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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The rare K -> pi nu anti-nu decays play a central role in testing theStandard Model and its extensions. Upcoming experiments plan to measure thedecay rates with high accuracy. Yet, unknown higher-order electroweakcorrections result in a sizeable theory error. We remove this uncertainty bycomputing the full two-loop electroweak corrections to the top-quarkcontribution X_t to the rare decays K_L -> pi0 nu anti-nu, K+ -> pi+ nuanti-nu, and B -> X_{d,s} nu anti-nu in the Standard Model. The remainingtheoretical uncertainty related to electroweak effects is now far below 1%.Finally we update the branching ratios to find Br(K_L -> pi0 nu anti-nu) =2.43(39)(6) * 10^-11 and Br(K+ -> pi+ nu anti-nu) = 7.81(75)(29) * 10^-11. Thefirst error summarises the parametric, the second the remaining theoreticaluncertainties.

Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays