Electromagnetic Probes

Tserruya, I.

doi:10.1007/978-3-642-01539-7_7

Cited by 19 publications

(20 citation statements)

References 150 publications

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“…dileptons and photons, are powerful tools to explore the early hot, dense stage of heavy-ion collisions as they are essentially unaffected by final-state interactions. Through their invariant mass and momentum distributions, they carry to the detector information about the conditions and properties of the environment in which they are emitted, thus providing a glimpse deep into the bulk of the strongly interacting matter created in these collisions [1,2]. In particular, dileptons have been suggested as probes of the quarkgluon plasma (QGP) that is expected to be produced during the early stage of heavy-ion collisions at SuperProton-Synchrotron (SPS) energies [3][4][5][6][7][8][9][10].…”

mentioning

confidence: 99%

Dilepton production in nucleus-nucleus collisions at top CERN Super Proton Synchrotron energy of 158AGeV within the parton-hadron-string dynamics transport approach

et al. 2011

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Dilepton production in In+In collisions at 158 A·GeV is studied within the microscopic partonhadron-string dynamics (PHSD) transport approach that incorporates explicit partonic degrees-offreedom, dynamical hadronization as well as the more familiar hadronic dynamics in the final reaction stages. A comparison to the data of the NA60 Collaboration shows that the measured dilepton yield is well described by including the collisional broadening of vector mesons, while simultaneously accounting for the electromagnetic radiation of the strongly coupled quark-gluon plasma (sQGP) via off-shell quark-antiquark annihilation, quark annihilation with additional gluon Bremsstrahlung and the gluon-Compton scattering mechanisms. In particular, the spectra in the intermediate mass range (1 GeV ≤ M ≤ 2.5 GeV) are dominated by quark-antiquark annihilation in the nonperturbative QGP. Also, the observed softening of the transverse mass spectra at intermediate masses (1 GeV ≤ M ≤ 2.5 GeV) is approximately reproduced. Furthermore, for dileptons of low masses (M < 0.6 GeV), we find a sizeable contribution from the quark annihilation with additional gluon bremsstrahlung, thus providing another possible window for probing the properties of the sQGP.PACS numbers: 25.75.Cj, 25.75.Nq, 24.85.+p,

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mentioning

confidence: 99%

Dilepton production in nucleus-nucleus collisions at top CERN Super Proton Synchrotron energy of 158AGeV within the parton-hadron-string dynamics transport approach

et al. 2011

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“…To describe various effects of hadron matter in a fireball with Local Parity Breaking (LPB), we must introduce the axial/ chiral chemical potential [10]. There are some experimental indications of an abnormal dilepton excess in the range of low invariant masses and rapidities and moderate values of the transverse momenta (see the review in [11]), which can be partially thought of as a result of LPB in the medium (the details can be found in [12]). In particular, in heavy-ion collisions at high energies, with raising temperatures and baryon densities, a metastable state can appear in the fireball with a nontrivial topological/axial charge T 5 , which is related to the gluon gauge field G i .…”

Section: Chiral Imbalance After Nuclear Collisionsmentioning

confidence: 99%

Decays of Light Mesons Triggered by Chiral Chemical Potential

Andrianov¹,

Andrianov²,

Espriu³

et al. 2017

Acta Phys. Pol. B Proc. Suppl.

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Light meson ( π, σ, a 0 ) properties in the environment with chiral imbalance are analyzed with the help of meson effective lagrangian associated with QCD. New spatial parity violating decays of scalar mesons arise as a result of mixing of π and a 0 mesons under influence of chiral charge density. The pion electromagnetic formfactor gets an unusual parity-odd contribution. Pion effective masses depend on their velocities and may vanish in flight. The possible determination of chiral chemical potential in heavy ion collisions based on above mentioned phenomena is discussed.

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“…In QCD matter, sphalerons are abundant [12] and induce the quark chirality non-conservation. There are some experimental indications of an abnormal dilepton excess in the range of low invariant masses and rapidities, and moderate values of the transverse momenta (see the review in [13]), which can be thought of as a result of LPB in the medium (the details can be found in [14]). In particular, in heavy-ion collisions at high energies, with raising temperatures and baryon densities, metastable state can appear in the fireball with a non-trivial topological/axial charge T 5 , which is related to the gluon gauge field G i…”

Section: Chiral Imbalance In Heavy-ions Collisionsmentioning

confidence: 99%

“…For this purpose, there should be analysed an effect of anomalous dilepton pair production in the range of low invariant masses and rapidities, and moderate transverse momenta which was established in a series of experiments with heavy-ion collisions in recent years [13]. It is well-known that the angular distribution of leptons carries the information on polarizations.…”

Section: Effective Meson Theories In Search Of Lpbmentioning

confidence: 99%

QCD with Chiral Chemical Potential: Models Versus Lattice

Andrianov¹,

Andrianov²,

Espriu³

2016

Acta Phys. Pol. B Proc. Suppl.

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An emergence of local spatial parity breaking (LPB) in central heavyion collisions (HIC) at high energies is discussed. The QCD phenomenology of LPB in the fireball is induced by a difference between the number densities of right-and left-handed chiral fermions which is triggered by a chiral (axial) chemical potential. For the description of peculiarities of LPB, a number of QCD-inspired models are considered and confronted to certain lattice results. In particular, from the meson effective Lagrangian, it is found that the lightest states may become massless and some scalars turn out to be stable. In experimental studies, the asymmetry in production of longitudinal and transverse polarized states of ρ and ω mesons for different values of the invariant mass can serve as a characteristic indication of local spatial parity breaking which can be derived from an abnormal yield of dilepton pairs in the PHENIX, STAR and ALICE collaborations.

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Electromagnetic Probes

Cited by 19 publications

References 150 publications

Dilepton production in nucleus-nucleus collisions at top CERN Super Proton Synchrotron energy of 158AGeV within the parton-hadron-string dynamics transport approach

Dilepton production in nucleus-nucleus collisions at top CERN Super Proton Synchrotron energy of 158AGeV within the parton-hadron-string dynamics transport approach

Decays of Light Mesons Triggered by Chiral Chemical Potential

QCD with Chiral Chemical Potential: Models Versus Lattice

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