Photons production in heavy-ion collisions as a signal of deconfinement phase

Nedelko, Sergei N.; Nikolskii, Aleksei

doi:10.1140/epja/s10050-023-00986-w

Cited by 4 publications

(6 citation statements)

References 42 publications

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“…The full expression for T(p, k) in the case of massive quarks and the details related to the limit of gluon momenta can be found in Ref. [15]. From Figure 4, One can see that an increase in the quark mass leads to a result that differs from the massless case.…”

Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 96%

“…where F l µνρ (p, k) denotes the tensor structure, F l (p, k) denotes the form factor (some of F l are shown in Figure 2). The full expression for each of the tensors and form factors can be found in our recent study [15]. The details of the calculation of the on-shell amplitude squared T(p, k) = |M| 2 (analytical continuation to Minkowsky space, integration of quark proper time s) are given in Ref.…”

Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 99%

“…The details of the calculation of the on-shell amplitude squared T(p, k) = |M| 2 (analytical continuation to Minkowsky space, integration of quark proper time s) are given in Ref. [15]. Let us now turn attention to a brief description of the results.…”

Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 99%

“…Importantly, the short-living strong magnetic field with a singled space direction generated in heavy ion collisions is a catalyst for deconfinement [11]; that is, the magnetic field induces the long-living chromomagnetic field with the same space direction. This paper is mainly based on our earlier study [15], for which the results are outlined below.…”

Section: Introductionmentioning

confidence: 99%

“…Some form factors, such as the function of transverse gluon momenta, p 2⊥ = k 2 ⊥ , for longitudinal momenta, p 2 || = k 2 || = 1.Dimensionless notations p 2 = p 2 /B and k 2 = k 2 /B are used, form factors F l (p, k) are dimensionless. See[15] for the detailed form of F l µνρ (p, k) and F l (p, k).…”

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confidence: 99%

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Photons as a Signal of Deconfinement in Hadronic Matter under Extreme Conditions

Nedelko

Nikolskii

2023

Physics

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The photon production by conversion of gluons gg→γ via quark loop in the framework of the mean-field approach to the QCD (quantunm chromodynamics) vacuum is studied here. According to the domain model of QCD vacuum, the confinement phase is dominated by Abelian (anti-)self-dual gluon fields, while the deconfinement phase is characterized by a strong chromomagnetic field. In the confinement phase, photon production is impossible due to the random spacial orientation of the statistical ensemble of vacuum fields. However, the conditions of Furry theorem are not satisfied in the deconfinement phase, the conversion of gluons is nonzero and, in addition, photon distribution has a strong angular anisotropy. Thus, the photon production in the discussed process acts as one of the important features of transition in quark-gluon plasma to the deconfinement phase.

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Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 96%

Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 99%

Section: Gluon Conversion and Photon Production In The Deconfinement ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Photons as a Signal of Deconfinement in Hadronic Matter under Extreme Conditions

Nedelko

Nikolskii

2023

Physics

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Two-gluon one-photon vertex in a magnetic field and its explicit one-loop approximation in the intermediate field strength regime

Ayala,

Bernal-Langarica,

Jaber-Urquiza

et al. 2024

Phys. Rev. D

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We find the general structure for the two-gluon one-photon vertex in the presence of a constant magnetic field. We show that, when accounting for the symmetries satisfied by the strong and electromagnetic interactions under parity, charge conjugation and gluon interchange, and for gluons and photons on mass-shell, there exist only three possible tensor structures that span the vertex. These correspond to external products of the polarization vectors for each of the particles in the vertex. We also explicitly compute the one-loop approximation to this vertex in the intermediate field strength regime, which is the most appropriate one to describe possible effects of the presence of a magnetic field to enhance photon emission during preequilibrium in peripheral relativistic heavy-ion collisions. We show that the most favored direction for the photon to propagate is in the plane transverse to the field, which is consistent with a positive contribution to ν2 and may help to understand the larger than expected elliptic flow coefficient measured in this kind of reaction. Published by the American Physical Society 2024

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Influence of magnetic field-induced anisotropic gluon pressure during pre-equilibrium in heavy-ion collisions: A faster road toward isotropization

Ayala,

Mizher

2024

Phys. Rev. D

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Magnetic fields of a large intensity can be generated in peripheral high-energy heavy-ion collisions. Although their intensity drops fast and, moreover, it is not clear whether these fields last long enough to induce a magnetization during the quark-gluon plasma phase, most of the models and simulations predict a significant intensity that lasts up to proper times of order 1 fm after the beginning of the reaction, which is a typical time for the hydrodynamical phase to start. This interval of time is referred to as the pre-equilibrium stage. The evolution of the reaction during pre-equilibrium is thus likely to be influenced by these fields. In this work we adopt a strong field approximation to study the effects of the magnetic field-induced anisotropy on the gluon pressure. We include this anisotropy within the description obtained by means of effective kinetic theory and explore the consequences to reach isotropization at proper times of order 1 fm. We show that when including the magnetic field effects, isotropization is achieved faster. Published by the American Physical Society 2024

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Photons production in heavy-ion collisions as a signal of deconfinement phase

Cited by 4 publications

References 42 publications

Photons as a Signal of Deconfinement in Hadronic Matter under Extreme Conditions

Photons as a Signal of Deconfinement in Hadronic Matter under Extreme Conditions

Two-gluon one-photon vertex in a magnetic field and its explicit one-loop approximation in the intermediate field strength regime

Influence of magnetic field-induced anisotropic gluon pressure during pre-equilibrium in heavy-ion collisions: A faster road toward isotropization

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