Space-time description of ultra-relativistic nuclear collisions in the QCD parton picture

Geiger, Klaus

doi:10.1016/0370-1573(95)96931-z

Cited by 222 publications

(218 citation statements)

References 157 publications

Supporting

Mentioning

211

Contrasting

Order By: Relevance

“…Geiger-Sriwastava [154,158,159] for SPS energy range. The use of these methods for RHIC or even LHC energies looks less convincing [155].…”

Section: How Is Energy and Matter Stopped?mentioning

confidence: 99%

Melting hadrons, boiling quarks

Rafelski

2015

Eur. Phys. J. A

View full text Add to dashboard Cite

Abstract. In the context of the Hagedorn temperature half-centenary I describe our understanding of the hot phases of hadronic matter both below and above the Hagedorn temperature. The first part of the review addresses many frequently posed questions about properties of hadronic matter in different phases, phase transition and the exploration of quark-gluon plasma (QGP). The historical context of the discovery of QGP is shown and the role of strangeness and strange antibaryon signature of QGP illustrated. In the second part I discuss the corresponding theoretical ideas and show how experimental results can be used to describe the properties of QGP at hadronization. The material of this review is complemented by two early and unpublished reports containing the prediction of the different forms of hadron matter, and of the formation of QGP in relativistic heavy ion collisions, including the discussion of strangeness, and in particular strange antibaryon signature of QGP.

show abstract

“…Geiger-Sriwastava [154,158,159] for SPS energy range. The use of these methods for RHIC or even LHC energies looks less convincing [155].…”

Section: How Is Energy and Matter Stopped?mentioning

confidence: 99%

Melting hadrons, boiling quarks

Rafelski

2015

Eur. Phys. J. A

View full text Add to dashboard Cite

show abstract

“…For a recent summary of measurements at RHIC see [14]. The S-matrix approach to calculating the photon yield from a QGP in local thermal equilibrium treats the plasma as stationary and with an infinite lifetime, while it is clear that QGP is a transient, non-equilibrium state [15,16]. Current theoretical understanding suggests that a QGP may be formed ∼ 1 fm/c after a nucleus-nucleus collision and thermalizes via parton-parton scattering.…”

Section: Introductionmentioning

confidence: 99%

Are direct photons a clean signal of a thermalized quark-gluon plasma?

Boyanovsky

Vega

2003

Phys. Rev. D

View full text Add to dashboard Cite

Direct photon production from a quark gluon plasma (QGP) in thermal equilibrium is studied directly in real time. In contrast to the usual S-matrix calculations, the real time approach is valid for a QGP that formed and reached LTE a short time after a collision and of finite lifetime (∼ 10 − 20 fm/c as expected at RHIC or LHC). We point out that during such finite QGP lifetime the spectrum of emitted photons carries information on the initial state. There is an inherent ambiguity in separating the virtual from the observable photons during the transient evolution of the QGP. We propose a real time formulation to extract the photon yield which includes the initial stage of formation of the QGP parametrized by an effective time scale of formation Γ −1 . This formulation coincides with the S-matrix approach in the infinite lifetime limit. It allows to separate the virtual cloud as well as the observable photons emitted during the pre-equilibrium stage from the yield during the QGP lifetime. We find that the lowest order contribution O(αem) which does not contribute to the S-matrix approach, is of the same order of or larger than the S-matrix contribution during the lifetime of the QGP for a typical formation time ∼ 1 fm/c. The yield for momenta 3 Gev/c features a power law fall-off ∼ T 3 Γ 2 /k 5 and is larger than that obtained with the S-matrix for momenta ≥ 4 Gev/c. We provide a comprehensive numerical comparison between the real time and S-matrix yields and study the dynamics of the build-up of the photon cloud and the different contributions to the radiative energy loss. The reliability of the current estimates on photon emission as well as theoretical uncertainties on the details of the initial state are discussed.

show abstract

“…They are complementary, and Monte-Carlo event generators [6,7,8] and hydrodynamical models [9] have been developed to facilitate the analysis of data using either production model.…”

Section: Introductionmentioning

confidence: 99%

Plasma production and thermalisation in a strong field

et al. 2001

View full text Add to dashboard Cite

Aspects of the formation and equilibration of a quark-gluon plasma are explored using a quantum kinetic equation, which involves a non-Markovian, Abelian source term for quark and antiquark production and, for the collision term, a relaxation time approximation that defines a time-dependent quasi-equilibrium temperature and collective velocity. The strong Abelian field is determined via the simultaneous solution of Maxwell's equation. A particular feature of this approach is the appearance of plasma oscillations in all thermodynamic observables. Their presence can lead to a sharp increase in the time-integrated dilepton yield.

show abstract

Space-time description of ultra-relativistic nuclear collisions in the QCD parton picture

Cited by 222 publications

References 157 publications

Melting hadrons, boiling quarks

Melting hadrons, boiling quarks

Are direct photons a clean signal of a thermalized quark-gluon plasma?

Plasma production and thermalisation in a strong field

Contact Info

Product

Resources

About