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Radiation beyond the soft approximation

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If you have a question about this talk, please contact Alexander Mitov.

It is well-known that large logarithms arise in scattering amplitudes at all orders in perturbation theory, that have to be summed up to all orders (“resummed”) in order to produce reliable collider predictions. These terms arise when emitted gauge bosons become “soft” (have zero 4-momentum), and many approaches exist for classifying them. Until recently, much less was known about how to go beyond this approximation. This is important for improving the precision of QCD predictions, but also has more formal applications. In this talk, I will summarise work done in this area, and present a recently obtained factorisation formula for next-to-soft and collinear effects. If time permits, I will also look at relations between QCD and gravity.

This talk is part of the Cavendish HEP Seminars series.

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