Exploring new small system geometries in heavy ion collisions

Lim, Sanghoon; Carlson, J.; Loizides, C.; Lonardoni, Diego; Lynn, J. E.; Nagle, J. L.; Koop, J. D. Orjuela; Ouellette, J.

doi:10.1103/physrevc.99.044904

Cited by 44 publications

(33 citation statements)

References 57 publications

(89 reference statements)

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“…It was argued that the imprints of this initial geometry will be reflected at the final stage provided the hydrodynamic collectivity prevails. For example, if the system has an intrinsic elliptic or triangular shape, hydrodynamic collectivity would favor an ordering between the final state elliptic (v 2 ) and triangular (v 3 ) flow coefficients [11,21]. The measurements of v 2,3 by the PHENIX collaboration indeed presented some evidence in favor of this conjectured correlations between the initial geometry and hydroexpected ordering in the flow patterns [20].…”

Section: Introductionmentioning

confidence: 95%

Examining the event-shape-dependent modifications to charged-particle transverse momentum spectra and elliptic flow in p -Pb collisions at energies available at the CERN Large Hadron Collider

et al. 2020

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Purported signatures of collective dynamics in small systems like proton-proton (pp) or proton-nucleus (p-A) collisions still lack unambiguous understanding. Despite the qualitative and/or quantitative agreement of the data to hydrodynamic models, it has remained unclear whether the harmonic flows in small systems relate to the common physical picture of hydrodynamic collectivity driven by the initial geometry. In the present work, we aim to address this issue by invoking a novel concept of event shape engineering (ESE), which has been leveraged to get some control of the initial geometry in high-energy heavy-ion collisions. We utilize ESE by constructing a reference flow vector, q 2 that allows to characterize an event based on its ellipticity. Applying this technique on a data set, simulated from a 3 + 1 dimensional viscous hydrodynamic model EPOS3, we study the event-shape dependent modifications to some of the bulk properties, such as inclusive transverse momentum (p T) spectra and p T-differential v 2 for p-Pb collisions at 5.02 TeV. Selecting events on the basis of different magnitudes of reference flow vector q 2 , we observe a hint of event-shape induced modifications of v 2 as a function of p T , but the inclusive p T spectra of charged particles seem to be insensitive to this event-shape selection.

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Section: Introductionmentioning

confidence: 95%

Examining the event-shape-dependent modifications to charged-particle transverse momentum spectra and elliptic flow in p -Pb collisions at energies available at the CERN Large Hadron Collider

et al. 2020

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“…We verified with Phobos Glauber model that varying parameters such as nucleon cross-section, diffuseness parameter only has small influence on εn. The influence of alpha-clustering in O was also found to be small[16] …”

mentioning

confidence: 91%

“…Several studies of elliptic flow (v 2 ) and triangular flow (v 3 ) based on such geometry scan have been performed at RHIC with p+Au, d+Au and 3 He+Au [13][14][15][16][17]. In high-multiplicity events, the ε 2 was predicted to be larger than in p+Au while the ε 3 is comparable [12].…”

mentioning

confidence: 99%

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Huang¹,

Chen²,

Li³

et al. 2020

Phys. Rev. C

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The observation of multi-particle azimuthal correlations in high-energy small-system collisions has led to intense debate on its origin and the possible coexistence from two competing theoretical scenarios: one based on initial-state intrinsic momentum anisotropy (ISM), and the other based on final-state collective response to the collision geometry (FSM). To complement the previous scan of asymmetric collision systems (p+Au, d+Au and He+Au), we propose a scan of small symmetric collision systems at RHIC, such as C+C, O+O, Al+Al and Ar+Ar √ s NN = 0.2 TeV, to provide further insights in disentangling contributions from these two scenarios. These symmetric small systems have the advantage of providing a better controlled initial geometry dominated by the average shape of the overlap region, as opposed to fluctuation-driven geometries in asymmetric systems. A transport model is employed to investigate the expected geometry response in the FSM scenario. Different trends of elliptic flow with increasing charge particle multiplicity are observed between symmetric and asymmetric systems, while triangular flow appears to show a similar behavior. Furthermore, a comparison of O+O collisions at √ s NN = 0.2 TeV and at √ s NN = 2.76 − 7 TeV, as proposed at the LHC, provides a unique opportunity to disentangle the collision geometry effects at nucleon level from those arising from subnucleon fluctuations.

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“…It was found much earlier [3] that -core bound state in 16 O impacts -transfer and knock-out nuclear reactions involving 16 O. However, it was shown only recently that the initial collision eccentricity [4], collective flow [5,6] and the production of D-mesons [7] in relativistic 16 O- 16 O collisions are partially affected by clustering. At the same time, the influence of the clusterisation in 16 O on the spectator matter produced in 16 O- 16 O at the LHC energies was not considered so far and has to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Secondary nuclei from $^{16}$O fragmentation at the LHC

Svetlichnyi¹,

Nepeivoda²,

Kozyrev³

et al. 2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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Fragmentation of relativistic 16 O in nuclear emulsions and in future runs at the LHC was simulated with the Abrasion-Ablation Monte Carlo for Colliders (AAMCC) model. The calculated probabilities of production of specific elements as spectators in 16 O-Em collisions were found in general agreement with measurements. However, the calculated multiplicity distributions of 4 He fragments have demonstrated the underestimation of channels with single 4 He and, especially with two and three 4 He. Such a deficiency of multiple production of 4 He can be attributed to -clustering in initial 16 O. The cross sections of production of given numbers of spectator neutrons and nucleons as well as certain spectator nuclei were also calculated with AAMCC for 16 O-16 O collisions at the LHC.

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Exploring new small system geometries in heavy ion collisions

Cited by 44 publications

References 57 publications

Examining the event-shape-dependent modifications to charged-particle transverse momentum spectra and elliptic flow in p -Pb collisions at energies available at the CERN Large Hadron Collider

Examining the event-shape-dependent modifications to charged-particle transverse momentum spectra and elliptic flow in p -Pb collisions at energies available at the CERN Large Hadron Collider

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Secondary nuclei from $^{16}$O fragmentation at the LHC

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