Anomalous soft photon production from the induced currents in Dirac sea

Abstract

The propagation of a high energy quark disturbs the confining QCD vacuum inducing the currents in Dirac sea. Since quarks possess electric charge, these induced vacuum quark currents act as a source of soft photon radiation. This can lead to the enhancement of the soft photon production above the expectations based on the charged hadron yields and the Low theorem. We illustrate the phenomenon by using the exactly soluble 1+1 dimensional massless Abelian gauge model that shares with QCD all of the ingredients involved in this mechanism: confinement, chiral symmetry breaking, axial anomaly, and the periodic $\theta$-vacuum. We show that the propagating quark throughout the process of hadronization induces in the vacuum charged transition currents that lead to a strong resonant enhancement of the soft photon yield; the Low theorem however remains accurate in the limit of very soft momenta. We then construct on the basis of our result a simple phenomenological model and apply it to the soft photon production in the fragmentation of jets produced in $Z^0$ decays. We find a qualitative agreement with the recent result from the DELPHI Collaboration.

14 pages, 2 figures

References in corpus (8)

• The Chiral Magnetic Effect
• Charge separation induced by P-odd bubbles in QCD matter
• Chiral Magnetic Wave
• Electromagnetic radiation by quark-gluon plasma in magnetic field
• Evidence for an Excess of Soft Photons in Hadronic Decays of Z^0
• Observation of the Muon Inner Bremsstrahlung at LEP1
• Quark fragmentation in the $\theta$-vacuum
• Spin Polarized Photons and Di-leptons from Axially Charged Plasma

Cited by in corpus (20)

• The Chiral Magnetic Effect and Anomaly-Induced Transport
• Implementing quantum electrodynamics with ultracold atomic systems
• Real-time simulation of the Schwinger effect with Matrix Product States
• Real-time chiral dynamics from a digital quantum simulation
• Real-time non-perturbative dynamics of jet production: quantum entanglement and vacuum modification
• The Magneto-Sono-Luminescence and its signatures in photon and dilepton production in heavy ion collisions
• Quantum simulation of entanglement and hadronization in jet production: lessons from the massive Schwinger model
• Open string QED meson description of the X17 particle and dark matter
• Probing the spacetime evolution of heavy ion collisions with photons and dileptons
• Connecting real-time properties of the massless Schwinger model to the massive case
• An Overview of the Anomalous Soft Photons in Hadron Production
• Partial restoration of chiral symmetry in a confining string
• Direct photon spectrum and elliptic flow produced from Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV at the CERN Large Hadron Collider within an integrated hydrokinetic model
• On the stability of the open-string QED neutron and dark matter
• Particle production and hadronization temperature in the massive Schwinger model
• Photon spectra and anisotropic flow in heavy ion collisions at the top RHIC energy within the integrated hydrokinetic model with photon hadronization emission
• Dynamics of quarks and gauge fields in the lowest-energy states in QCD and QED
• On the question of quark confinement in the Abelian U(1) QED gauge interaction
• QED meson description of the anomalous particles at ~17 and ~38 MeV
• Soft photon production from real-time dynamics of jet fragmentation