Shedding light on top partner at the LHC

Alhazmi, Haider; Kim, Jeong Han; Kong, Kyoungchul; Lewis, Ian M.

doi:10.1007/jhep01(2019)139

Cited by 30 publications

(21 citation statements)

References 75 publications

(142 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, only limits in a narrow range 100 GeV m κ 400 GeV have been obtained using LHC results for κ → bb [63]; see refs. [64][65][66][67][68][69][70][71][72][73] for studies of other exotic decays of VLQs. Thus, we will provide dedicated searches for this case.…”

Section: Jhep07(2020)128mentioning

confidence: 99%

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

Ramos

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

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.

show abstract

Section: Jhep07(2020)128mentioning

confidence: 99%

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

Ramos

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…For related studies and especially for studies of decay modes and signatures in scenarios with different quantum numbers of vectorlike matter see also refs. [42][43][44][45][46][47][48][49][50][51][52] and references therein.…”

Section: Jhep04(2019)019mentioning

confidence: 99%

Hunting for vectorlike quarks

Dermíšek

Lunghi

Shin

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

We analyze decays of vectorlike quarks in extensions of the standard model and a two Higgs doublet model. We identify several typical patterns of branching ratios of the lightest new up-type quark, t 4 , and down-type quark, b 4 , depending on the structure of Yukawa couplings that mix the vectorlike and standard model quarks (we assume only mixing with the third generation) and also on their doublet or singlet nature. We find that decays into heavy neutral or charged Higgs bosons, when kinematically open, can easily dominate and even be close to 100%: b 4 → Hb at medium to large tan β, t 4 → Ht at small tan β and b 4 → H ± t, t 4 → H ± b at both large and small tan β. The pair production of vectorlike quarks leads to 6t, 4t2b, 2t4b and 6b final states. The decay modes into W , Z and h follow the pattern expected from the Goldstone boson equivalence limit that we generalize to scenarios with all possible couplings. We also discuss in detail the structure of Yukawa couplings required to significantly deviate from the pattern characteristic of the Goldstone boson equivalence limit that can result in essentially arbitrary branching ratios.

show abstract

“…• Kinetic Mixing: As can be seen in covariant derivative in Eq. (17), the couplings between the Z and SM particles are shifted due to the kinetic mixing of the Hypercharge and U (1) d gauge boson. Hence, electroweak precision data can place bounds on the value of the kinetic mixing parameter ε [31,53].…”

Section: A Electroweak Precision and Direct Searchesmentioning

confidence: 99%

“…Traditionally, searches for VLQs rely on decays into the Standard Model (SM) electroweak (EW) bosons: W/Z/Higgs. However, there is a a class of "maverick top partners" with non-traditional decays into photons [16][17][18][19][20][21], gluons [16][17][18][19][20][21], new scalars [22][23][24][25], etc. These new decays can easily be dominant with minor tweaks to the simplest VLQ models.…”

mentioning

confidence: 99%

Searching for dark photons with maverick top partners

et al. 2020

Self Cite

View full text Add to dashboard Cite

In this paper, we present a model in which an up-type vector-like quark (VLQ) is charged under a new U (1) d gauge force which kinetically mixes with the SM hypercharge. The gauge boson of the U (1) d is the dark photon, γ d . Traditional searches for VLQs rely on decays into Standard Model electroweak bosons W, Z or Higgs. However, since no evidence for VLQs has been found at the Large Hadron Collider (LHC), it is imperative to search for other novel signatures of VLQs beyond their traditional decays. As we will show, if the dark photon is much less massive than the Standard Model electroweak sector, M γ d M Z , for the large majority of the allowed parameter space the VLQ predominately decays into the dark photon and the dark Higgs that breaks the U (1) d . That is, this VLQ is a "maverick top partner" with nontraditional decays.One of the appeals of this scenario is that pair production of the VLQ at the LHC occurs through the strong force and the rate is determined by the gauge structure. Hence, the production of the dark photon at the LHC only depends on the strong force and is largely independent of the small kinetic mixing with hypercharge. This scenario provides a robust framework to search for a light dark sector via searches for heavy colored particles at the LHC.Some of the most important searches for Beyond the Standard Model (BSM) physics at the Large Hadron Collider (LHC) are searches for new vector like quarks (VLQs). Up-type VLQs, so-called top partners T , are ubiquitous in composite [1][2][3][4][5][6][7] and Little Higgs [8][9][10][11][12][13][14][15] models where new fermionic top partners help solve the hierarchy problem. Traditionally, searches for VLQs rely on decays into the Standard Model (SM) electroweak (EW) bosons: W/Z/Higgs. However, there is a a class of "maverick top partners" with non-traditional decays into photons [16][17][18][19][20][21], gluons [16][17][18][19][20][21], new scalars [22][23][24][25], etc. These new decays can easily be dominant with minor tweaks to the simplest VLQ models. We consider a VLQ that is charged under both the SM and a new abelian gauge symmetry U (1) d , where the SM is neutral under the U (1) d . As we will show, for a very large range of parameter space, this opens new dominant decays of VLQs that have not yet been searched for.This new U (1) d can be motivated by noting that dark matter may very well have selfinteractions through this new force. The U (1) d gauge boson, the so-called dark photon, kinetically mixes with the SM hypercharge through a renormalizable interaction [26][27][28]. This kinetic mixing can be generated via new vector like fermions charged under both the SM and the new U (1) d [26,29,30], as considered here. In the limit that the dark photon is much less massive than the Z and the kinetic mixing is small, the dark photon inherits couplings to SM particles of the form ε J µ EM , where J µ EM is the electromagnetic current and ε is the kinetic mixing parameter. Hence, the name dark photon. Most of the searches for the dark photon...

show abstract

Shedding light on top partner at the LHC

Cited by 30 publications

References 75 publications

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

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

Hunting for vectorlike quarks

Searching for dark photons with maverick top partners

Contact Info

Product

Resources

About