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1. Polarized QED cascades

   https://doi.org/10.1088/1367-2630/abf584  

   Seipt, Daniel ; Ridgers, Christopher P. ; Del Sorbo, Dario ; Thomas, Alec G. R. ( May 2021 , New Journal of Physics)

   By taking the spin and polarization of the electrons, positrons and photons into account in the strong-field QED processes of nonlinear Compton emission and pair production, we find that the growth rate of QED cascades in ultra-intense laser fields can be substantially reduced. While this means that fewer particles are produced, we also found them to be highly polarized. We further find that the high-energy tail of the particle spectra is polarized opposite to that expected from Sokolov–Ternov theory, which cannot be explained by just taking into account spin-asymmetries in the pair production process, but results significantly from ‘spin-straggling’. We employ a kinetic equation approach for the electron, positron and photon distributions, each of them spin/polarization-resolved, with the QED effects of photon emission and pair production modelled by a spin/polarization dependent Boltzmann-type collision operator. For photon-seeded cascades, depending on the photon polarization, we find an excess or a shortage of particle production in the early stages of cascade development, which provides a path towards a controlled experiment. Throughout this paper we focus on rotating electric field configuration, which represent an idealized model and allows for a straightforward interpretation of the observed effects.

    

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2. Enabling elliptically polarized high harmonic generation with short cross polarized laser pulses

   https://doi.org/10.1038/s41598-023-39814-y  

   Ghomashi, B. ; Walker, S. ; Becker, A. ( August 2023 , Scientific Reports)

   Enabling elliptically polarized high-order harmonics overcomes a historical limitation in the generation of this highly nonlinear process in atomic, molecular and optical physics with applications in other branches. Here, we shed new light on a controversy between experimental observations and theoretical predictions on the possibility to generate harmonics with large ellipticity using two bichromatic laser pulses which are linearly polarized in orthogonal directions. Results of numerical calculations confirm the previous experimental data that in short laser pulses even harmonics with large ellipticity can be obtained for the interaction of such cross-polarized laser pulses with atoms initially in as- orp-state, while odd harmonics have low ellipticity. The amount of the ellipticity can be controlled via the relative carrier-envelope phase of the pulses, their intensity ratio and the duration of the pulses.

    

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3. Polarized jet fragmentation functions

   https://doi.org/10.1016/j.physletb.2020.135756  

   Kang, Zhong-Bo ; Lee, Kyle ; Zhao, Fanyi ( October 2020 , Physics Letters B)

   null (Ed.)
4. Search for polarized antiproton production

   https://doi.org/10.1007/s10751-019-1565-z  

   Grzonka, D. ; Alfs, D. ; Asaturyan, A. ; Carmignotto, M. ; Diermaier, M. ; Eyrich, W. ; Głowacz, B. ; Hauenstein, F. ; Horn, T. ; Kilian, K. ; et al ( June 2019 , Hyperfine Interactions)
5. General relativistic polarized Proca stars

   https://doi.org/10.1103/PhysRevD.109.024019  

   Wang, Zipeng ; Helfer, Thomas ; Amin, Mustafa A ( January 2024 , Physical Review D)