverse momentum spectra. The study also shows that the long range two particle azimuthal correlation in high multiplicity pp events is sensitive to the proton sub-nucleon spatial fluctuations.

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Setting the string shoving picture in a new frame

Cited by 40 publications

References 99 publications

Hadronic rescattering in pA and AA collisions

Hadronic rescattering in pA and AA collisions

Jet Substructure

Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions

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