Hunting for vectorlike quarks

Scalar singlet dark matter in anomaly-free composite Higgs models is accompanied by exotic particles to which the dark matter annihilates. The latter can therefore freeze out even in the absence of couplings to the Standard Model. In this regime, both current and future direct detection constraints can be avoided. Moreover, due to the different decay modes of the extra particles, the dark matter candidate can even escape indirect detection constraints. Assessing this issue requires dedicated simulations of the gamma ray spectrum, that we provide in the present article in the context of SO(7)/SO(6). For the parameter space region that evades constraints from dark matter experiments, we develop new analyses to be performed at a future 100 TeV collider based on the search of the new particles produced in the decay of heavy vector-like quarks.

Section: Jhep07(2020)128mentioning

confidence: 99%

Composite dark matter phenomenology in the presence of lighter degrees of freedom

Ramos

2020

“…Thus, if the decay channels through heavy Higgs bosons are kinematically open, these can dominate even for very small values of all Yukawa couplings. Large branching ratios for t 4 → Ht, H ± b and b 4 → Hb, H ± t, even close to 100%, are abundant in random scans of these couplings [8].…”

Section: Jhep07(2020)241mentioning

confidence: 99%

“…This has been studied in detail in ref. [8], where a complete extension of the type-II 2HDM by vectorlike quarks with the same quantum numbers as SM quarks (and corresponding conjugate states) was considered. A description of the model, all the relevant formulas for couplings of Higgs and gauge bosons together with a detailed discussion of cascade decays of vectorlike quarks (assuming they dominantly mix with the third generation of SM quarks) can be found there.…”

Section: Decays Of Vectorlike Quarks Through Heavy Higgs Bosonsmentioning

confidence: 99%

“…Although the limits will certainly improve with larger data sets, even with 3 ab −1 of integrated luminosity it is not expected that the LHC would constrain the charged Higgs boson significantly in this range. 1 In extensions of two Higgs doublet models with vectorlike quarks, the decays of vectorlike quarks may easily be dominated by cascade decays through charged or neutral Higgs bosons leading to signatures with 6 top or bottom quarks [8], see figure 1. The heavy Higgs bosons are effectively pair produced with QCD size cross sections and lead to final states with very small irreducible SM background (the dominant background happens to originate from QCD multi-jet final states).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Signals with six bottom quarks for charged and neutral Higgs bosons

Dermíšek

Lunghi

McGinnis

et al. 2020

Self Cite

In extensions of two Higgs doublet models with vectorlike quarks, the decays of vectorlike quarks may easily be dominated by cascade decays through charged or neutral Higgs bosons leading to signatures with 6 top or bottom quarks. Since top quark decays also contain bottom quarks, a common signature for many possible decay chains is 6 bottom quarks in the final state. We present a search strategy focusing on this final state and find the mass ranges of vectorlike quarks and Higgs bosons that can be explored at the Large Hadron Collider. Among other results, the sensitivity to the charged and neutral Higgs bosons, extending to about 2 TeV, stands out when compared to models without vectorlike matter.

“…One can also apply the idea that χ1 and χ2 transform under different representations of a dark gauge group with a mass mixing, inspired from refs [66][67][68][69][70]. …”

mentioning

confidence: 99%

Optimizing energetic light dark matter searches in dark matter and neutrino experiments

Kim

Machado

Park

et al. 2020

Self Cite

Neutrino and dark matter experiments with large-volume (1 ton) detectors can provide excellent sensitivity to signals induced by energetic light dark matter coming from the present universe. Taking boosted dark matter as a concrete example of energetic light dark matter, we scrutinize two representative search channels, electron scattering and proton scattering including deep inelastic scattering processes, in the context of elastic and inelastic boosted dark matter, in a completely detector-independent manner. In this work, a dark gauge boson is adopted as the particle to mediate the interactions between the Standard Model particles and boosted dark matter. We find that the signal sensitivity of the two channels highly depends on the (mass-)parameter region to probe, so search strategies and channels should be designed sensibly especially at the earlier stage of experiments. In particular, the contribution from the boosted-dark-matter-initiated deep inelastic scattering can be subleading (important) compared to the quasi-elastic proton scattering, if the mass of the mediator is below (above) O(GeV). We demonstrate how to practically perform searches and relevant analyses, employing example detectors such as DarkSide-20k, DUNE, Hyper-Kamiokande, and DeepCore, with their respective detector specifications taken into consideration. For other potential detectors we provide a summary table, collecting relevant information, from which similar studies can be fulfilled readily.