Effect of the magnetic field on the photon radiation from quark–gluon plasma in heavy ion collisions

Захаров, Б. Г.

doi:10.1140/epjc/s10052-016-4451-8

Cited by 33 publications

(17 citation statements)

References 99 publications

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“…While the quantization is less important at large transverse momenta (i.e, k T ≳ ffiffiffiffiffiffiffiffi ffi jeBj p ), the emission still has a strong dependence on the direction relative to the magnetic field. In fact, similarly to the classical synchrotron radiation, the preferred direction of the photon emission at large k T is perpendicular to the magnetic field (i.e., in the reaction plane) [37,38].…”

Section: Introductionmentioning

confidence: 82%

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Ellipticity of photon emission from strongly magnetized hot QCD plasma

Wang

Shovkovy

et al. 2020

Phys. Rev. D

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By making use of an explicit representation for the imaginary part of the photon polarization tensor in terms of transitions between the Landau levels of light quarks, we study the angular dependence of direct photon emission from a strongly magnetized quark-gluon plasma. Because of the magnetic field, the leading order photon rate comes from the three processes of the zeroth order in the coupling constant α s : (i) the quark splitting (q → q þ γ), (ii) the antiquark splitting (q →q þ γ), and (iii) the quark-antiquark annihilation (q þq → γ). In a wide range of moderately high temperatures, T ≳ m π , and strong magnetic fields, jeBj ≳ m 2 π , the direct photon production is dominated by the two splitting processes. We show that the Landau-level quantization of quark states plays an important role in the energy and angular dependence of the photon emission. Among other things, it leads to a nontrivial momentum dependence of the photon ellipticity coefficient v 2 , which takes negative values at small transverse momenta and positive values at large transverse momenta. The crossover between the two regimes occurs around k T ≃ ffiffiffiffiffiffiffiffi ffi jeBj p. In application to heavy-ion collisions, this suggests that a large value of v 2 for the direct photons could be explained in part by the magnetic field in the quark-gluon plasma.

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Section: Introductionmentioning

confidence: 82%

“…It is reasonable to expect that a strong magnetic field, produced in noncentral heavy-ion collisions, can affect the photon emission [36][37][38]. Since the magnetic field is likely to be present during an extended period of the evolution of the fireball [1,2,39,40], all known sources of photon emission could be affected.…”

Section: Introductionmentioning

confidence: 99%

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Wang

Shovkovy

et al. 2020

Phys. Rev. D

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“…Hydrodynamical and transport calculations [9,12,13] obtain a better but still incomplete agreement with ALICE and PHENIX measurements, which motivates to explore new sources of photons in the different stages of the collision. At early stages, where a magnetic field can be generated in peripheral collisions, even new channels such as synchrotron radiation, bremsstrahlung and pair annihilation [14,15] are not enough to explain the measured photon excess.…”

Section: Introductionmentioning

confidence: 99%

Impact of the initial high gluon density on the prompt photon yield and $v2$ in heavy-ion collisions with magnetic fields

Ayala¹,

Castaño-Yepes²,

Domínguez³

et al. 2019

Proceedings of 12th International Workshop on High-pT Physics in the RHIC/LHC Era — PoS(High-pT2017)

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We compute prompt photon production from gluon fusion in the presence of a magnetic field in semi-central relativistic heavy-ion collisions. The main ingredient is the treatment of the high gluon density at early stages of the collision where intense magnetic fields are also present. The magnetic field opens new channels for photon production that are forbidden otherwise. The elliptic flow coefficient v 2 is also computed. The calculation takes into account the saturation scale and phenomenological factors. Overall, the treatment gives a good description of the excess photon yield and v 2 , particularly at low values of photon transverse momentum.

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“…On the other hand, it has been argued that intense magnetic fields can be produced in peripheral heavy-ion collisions. Possible signatures of the presence of such fields in the interaction region can be the chiral magnetic effect [14] or the enhanced production of prompt photons [15][16][17][18]. Moreover, magnetic fields can have an impact on the properties of compact astrophysical objects, such as neutron stars [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal corrections to the gluon magnetic Debye mass

et al. 2020

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We compute the gluon polarization tensor in a thermo-magnetic environment in thestrong magnetic field limit at zero and high temperature. The magnetic field effects are introduced using Schwinger's proper time method. Thermal effects are computed in the HTL approximation. At zero temperature, we reproduce the well-known result whereby for a non-vanishing quark mass, the polarization tensor reduces to the parallel structure and its coefficient develops an imaginary part corresponding to the threshold for quark-antiquark pair production. This coefficient is infrared finite and simplifies considerably when the quark mass vanishes. Keeping always the field strength as the largest energy scale, in the high temperature regime we analyze two complementary hierarchies of scales: $q^2<< m_f^2<< T^2$ and $m_f^2<< q^2<< T^2$. In the latter, we show that the polarization tensor is infrared finite as $m_f$ goes to zero. In the former, we discuss the thermal corrections to the magnetic Debye mass.

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Effect of the magnetic field on the photon radiation from quark–gluon plasma in heavy ion collisions

Cited by 33 publications

References 99 publications

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Impact of the initial high gluon density on the prompt photon yield and $v2$ in heavy-ion collisions with magnetic fields

Thermal corrections to the gluon magnetic Debye mass

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