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

A search for flavor-changing neutral-current couplings between a top quark,an up or charm quark and a $Z$ boson is presented, using proton-protoncollision data at $\sqrt{s} = 13$ TeV collected by the ATLAS detector at theLarge Hadron Collider. The analyzed dataset corresponds to an integratedluminosity of 139 fb$^{-1}$. The search targets both single-top-quark eventsproduced as $gq\rightarrow tZ$ (with $q = u, c$) and top-quark-pair events,with one top quark decaying through the $t \rightarrow Zq$ channel. Theanalysis considers events with three leptons (electrons or muons), a $b$-taggedjet, possible additional jets, and missing transverse momentum. The data arefound to be consistent with the background-only hypothesis and 95%confidence-level limits on the $t \rightarrow Zq$ branching ratios are set,assuming only tensor operators of the Standard Model effective field theoryframework contribute to the $tZq$ vertices. These are $6.2 \times 10^{-5}$($13\times 10^{-5}$) for $t\rightarrow Zu$ ($t\rightarrow Zc$) for aleft-handed $tZq$ coupling, and $6.6 \times 10^{-5}$ ($12\times 10^{-5}$) inthe case of a right-handed coupling. These results are interpreted as 95% CLupper limits on the strength of corresponding couplings, yielding limits for$|C_{uW}^{(13)*}|$ and $|C_{uB}^{(13)*}|$ ($|C_{uW}^{(31)}|$ and$|C_{uB}^{(31)}|$) of 0.15 (0.16), and limits for $|C_{uW}^{(23)*}|$ and$|C_{uB}^{(23)*}|$ ($|C_{uW}^{(32)}|$ and $|C_{uB}^{(32)}|$) of 0.22 (0.21),assuming a new-physics energy scale $\Lambda_\text{NP}$ of 1 TeV.

physical review. d/physical review. d.

Search for flavor-changing neutral-current couplings between the top  quark and the $Z$ boson with proton-proton collisions at $\sqrt{s} = 13$ TeV  with the ATLAS detector