Collinear Factorisation in e+e- Collisions

This lecture by the instructor covers the topic of collinear factorisation in e+e- collisions, focusing on the challenges and techniques involved in achieving high precision predictions. The presentation discusses the importance of resumming large logarithms, the differences between YFS and collinear factorisation, and the impact of precision tools on meeting accuracy targets. The lecture also delves into the symbolic representation of generic cross sections, the evolution of PDFs, and the implications of different factorisation and renormalisation schemes. The instructor emphasizes the need for upgrading PDF accuracy and including NLL contributions for sensible phenomenology, particularly in the context of future ete¯ colliders.