scholarly journals Photon polarization tensor in a magnetized plasma: Absorptive part

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Xinyang Wang ◽  
Igor Shovkovy
Keyword(s):  
Absorptive Part ◽  
Magnetized Plasma ◽  
Polarization Tensor ◽  
Photon Polarization

Photon polarization tensor and gauge dependence in three-dimensional quantum electrodynamics

1992 ◽  
Vol 46 (6) ◽  
pp. 2695-2702 ◽  
Author(s):  
Conrad J. Burden ◽  
Justin Praschifka ◽  
Craig D. Roberts
Keyword(s):  
Quantum Electrodynamics ◽  
Three Dimensional ◽  
Polarization Tensor ◽  
Photon Polarization ◽  
Gauge Dependence

ρ-Dominance Electromagnetic Pion Form Factor with Vacuum-Polarization Insertions

1972 ◽  
Vol 50 (2) ◽  
pp. 119-121 ◽  
Author(s):  
R. A. Buchl ◽  
B. P. Nigam
Keyword(s):  
Form Factor ◽  
Vacuum Polarization ◽  
Charged Pion ◽  
Absorptive Part ◽  
Pion Form Factor ◽  
Polarization Tensor ◽  
Vacuum Polarization Tensor

The ρ-meson propagator is modified by insertions of the vacuum-polarization tensor due to charged pion pairs. The sum of all such contributing graphs via the Duffin–Kemmer formalism is seen to give a Breit–Wigner-type expression for the electromagnetic pion form factor. The width of the ρ meson is associated with the absorptive part of the pion form factor and at t = mρ2 we estimate fρππ2/4π = 2.5 using the experimental width Γρ = 125 ± 20 MeV.

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

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Xinyang Wang ◽  
Igor Shovkovy
Keyword(s):  
Quark Gluon Plasma ◽  
Chemical Potential ◽  
Photon Emission ◽  
Absorptive Part ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Photon Production ◽  
Polarization Tensor ◽  
Baryon Chemical Potential ◽  
Wide Range

AbstractWe 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.

Sign in / Sign up

Export Citation Format

Share Document