Göttingen 2025 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Novel Accelerator Concepts IV and Applications

AKBP 10.3: Vortrag

Donnerstag, 3. April 2025, 16:45–17:00, ZHG004

Nonlinear Breit-Wheeler pair production using polarized photons from inverse Compton scattering — •Daniel Seipt¹, Mathias Samuelsson², and Tom Blackburn² — ¹Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — ²Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden

The production of electron-positron pairs from the collision of photons is one of the most elusive processes in QED. Observing multiphoton electron-positron pair production (the nonlinear Breit-Wheeler process) requires high-energy γ rays to interact with strong electromagnetic fields. In order for these observations to be as precise as possible, the γ rays would ideally be both mono-energetic and highly polarized. In this talk I will present Monte Carlo simulations of an experimental configuration that accomplishes this in two stages. First, a multi-GeV electron beam interacts with a moderately intense laser pulse to produce a bright, highly polarized beam of γ rays by inverse Compton scattering. Second, after removing the primary electrons, these γ rays collide with another, more intense, laser pulse in order to produce pairs. I will show that it is possible to measure the γ-ray polarization dependence of the nonlinear Breit-Wheeler process in near-term experiments, using a 100-TW class laser and currently available electron beams. Furthermore, it would also be possible to observe harmonic structure and the perturbative-to-nonperturbative transition if such a laser were colocated with a future linear collider.

Keywords: linear collider; high-intensity laser; strong-field QED; polarized gamma rays; nonlinear Breit-Wheeler pair production