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

The two-loop massive operator matrix elements for the fermionic localtwist--2 operators with external massive fermion lines in QuantumElectrodynamics (QED) are calculated up to the constant terms in thedimensional parameter $\epsilon = D - 4$. We investigate the hypothesis of Ref.\cite{BBN} that the 2--loop QED initial state corrections to $e^+e^-$annihilation into a virtual neutral gauge boson, except power corrections of$O((m_f^2/s)^k), k \geq 1$, can be represented in terms of these matrixelements and the massless 2-loop Wilson coefficients of the Drell-Yan process.

Two-loop QED Operator Matrix Elements with Massive External Fermion Lines