Hard dilepton production from a weakly magnetized hot QCD medium

Das, Aritra; Haque, Najmul; Mustafa, Munshi G.; Roy, P.

doi:10.1103/physrevd.99.094022

Cited by 24 publications

(10 citation statements)

References 69 publications

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“…[53,54], and in the weak field limit in Refs. [55,56]. Several interesting results have been also obtained by using the Ritus method and the real time formalism in Refs.…”

Section: Polarization Functionmentioning

confidence: 90%

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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“…[53,54], and in the weak field limit in Refs. [55,56]. Several interesting results have been also obtained by using the Ritus method and the real time formalism in Refs.…”

Section: Polarization Functionmentioning

confidence: 90%

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Wang

Shovkovy

et al. 2020

Phys. Rev. D

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“…There has been substantial progress in studies of the polarization effects in magnetized plasmas in recent years. In the regime of nonzero temperature, the polarization tensor was calculated in the lowest Landau level approximation [19] and the weak-field limit [20,21]. Some results beyond the Landau level approximation were obtained as well [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Polarization tensor of magnetized quark-gluon plasma at nonzero baryon density

Wang

Shovkovy

2021

Eur. Phys. J. C

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We derive a general expression for the absorptive part of the one-loop photon polarization tensor in a strongly magnetized quark-gluon plasma at nonzero baryon chemical potential. To demonstrate the application of the main result in the context of heavy-ion collisions, we study the effect of a nonzero baryon chemical potential on the photon emission rate. The rate and the ellipticity of photon emission are studied numerically as a function the transverse momentum (energy) for several values of temperature and chemical potential. When the chemical potential is small compared to the temperature, the rates of the quark and antiquark splitting processes (i.e., $$q\rightarrow q +\gamma $$ q → q + γ and $${\bar{q}}\rightarrow {\bar{q}} +\gamma $$ q ¯ → q ¯ + γ , respectively) are approximately the same. However, the quark splitting gradually becomes the dominant process with increasing the chemical potential. We also find that increasing the chemical potential leads to a growing total photon production rate but has only a small effect on the ellipticity of photon emission. The quark-antiquark annihilation ($$q+{\bar{q}}\rightarrow \gamma $$ q + q ¯ → γ ) also contributes to the photon production, but its contribution remains relatively small for a wide range of temperatures and chemical potentials investigated.

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“…Modification of QCD Debye mass and the two point correlation functions of quarks [25] and gluons [26][27][28] i.e., partons have been analyzed recently. Dilepton production rate from a hot magnetized QCD plasma [29][30][31][32][33][34][35][36] has been calculated. Photon is also considered as a good probe of the QGP medium as photon only interacts electromagnetically.…”

Section: Introductionmentioning

confidence: 99%

Soft contribution to the damping rate of a hard photon in a weakly magnetized hot medium

2020

Self Cite

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We consider weakly magnetized hot QED plasma comprising electrons and positrons.There are three distinct dispersive (longitudinal and two transverse) modes of a photon in a thermo-magnetic medium. At lowest order in coupling constant, photon is damped in this medium via Compton scattering and pair creation process. We evaluate the damping rate of hard photon by calculating the imaginary part of the each transverse dispersive modes in a thermo-magnetic QED medium. We note that one of the fermions in the loop of one-loop photon self-energy is considered as soft and the other one is hard. Considering the resummed fermion propagator in a weakly magnetized medium for the soft fermion and the Schwinger propagator for hard fermion, we calculate the soft contribution to the damping rate of hard photon. In weak field approximation the thermal and thermo-magnetic contributions to damping rate get separated out for each transverse dispersive mode. The total damping rate for each dispersive mode in presence of magnetic field is found to be reduced than that of the thermal one. This formalism can easily be extended to QCD plasma. * ritesh.ghosh@saha.ac.in

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Hard dilepton production from a weakly magnetized hot QCD medium

Cited by 24 publications

References 69 publications

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Ellipticity of photon emission from strongly magnetized hot QCD plasma

Polarization tensor of magnetized quark-gluon plasma at nonzero baryon density

Soft contribution to the damping rate of a hard photon in a weakly magnetized hot medium

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