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

Recent fits of electroweak precision data to the Standard Model (SM) with a4th sequential family (SM4) point to a possible "three-prong compositesolution": (1) the Higgs mass is at the TeV-scale, (2) the masses of the 4thfamily quarks t',b' are of O(500) GeV and (3) the mixing angle between the 4thand 3rd generation quarks is of the order of the Cabibbo angle, \theta_{34} ~O(0.1). Such a manifestation of the SM4 is of particular interest as it maysuggest that the Higgs is a composite state, predominantly of the 4thgeneration heavy quarks. Motivated by the above, we show that the three-prongcomposite solution to the SM4 can have interesting new implications for Higgsphenomenology. For example, the Higgs can decay to a single heavy 4thgeneration quark via the 3-body decays (through an off-shell t' or b') H ->t'(bar) t'* -> t'(bar) b W+ and H -> b'(bar) b'* -> b'(bar) t W-. These flavordiagonal decays can be dramatically enhanced at the LHC (by several orders ofmagnitudes) due to the large width effects of the resonating heavy Higgs in theprocesses gg -> H -> t'(bar) t'* -> t'(bar) b W+ and gg -> H -> b'(bar) b'* ->b'(bar) t W-, thus yielding a viable signal above the corresponding continuumQCD production rates. In addition, the Higgs can decay to a single t' and b' inthe loop-generated flavor changing (FC) channels H -> b' b(bar), t' t(bar).These FC decays are essentially "GIM-free" and can, therefore, have branchingratios as large as 10^{-4} - 10^{-3}.

Collider signals of a composite Higgs in the Standard Model with four generations