The Chiral Restoration Transition of QCD and Low Mass Dileptons

Rapp, Ralf; Wambach, J.; Hees, Hendrik van

doi:10.1007/978-3-642-01539-7_6

Cited by 108 publications

(152 citation statements)

References 183 publications

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“…The cocktail simulations purposely exclude contributions from ρ mesons. Instead, these are explicitly included in the model calculations by Rapp [2,23] which involve in-medium modifications of the ρ meson spectral shape. In this model a complete evolution of the QGP and thermal dilepton rates in the QGP and hadron-gas (HG) phases are convoluted with an isentropic fireball evolution.…”

Section: Dielectron Measurements In the Beam Energy Scanmentioning

confidence: 99%

“…The spectral line shape of these mesons may reveal imprints of in-medium modifications possibly related to chiral symmetry restoration. Here, the ρ meson is of special interest given that in thermal equilibrium its yield dominates that of the ω and φ mesons [2], and given its relatively short lifetime which is less than the expected lifetime of the system. In the intermediate mass range (IMR; 1.1 < M ll < 3 GeV/c 2 ), the production of dileptons is closely related to the thermal radiation of the Quark-Gluon Plasma (QGP).…”

Section: Introductionmentioning

confidence: 99%

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The STAR Dilepton Physics Program

Geurts

2013

Nuclear Physics A

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Dileptons provide ideal penetrating probes of the evolution of strongly-interacting matter. With the Time-of-Flight upgrade, STAR is in a unique position to provide large-acceptance dielectron measurements. We discuss preliminary dielectron results for Au+Au collisions at √ s NN =19.6 -200 GeV, and compare to recent model calculations. With upcoming detector upgrades STAR will further improve its dielectron measurements as well as include dimuon measurements.

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Section: Dielectron Measurements In the Beam Energy Scanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The STAR Dilepton Physics Program

Geurts

2013

Nuclear Physics A

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“…Thermally produced dileptons and photons are important experimental observables to study the the quark gluon plasma medium produced in current heavy-ion-experiments at LHC and RHIC [1]. Both quantities are related to the vector meson spectral function and therefore indirectly to the vector correlation function.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of electrical conductivity and dilepton rates from hot quenched lattice QCD

Kaczmarek

Müller²

2014

Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013)

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We present new results on the continuum extrapolation of the vector current correlation function in the deconfined phase for three temperatures close to the critical temperature utilizing quenched clover improved Wilson fermions and light quark masses. A systematic analysis on multiple lattice spacing allows to perform the continuum limit of the correlation function and to extract spectral properties in the continuum limit. These results provide constraints for the electrical conductivity and the thermal dilepton rates in the quark gluon plasma for the given temperature range. In addition results on the continuum extrapolation at finite momenta related to thermal photon rates are presented.

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“…] β yields the rate in [14] and by (iii) 2ImW T µν /(1 + e βq 0 ) where W T µν = i d 4 x e iq·x T J h µ (x)J h ν (0) β gives the rate in [15]. The rate given by eq.…”

Section: Dilepton Emission Rate and The Current Correlation Functionmentioning

confidence: 99%

“…The imaginary part is then put in eqs. (14) and then in eq. (3) to arrive at the dilepton emission rate [24] …”

Section: Dilepton Emission Rate and The Current Correlation Functionmentioning

confidence: 99%

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

Sarkar

Ghosh

2012

J. Phys.: Conf. Ser.

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Abstract.The ρ and ω meson self-energy at finite temperature and baryon density have been analysed for an exhaustive set of mesonic and baryonic loops in the real time formulation of thermal field theory. The large enhancement of spectral strength below the nominal ρ mass is seen to cause a substantial enhancement in dilepton pair yield in this mass region. The integrated yield after space-time evolution using relativistic hydrodynamics with quark gluon plasma in the initial state leads to a very good agreement with the experimental data from In-In collisions obtained by the NA60 collaboration. IntroductionColliding heavy ions at ultra-relativistic energies is the only way to produce and study bulk properties of strongly interacting matter. Systematic efforts, both theoretical and experimental over the last few decades [1,2] have addressed various facets of the thermodynamics of the underlying theory − QCD. The spectra of hadrons emitted after freeze-out of the fireball produced in heavy ion collisions have provided us with a wealth of information. This includes the recent discovery made by studying the elliptic flow of hadrons that the quark gluon plasma (QGP) produced in Au+Au collisions at RHIC actually behaves as a strongly interacting fluid [3] as opposed to a asymptotically free gas of quarks and gluons. However, by virtue of the fact that electromagnetic probes (real photons and dileptons) are emitted all through the lifetime of the fireball coupled with their low rescattering probability make them penetrating probes capable of mapping the space-time history of the collision [4]. Lepton pairs with both invariant mass and transverse momentum information are in fact preferable to real photons. Large mass pairs produced by Drell-Yan process and from the decays of heavy quarkonia are emitted early whereas pairs with low invariant mass radiated from thermal hadronic matter and Dalitz decays of hadrons are produced late in the collision. The invariant mass spectra of dileptons thus carry time information as displayed explicitly in [5] using the invariant mass dependence of the elliptic flow of lepton pairs.The rate of production of thermal dileptons is proportional to the two-point correlator of vector currents [6]. In the low invariant mass region which is dominated by lepton pairs produced during the later stages of the collision, dilepton emission takes place due to the decay of vector mesons. Consequently, the spectral properties of vector mesons, the ρ meson in particular has been a subject of intense discussion [7,4,2,8]. We find that it is only for the π − π loop that

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The Chiral Restoration Transition of QCD and Low Mass Dileptons

Cited by 108 publications

References 183 publications

The STAR Dilepton Physics Program

The STAR Dilepton Physics Program

Temperature dependence of electrical conductivity and dilepton rates from hot quenched lattice QCD

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

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