Quenching of hadron and photon spectra in heavy-ion collisions from RHIC to LHC

Arleo, François

doi:10.1088/0954-3899/38/12/124017

Cited by 4 publications

(5 citation statements)

References 56 publications

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“…The real photons generated by an ideal hydrodynamic evolution are considered first, and the results are shown on the left panel of figure 1. To set the scale, only a few photon channels are shown and the fragmentation component of primordial nucleon-nucleon collisions has been assumed suppressed [12]. The right panel quantifies the influence of viscous effects on the net thermal photon spectrum.…”

Section: Hydrodynamical Evolution and Resultsmentioning

confidence: 99%

Photons at the RHIC: the role of viscosity and of initial state fluctuations

Dion

Gale

Jeon

et al. 2011

J. Phys. G: Nucl. Part. Phys.

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We study real photons produced in heavy ion collisions at RHIC, and we calculate their spectrum and its azimuthal momentum anisotropy. The photons from a variety of sources are included, and the interplay and the time-evolution of those sources are modelled in a full 3D hydrodynamic simulation. We quantify the v 2 of thermal photons produced in ideal and viscous fluids, and the consequences of using different initial conditions are explored.

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Section: Hydrodynamical Evolution and Resultsmentioning

confidence: 99%

Photons at the RHIC: the role of viscosity and of initial state fluctuations

Dion

Gale

Jeon

et al. 2011

J. Phys. G: Nucl. Part. Phys.

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“…Here, we analyze the medium-induced color flow in a standard parton-energy-loss calculation. Compared to the current modeling of parton energy loss [2][3][4][5][6][7], this will be seen to result in a characteristic softening of the ensuing hadronization. It may, thus, affect significantly the extraction of medium properties from the measured nuclear modification factor at the LHC [8][9][10].…”

mentioning

confidence: 98%

“…This has been used in several recent studies [2][3][4][5][6][7] to constrain medium properties entering the modeling of parton energy loss. It is a common feature of all these models to assume gluon exchanges between the projectile parton and the medium, while neglecting in their dynamical implementation the ensuing changes in the color structure of the parton shower.…”

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confidence: 99%

Medium-induced color flow softens hadronization

2012

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Medium-induced parton energy loss, resulting from gluon exchanges between the QCD matter and partonic projectiles, is expected to underlie the strong suppression of jets and high-p T hadron spectra observed in ultrarelativistic heavy-ion collisions. Here, we present the first color-differential calculation of parton energy loss. We find that color exchange between medium and projectile decoheres the color of radiated gluons from that of the most energetic fragments and enhances parametrically the invariant mass of energetic color singlet clusters in the parton shower. These effects are seen in more than half of the medium-modified parton branchings. As shown for a cluster hadronization model and as argued for a Lund string fragmentation model, this leads to additional softening of hadronic spectra. Compared to standard parton energy loss calculations, a lower density of the QCD matter is then needed to account for the nuclear modification factor at the Large Hadron Collider. High-transverse-momentum partons (p T 10 GeV) produced in heavy-ion collisions interact with the QCD matter in the collision region while branching. This interaction is thought to cause the strong medium modification of hadronic spectra and jets measured in heavy-ion collisions at the Large Hadron Collider (LHC) and at the Relativistic Heavy Ion Collider. The modeling of this jet quenching phenomenon has focused so far on medium-induced parton energy loss prior to hadronization [1], assuming that, for sufficiently high p T , hadronization occurs time delayed and thus outside the medium. However, if the color flow of a parton shower is modified within the medium, then hadronization can be affected irrespective of when it occurs. Here, we analyze the medium-induced color flow in a standard parton-energy-loss calculation. Compared to the current modeling of parton energy loss [2][3][4][5][6][7], this will be seen to result in a characteristic softening of the ensuing hadronization. It may, thus, affect significantly the extraction of medium properties from the measured nuclear modification factor at the LHC [8][9][10].We start by considering an elementary building block of a parton shower, the q → q g parton splitting. For a small light-cone energy k + of the gluon compared to the parent parton, x ≡ k + /p + 1, and for transverse gluon momentum k with K 0 ≡ k/k 2 , the gluon spectrum reads, to leading order in α s ,In the presence of QCD matter, interactions between projectile parton and medium result in a modified spectrum dI rad ≡ dI vac + dI med that can be written as an expansion in powers of the ratio ζ ≡ L + /λ + el of the in-medium path length L + and an elastic mean free path λ + el (for details, see Ref.[1]). To first order in this opacity expansion, the medium-induced radiation spectrum readswhere · · · denotes averaging over the transverse-momentum transfer q of a single interaction andMedium-induced interference effects enter via the factorThus, the medium-modification dI med can occur only for quanta of sufficiently small formation...

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“…In heavy ion experiments highly energetic electromagnetic probes, such as photons and dileptons, provide important information on the evolution and eventual thermalization of the produced plasma (for reviews, see e.g. [1,2]). This is due in particular to their weak coupling to the plasma constituents, which implies that once produced, they are free to propagate through the plasma almost unaltered.…”

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confidence: 99%

Production of prompt photons: Holographic duality and thermalization

et al. 2012

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We study the production of prompt photons in strongly coupled out-of-equilibrium Super Yang-Mills plasma using the AdS/CFT correspondence. Our goal is to determine the photon emission spectrum at different stages of a thermalization process, which is modeled via the gravitational collapse of a thin spherical shell in AdS5 space. Particular emphasis is placed on the limit of large frequencies, which we are able to treat analytically.

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Quenching of hadron and photon spectra in heavy-ion collisions from RHIC to LHC

Cited by 4 publications

References 56 publications

Photons at the RHIC: the role of viscosity and of initial state fluctuations

Photons at the RHIC: the role of viscosity and of initial state fluctuations

Medium-induced color flow softens hadronization

Production of prompt photons: Holographic duality and thermalization

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