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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Many extensions to the Standard Model predict gauge interactions withenhanced couplings to third generation quarks, especially the extremely heavytop quark\cite{theoretical}. These phenomena can lead to resonances in theproduction of $t\bar{t}$ pairs. In this note, a model-independent search forthe production of heavy resonances decaying into top-antitop quark pairs in thesemileptonic final state using pp collisions at $\sqrt s$ = 8 TeV recorded withthe CMS detector is presented.  The analysis focuses on the semileptonic decay channels into electrons ormuons and covers the range of 0.5-3 TeV in the invariant mass of the $t\bar{t}$pairs where the events present specific and different topologies. Therefore twodedicated analyses have been performed to achieve the best sensitivity on thewhole invariant mass range: the threshold analysis (0.5-2 TeV) which isoptimized for $t\bar{t}$ production at the kinematic production threshold,using standard top quark reconstruction techniques, and the boosted analysis(1-3 TeV) optimized for $t\bar{t}$ produced with high Lorentz boosts, usingdedicated techniques for boosted top quarks reconstruction.  No evidence of signal has been found. Thus the following limits at 95% C.L.on the production of non-SM particles in specific models are set: topcolorZ$^{\prime}$ bosons with a width of 1.2 (10) % of its mass are excluded formasses below 2.1 TeV (up to 2.7 TeV). In addition, Kaluza-Klein excitations ofa gluon with masses below 2.5 TeV in the Randall-Sundrum model are excluded.

Search for $t\bar{t}$ resonances in the semileptonic final state using pp collisions at $\sqrt s$ = 8 TeV recorded with the CMS detector