English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

I answer a question that Roman Jackiw asked me, and I draw some lessons fromthe answer. The question is: why is the Sudakov form factor larger by a factorof two, if computed for off-shell fermions, in comparison to the on-shell case?The answer sheds some light on the interplay between infrared and collinearsingularities -- and the importance of factors of two.

On the Sudakov form factor, and a factor of two