Hydrodynamic flow from fast particles

Casalderrey-Solana, Jorge; Teaney, Derek; Shuryak, Edward

doi:10.22323/1.030.0022

Cited by 21 publications

(40 citation statements)

References 23 publications

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“…The possible hydrodynamic collective response of the plasma to the passage of an energetic parton through it was characterized earlier in refs. [171][172][173][174]; the holographic computation in refs. [123,125] provided a concrete realization in a full quantum field theoretical calculation, confirming that the anticipated hydrodynamic response could indeed be excited via the passage through the fluid of an energetic probe whose size is much smaller than 1/T .…”

Section: Medium Backreaction: Observable Consequences Of a Wake In Thmentioning

confidence: 99%

“…[171][172][173][174] we shall treat the additional momentum acquired by the medium as a consequence of the passage of the jet as a small perturbation. (For studies of the nonlinear response of the plasma, see refs.…”

Section: Jhep03(2017)135mentioning

confidence: 99%

“…And, even if the modifications of the flow field induced by the wake are small their effect on the spectrum of particles produced at freezeout can be significant on the tail of the thermal distribution. Going beyond our simplified expressions (4.5) and (4.7) in order to improve upon our description of the semihard momentum regime requires taking account of the explicit space-time dependence of the hydrodynamic wake in the plasma [174]. It would be interesting to investigate the effect of the full flow profile as predicted by holographic computations of the hydrodynamic wake [123,125] on the final particle production spectrum to see how this modifies our results in the semi-hard momentum regime.…”

Section: Jhep03(2017)135mentioning

confidence: 99%

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Angular structure of jet quenching within a hybrid strong/weak coupling model

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

123

145

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Within the context of a hybrid strong/weak coupling model of jet quenching, we study the modification of the angular distribution of the energy within jets in heavy ion collisions, as partons within jet showers lose energy and get kicked as they traverse the strongly coupled plasma produced in the collision. To describe the dynamics transverse to the jet axis, we add the effects of transverse momentum broadening into our hybrid construction, introducing a parameter K ≡q/T 3 that governs its magnitude. We show that, because of the quenching of the energy of partons within a jet, even when K = 0 the jets that survive with some specified energy in the final state are narrower than jets with that energy in proton-proton collisions. For this reason, many standard observables are rather insensitive to K. We propose a new differential jet shape ratio observable in which the effects of transverse momentum broadening are apparent. We also analyze the response of the medium to the passage of the jet through it, noting that the momentum

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Section: Medium Backreaction: Observable Consequences Of a Wake In Thmentioning

confidence: 99%

Section: Jhep03(2017)135mentioning

confidence: 99%

Section: Jhep03(2017)135mentioning

confidence: 99%

See 1 more Smart Citation

Angular structure of jet quenching within a hybrid strong/weak coupling model

Casalderrey-Solana

Gulhan

Milhano

et al. 2017

J. High Energ. Phys.

123

145

View full text Add to dashboard Cite

show abstract

“…Instead, in position space, J n hydro probably has width comparable to Γ s (the attenuation length) and must be parametrized in some fashion. The authors of [1,36] used an equivalent of…”

Section: Relation To Linearized Hydrodynamicsmentioning

confidence: 99%

“…Further work [36] showed that for scenario 2 to match to data, the energy loss per distance needs to be chosen quite large-perhaps unrealistically so. Another study [51] included expansion of the plasma and used source terms similar to scenario 1.…”

Section: Jet-splitting and The Challenge Of Diffusion Wakesmentioning

confidence: 99%

Universality of the diffusion wake in the gauge-string duality

Gubser

Yarom

2008

Phys. Rev. D

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As a particle moves through a fluid, it may generate a laminar wake behind it. In the gauge-string duality, we show that such a diffusion wake is created by a heavy quark moving through a thermal plasma and that it has a universal strength when compared to the total drag force exerted on the quark by the plasma. The universality extends over all asymptotically anti-de Sitter supergravity constructions with arbitrary scalar matter. We discuss how these results relate to the linearized hydrodynamic approximation and how they bear on our understanding of di-hadron correlators in heavy ion collisions.

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Jet wake from linearized hydrodynamics

Casalderrey-Solana

Milhano

Pablos

et al. 2021

J. High Energ. Phys.

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We explore how to improve the hybrid model description of the particles originating from the wake that a jet produced in a heavy ion collision leaves in the droplet of quark-gluon plasma (QGP) through which it propagates, using linearized hydrodynamics on a background Bjorken flow. Jet energy and momentum loss described by the hybrid model become currents sourcing linearized hydrodynamics. By solving the linearized hydrodynamic equations numerically, we investigate the development of the wake in the dynamically evolving droplet of QGP, study the effect of viscosity, scrutinize energy-momentum conservation, and check the validity of the linear approximation. We find that linearized hydrodynamics works better in the viscous case because diffusive modes damp the energy-momentum perturbation produced by the jet. We calculate the distribution of particles produced from the jet wake by using the Cooper-Frye prescription and find that both the transverse momentum spectrum and the distribution of particles in azimuthal angle are similar in shape in linearized hydrodynamics and in the hybrid model. Their normalizations are different because the momentum-rapidity distribution in the linearized hydrodynamics analysis is more spread out, due to sound modes. Since the Bjorken flow has no transverse expansion, we explore the effect of transverse flow by using local boosts to add it into the Cooper-Frye formula. After including the effects of transverse flow in this way, the transverse momentum spectrum becomes harder: more particles with transverse momenta bigger than 2 GeV are produced than in the hybrid model. Although we defer implementing this analysis in a jet Monte Carlo, as would be needed to make quantitative comparisons to data, we gain a qualitative sense of how the jet wake may modify jet observables by computing proxies for two example observables: the lost energy recovered in a cone of varying open angle, and the fragmentation function. We find that linearized hydrodynamics with transverse flow effects added improves the description of the jet wake in the hybrid model in just the way that comparison to data indicates is needed. Our study illuminates a path to improving the description of the wake in the hybrid model, highlighting the need to take into account the effects of both transverse flow and the broadening of the energy-momentum perturbation in spacetime rapidity on particle production.

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Hydrodynamic flow from fast particles

Cited by 21 publications

References 23 publications

Angular structure of jet quenching within a hybrid strong/weak coupling model

Angular structure of jet quenching within a hybrid strong/weak coupling model

Universality of the diffusion wake in the gauge-string duality

Jet wake from linearized hydrodynamics

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