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Exotic decays of top partners with charge 5/3: bounds and opportunities

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arxiv 1907.05894 v2 pith:2MJQK5MQ submitted 2019-07-12 hep-ph

classification hep-ph
keywords decaysexoticchannelsfinalincludeopportunitiespartnersrightarrow
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Exotic decays of top partners in new bosons are the norm in realistic models of a composite Higgs. We focus on the custodial charge-$5/3$ partner, which normally decays exclusively into $tW^+$. The new channels include a colour-sextet, $X_{5/3} \to \bar{b} \pi_6$, as well as singly and doubly charged scalars, $X_{5/3} \to t \phi^+$, $b \phi^{++}$. We use existing same-sign lepton searches to show that the new final states are constrained at the same level as the standard one. At the same time, exotic final states also offer opportunities for improvement: examples include a hard photon in $X_{5/3}\rightarrow t\phi^+\rightarrow tW^+\gamma$ decays, and top-rich channels which arise in several exotic $X_{5/3}$ decays.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Electroweak phase transition with composite Higgs models: calculability, gravitational waves and collider searches

    hep-ph 2019-09 conditional novelty 6.0 of 10

    A strong first-order electroweak phase transition is impossible in SO(6)/SO(5) composite Higgs models under the minimal Higgs potential hypothesis, and requires undetermined UV operator contributions, as shown in a 6+...

  2. Exotic decays of top partners: mind the search gap

    hep-ph 2019-08 conditional novelty 6.0 of 10

    A top-partner search gap exists: for T -> t a with a -> gg, current LHC bounds drop from about 1.3 TeV to roughly 400-550 GeV.

  3. Dark matter in composite Higgs models with a scotogenic EFT

    hep-ph 2026-07 conditional novelty 5.0 of 10

    In the SU(6)/Sp(6) composite Higgs model with a scotogenic Z2, three of four neutral pseudo-Goldstone dark matter candidates can reproduce the observed relic density, while the SU(2)L triplet candidate fails; spin-1 r...

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