Bremsstrahlung in chiral medium: Anomalous magnetic contribution to the Bethe-Heitler formula

Hansen, Jeremy; Tuchin, Kirill

doi:10.1103/PhysRevD.105.116008

Title: Bremsstrahlung in chiral medium: Anomalous magnetic contribution to the Bethe-Heitler formula

Journal Article · Wed Jun 22 00:00:00 EDT 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.116008· OSTI ID:1873565

Hansen, Jeremy;

We investigate photon bremsstrahlung in chiral media. The chiral medium response to the magnetic field is described by the chiral magnetic current $j = b_{0} B$ , where $b_{0}$ is the chiral magnetic conductivity. This current modifies the photon dispersion relation producing a resonance in the scattering amplitude. We show that the resonant contribution is proportional to the magnetic moment $μ$ of the target nucleus. We analytically compute the corresponding cross section. We argue that the anomalous contribution is enhanced by a factor $b_{0}^{2} / Γ^{2}$ , where $Γ$ is a width of the resonance related to the chiral magnetic instability of the electromagnetic field. The most conspicuous feature of the anomalous contribution to the photon spectrum is the emergence of the kneelike structure at photon energies proportional to $b_{0}$ . We argue that the phenomenological significance of the anomalous terms depends on the magnitude of the ratio of $b_{0}$ to the projectile fermion mass.

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Research Organization:: Iowa State Univ., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-87ER40371

OSTI ID:: 1873565

Alternate ID(s):: OSTI ID: 1980115

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 11; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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