Wed·Aug 23, 2023Wednesday·August 23, 2023

1. 01*

   Charged-particle jet spectra in event-shape engineered Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with ALICE

   Caitlin Beattie (for the ALICE Collaboration)🇺🇸

   The path-length dependence of jet quenching can help to constrain different jet quenching mechanisms in heavy-ion collisions. However, measuring an explicit value for this dependence has proven challenging. Traditional approaches, which consider anisotropic jet suppression arising from geometric asymmetries, have successfully measured a non-zero azimuthal dependence of jet modification with respect to the event-plane angle of the collision. While such signals improve our qualitative understanding of this topic, extraction of an explicit dependence from these results is limited by fluctuations in the initial state and jet--medium interactions. A new approach to characterize the geometry of the collision is to use event-shape engineering, a technique that classifies events within a centrality class according to their elliptical anisotropies. By doing so, we gain an improved knowledge of the initial-state medium, consequently enabling better constraints on the average path length traversed by the jet. In these proceedings, new results of jet spectra from event-shape-engineered collisions at ALICE will be presented.

   nucl-exPoS(2024)·0 citations
2. 02*

   Measures of azimuthal anisotropy in high-energy collisions

   Jean-Yves Ollitrault🇫🇷

   Azimuthal anisotropy is a key observation made in ultrarelativistic heavy-ion collisions. This phenomenon has played a crucial role in the development of the field over the last two decades. In addition to its interest for studying the quark-gluon plasma, which was the original motivation, it is sensitive to the properties of incoming nuclei, in particular to the nuclear deformation and to the nuclear skin. The azimuthal anisotropy is therefore of crucial importance when relating low-energy nuclear structure to high-energy nuclear collisions. This article is an elementary introduction to the various observables used in order to characterize azimuthal anisotropy, which go under the names of $v_2\{2\}$, $v_3\{2\}$, $v_2\{4\}$, etc. The intended audience is primarily physicists working in the field of nuclear structure.

   nucl-exhep-exhep-phnucl-thEPJA(2023)·34 citations
3. 03*

   Exploring Rapidity-Even Dipolar Flow in Isobaric Collisions at RHIC

   Niseem Magdy🇺🇸 · Roy Lacey🇺🇸

   Employing the AMPT transport model, we investigate the response of the rapidity-even dipolar flow (${\mathrm{v}}_1^{\mathrm{even}}$) and its associated Global Momentum Conservation (GMC) parameter $\mathrm{K}$ to structural disparities within ${}^{96}$Ru and ${}^{96}$Zr nuclei. We analyze $\mathrm{Ru}+\mathrm{Ru}$ and $\mathrm{Zr}+\mathrm{Zr}$ collisions at a center-of-mass energy of $\sqrt{{\text{s}}_{NN}}$ = 200 GeV. Our analysis demonstrates that the eccentricity ${\epsilon }_1$, ${\mathrm{v}}_1^{\mathrm{even}}$ and $\mathrm{K}$ exhibit subtle yet discernible sensitivity to the input nuclear structure distinctions between ${}^{96}$Ru and ${}^{96}$Zr isobars. This observation suggests that measuring $v_1^{\mathrm{even}}$ and the GMC parameter in these isobaric collisions could serve as a means to fine-tune the comprehension of their nuclear structure disparities and offer insights to enhance the initial condition assumptions of theoretical models.

   ↳ nucl-thnucl-exJ.Phys.G(2024)·3 citations
4. 04*

   Momentum dependent measures of correlations between mean transverse momentum and harmonic flow in heavy ion collisions

   Rupam Samanta🇵🇱 · Piotr Bozek🇵🇱

   The correlation between the mean transverse momentum and the harmonic flow coefficients is an observable which is of great interest; it is sensitive to shape fluctuations in the initial state of a relativistic nuclear collision. The measurement of that correlation coefficient in central collisions allows one to infer about the intrinsic deformation of the colliding nuclei. We propose to study the momentum dependent covariance and correlation coefficient between the mean transverse momentum and the harmonic flow in a given transverse momentum bin. Two possible constructions of such observables are provided and predictions are obtained from a viscous hydrodynamic model. We find that such momentum dependent correlation coefficients between the mean transverse momentum and the harmonic flow show a strong and nontrivial momentum dependence. We also explore the effects of granularity (nucleon width) in the initial state, the nuclear deformation, and the shear viscosity on this momentum dependent correlation coefficient. The shape of the momentum dependence of the correlation coefficient for the triangular flow is found to be sensitive to the size of small scale fluctuations in the initial state. On the other hand, the shape of the momentum dependence of the covariance between the mean transverse momentum and the harmonic flow coefficients is found to be sensitive to the value of the shear viscosity and to the granularity of the initial state.

   ↳ nucl-thhep-phnucl-exPRC(2024)·5 citations
5. 05*

   Relativistic Hydrodynamics under Rotation: Prospects & Limitations from a Holographic Perspective

   Markus A. G. Amano🇨🇳 · Casey Cartwright🇳🇱 · Matthias Kaminski🇺🇸 · Jackson Wu🇺🇸

   The AdS/CFT correspondence, or holography, has provided numerous important insights into the behavior of strongly-coupled many-body systems. Crucially, it has provided a testing ground for the construction of new effective field theories, especially those in the low frequency, long wavelength limit known as hydrodynamics. We review the study of strongly-coupled rotating fluids using holography, and we examine the hydrodynamics emerging from the study of rotating Myers-Perry black holes. We discuss three regimes in which holographic rotating fluids display either (1) hydrodynamic behavior of a boosted fluid, (2) hydrodynamic behavior distinct from a boosted fluid, or (3) no obvious hydrodynamic behavior. We describe techniques to obtain hydrodynamic and non-hydrodynamic modes, and we compute the radius of convergence for the hydrodynamic regimes. The limitations of hydrodynamics under rotation are discussed alongside our findings.

   ↳ hep-thgr-qchep-phnucl-ex+1PPNP(2024)·12 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.