3 papers
hep-ph2026
Self-consistent computation of pair production from non-relativistic effective field theories in the Keldysh-Schwinger formalism
Tobias Binder, Edward Wang
Sommerfeld-enhanced annihilation cross sections in the presence of nearly zero-energy bound states can become so large that perturbative partial-wave unitarity appears to be violat…
hep-ph2025
BSFfast: Rapid computation of bound-state effects on annihilation in the early Universe
Tobias Binder, Mathias Garny, Jan Heisig +1
Bound-state formation (BSF) can have a large impact on annihilation of new physics particles with long-range interactions in the early Universe. In particular, the inclusion of exc…
hep-ph2025
Towards a precision calculation of in the Standard Model IV: Estimating the impact of positronium formation
Tobias Binder, Marco Drewes, Yannis Georis +3
We present a first assessment of how the previously unexplored effect of positronium formation can impact on the value of the effective number of neutrino species in the Standard M…