Viscous photons in relativistic heavy ion collisions

Dion, Maxime; Paquet, Jean-François; Schenke, Bjoern; Young, Clint; Jeon, Sangyong; Gale, Charles

doi:10.1103/physrevc.84.064901

Cited by 102 publications

(126 citation statements)

References 62 publications

Supporting

Mentioning

117

Contrasting

Order By: Relevance

“…The hadron gas (HG) phase is modeled as an interacting meson gas within the SU(3) × SU(3) massive Yang-Mills approach used in previous studies (see, e.g., Refs. [12,31,32]). At tree level, this formalism contributes 8 photon-producing reaction channels involving π, K, ρ, ω, and a 1 mesons [33].…”

Section: Viscous Corrections To Thermal Photon Emission Ratesmentioning

confidence: 99%

“…Off-equilibrium corrections to photon emission rates were studied before [10,12,24], but only including the viscous corrections to the distribution functions of the particles involved in the radiation process. In the QGP, where collisions are caused by the exchange of (originally massless) gluons, dynamically generated (socalled Hard Thermal Loop (HTL)) self energies must be taken into account to regulate an infrared divergence caused by very soft collisions.…”

Section: Viscous Corrections To Thermal Photon Emission Ratesmentioning

confidence: 99%

“…We focus not just on the "elliptic flow" v 2 studied in previous work [7,[9][10][11][12][13][14][15], but also on the higher harmonic flow coefficients v 3,4,5 , and on the "directed flow" v 1 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

et al. 2015

Self Cite

View full text Add to dashboard Cite

We present state-of-the-art calculations of viscous photon emission from nuclear collisions at RHIC and LHC. Fluctuating initial density profiles are evolved with event-by-event viscous hydrodynamics. Momentum spectra of thermal photons radiated by these explosively expanding fireballs and their pT -differential anisotropic flow coefficients vn(pT ) are computed, both with and without accounting for viscous corrections to the standard thermal emission rates. Viscous corrections to the rates are found to have a larger effect on the vn coefficients than the viscous suppression of hydrodynamic flow anisotropies. The benefits of taking the ratio of elliptic to triangular flow, v2/v3, are discussed, and the spacetime regions which contribute dominantly to the photon flow harmonics are identified. The directed flow v1 of thermal photons is predicted for RHIC and LHC energies.

show abstract

Section: Viscous Corrections To Thermal Photon Emission Ratesmentioning

confidence: 99%

Section: Viscous Corrections To Thermal Photon Emission Ratesmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…One missing ingredient is the viscous correction of the thermal distribution when it is sampled for the subsequent UrQMD run. This will be implemented in the near future although the viscous correction is not expected to be large at around T = 170 MeV for moderate values of p T [23]. In this work, we present our preliminary results with previously tuned values of the hydrodynamics parameters.…”

Section: Urqmd Afterburnermentioning

confidence: 61%

“…When freezing out at about T = 140 MeV without the afterburner, the Cooper-Frye formula is used to get the final state hadronic spectrum with the full resonance decays adapted from Heinz and Kolb's 2-D scheme. This Cooper-Frye procedure includes the viscous correction [23]. RHIC result is based on 10,000 events (100 UrQMD events on each of 100 hydro events) events and LHC result is based on 1,000 events (10 UrQMD events on each of 100 hydro events).…”

Section: +1d Event-by-event Viscous Hydrodynamicsmentioning

confidence: 99%

MUSIC with the UrQMD Afterburner

et al. 2013

Self Cite

View full text Add to dashboard Cite

As RHIC is entering the precision measurement era and the LHC is producing a copious amount of new data, the role of 3+1D event-by-event viscous hydrodynamics is more important than ever to understand the bulk data as well as providing the background for hard probes. For more meaningful comparison with the experimental data, it is also important that hydrodynamics be coupled to the hadronic afterburner. In this proceeding we report on preliminary results of coupling MUSIC with UrQMD.

show abstract

Holographic photon production in heavy ion collisions

Iatrakis

Kiritsis

Shen

et al. 2017

J. High Energ. Phys.

View full text Add to dashboard Cite

The thermal-photon emission from strongly coupled gauge theories at finite temperature is calculated using holographic models for QCD in the Veneziano limit (V-QCD). The emission rates are then embedded in hydrodynamic simulations combined with prompt photons from hard scattering and the thermal photons from hadron gas to analyze the spectra and anisotropic flow of direct photons at RHIC and LHC. The results from different sources responsible for the thermal photons in QGP including the weakly coupled QGP (wQGP) from perturbative calculations, strongly coupled N = 4 super Yang-Mills (SYM) plasma (as a benchmark for reference), and Gubser's phenomenological holographic model are then compared. It is found that the direct-photon spectra are enhanced in the strongly coupled scenario compared with the ones in the wQGP, especially at high momenta. Moreover, both the elliptic flow and triangular flow of direct photons are amplified at high momenta for V-QCD and the SYM plasma. The results are further compared with experimental observations.

show abstract

Viscous photons in relativistic heavy ion collisions

Cited by 102 publications

References 62 publications

Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

Anisotropic flow of thermal photons as a quark-gluon plasma viscometer

MUSIC with the UrQMD Afterburner

Holographic photon production in heavy ion collisions

Contact Info

Product

Resources

About