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/

Global: Zendy Plus annual

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

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We calculate the four-top quark operator contributions to Higgs productionvia gluon fusion in the Standard Model Effective Field Theory. The four-topoperators enter for the first time via two-loop diagrams. Due to their chiralstructure they contain $\gamma_5$, so special care needs to be taken when usingdimensional regularisation for the loop integrals. We use two different schemesfor the continuation of $\gamma_5$ to $D$ space-time dimensions in ourcalculations and present a mapping for the parameters in the two schemes. Thisgenerically leads to an interplay of different operators, such as four-topoperators, chromomagnetic operators or Yukawa-type operators at the loop level.We validate our results by examples of matching onto UV models.

On $\gamma_5$ schemes and the interplay of SMEFT operators in the Higgs-gluon coupling