Heavy vector-like quark with charge 5/3 at the LHC

Cacciapaglia, Giacomo; Deandrea, Aldo; Panizzi, Luca; Perriés, S.; Sordini, V.

doi:10.1007/jhep03(2013)004

Cited by 27 publications

(23 citation statements)

References 55 publications

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“…As discussed throughout this review, these states are also predicted in the warped extra-dimensional models or pure 4D descriptions [233][234][235][236][237][238] as they are responsible for taming the radiative contributions to the Higgs potential from the top quark. Recent analyses of 4D effective Lagrangian descriptions parametrizing the most general possible interactions of the top partners can be found in [239][240][241][242].…”

Section: Direct Searchesmentioning

confidence: 99%

Composite Higgses

2014

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For the closing article in this volume on supersymmetry, we consider the alternative options to SUSY theories: we present an overview of composite Higgs models in light of the discovery of the Higgs boson. The small value of the physical Higgs mass suggests that the Higgs quartic is likely loop generated; thus models with tree-level quartics will generically be more tuned. We classify the various models (including bona fide composite Higgs, little Higgs, holographic composite Higgs, twin Higgs and dilatonic Higgs) based on their predictions for the Higgs potential, review the basic ingredients of each of them, and quantify the amount of tuning needed, which is not negligible in any model. We explain the main ideas for generating flavor structure and the main mechanisms for protecting against large flavor violating effects, and we present a summary of the various coset models that can result in realistic pseudo-Goldstone Higgses. We review the current experimental status of such models by discussing the electroweak precision, flavor, and direct search bounds, and we comment on the UV completions of such models and on ways to incorporate dark matter.

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Section: Direct Searchesmentioning

confidence: 99%

Composite Higgses

2014

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“…Therefore, the only allowed representations for the XQs are singlets, doublets or triplets [20][21][22]. Couplings to all generations of SM quarks are allowed.…”

Section: Assumptions On the Xqsmentioning

confidence: 99%

“…In addition, bounds on XQs masses are set assuming the existence of only one new quark besides the SM states and obtained for different values of their branching ratios (BRs). Considering a simple extension of the SM with a single vector-like quark representation besides the SM states, the allowed physical states are limited, so that vector-like quarks can only appear with four different charges: two standard partners of SM quarks t ′ and b ′ (with electric charges +2/3 and −1/3, respectively) and two exotic quarks X with charge +5/3 and Y with charge −4/3, respectively (see, e.g., [20][21][22]). It is possible to build scenarios with more exotic vector-like quarks, but they will not interact directly with SM quarks due to the large charge gap.…”

Section: Introductionmentioning

confidence: 99%

XQCAT: eXtra Quark Combined Analysis Tool

Barducci

Belyaev

Buchkremer

et al. 2015

Computer Physics Communications

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XQCAT (eXtra Quark Combined Analysis Tool) is a tool aimed at determining exclusion confidence levels for scenarios of new physics characterised by the presence of one or multiple heavy extra quarks which interact through Yukawa couplings with any of the Standard Model quarks. The code uses a database of efficiencies for pre-simulated processes of QCD-induced pair production of extra quarks and their subsequent on-shell decays. In the version 1.2 of XQCAT the efficiencies have been computed for a set of seven publicly available search results by the CMS experiment. The input for the code is a text file in which masses, branching ratios and dominant chirality of the couplings of the new quarks are provided. The output of the code is the exclusion confidence levels of the test point for each implemented experimental analysis considered individually and, when possible, in statistical combination. the Standard Model (SM) with only one XQ representation which couples only to the third generation SM quarks or only to the SM light quark families. In contrast, various theoretically-motivated scenarios of new physics predict a new quark sector, i.e. more than one new quark, with general couplings to SM quarks. Notable examples are composite Higgs models or universal extra-dimensions. Hence, recasting experimental limits for these scenarios can be a challenging task. To avoid time-consuming simulations and dedicated searches for scenarios which can already be excluded by current data, we present a tool for reinterpretation of existing experimental analyses, including those not made for XQs searches, in terms of exclusion confidence levels (eCLs) for XQ models. Our tool should serve as a useful preliminary approach to understand in a quick way the regions of validity of scenarios of new physics. Solution method: The core of the tool consists in a database of pre-simulated efficiencies (ǫ), defined as the ratio of signal events which survive a given set of experimental cuts over the total number of signal events. These efficiencies have been computed simulating the process of pair production and decay of XQs with masses in the range 400-2000 GeV and implementing the selection and kinematics cuts of a set of experimental searches at 7 and 8 TeV. The tool uses the database to reconstruct any scenario where XQs couple to SM quarks through Yukawa interactions and gives as output the eCL of the test point, characterised by values of the XQ masses and their branching ratios (BRs) into specific final Keywords Preprint submitted to Computer Physics CommunicationsSeptember 18, 2015 states, for all the implemented searches. It also provides eCLs for combinations of experimental searches when search bins are uncorrelated. The method has been validated against experimental analyses. Restrictions:The efficiency database has been built under the following hypotheses: QCD-induced pair production of quarks with masses from 400 GeV to 2000 GeV with steps of 100 GeV; the electro-weak ( [7]. The code also relies on the possibility ...

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“…Refs. [34][35][36][37][38][39][40][41][42] study the LHC signatures of b ′ , t ′ and χ vectorlike quarks. Ref.…”

Section: Jhep08(2014)079mentioning

confidence: 99%

“…Ref. [37] considers pair production of charge 5/3 vectorlike quarks and shows that with the search for same sign dilepton the discovery reach of the 7 TeV LHC is about 700 GeV with 5 fb −1 integrated luminosity. The LHC signatures of t ′ vectorlike quarks have been discussed in [38] using pp → t ′t′ → bW +b W − channel with the semileptonic decay of the W 's and the reach is found to be about 1 TeV with 100 fb −1 integrated luminosity at the 14 TeV LHC.…”

Section: Jhep08(2014)079mentioning

confidence: 99%

LHC signatures of warped-space vectorlike quarks

Gopalakrishna

Mandal

Mitra

et al. 2014

J. High Energ. Phys.

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Abstract:We study the LHC signatures of TeV scale vectorlike quarks b ′ , t ′ and χ with electromagnetic charges −1/3, 2/3 and 5/3 that appear in many beyond the standard model (BSM) extensions. We consider warped extra-dimensional models and analyze the phenomenology of such vectorlike quarks that are the custodial partners of third generation quarks. In addition to the usually studied pair-production channels which depend on the strong coupling, we put equal emphasis on single production channels that depend on electroweak couplings and on electroweak symmetry breaking induced mixing effects between the heavy vectorlike quarks and standard model quarks. We identify new promising gg-initiated pair and single production channels and find the luminosity required for discovering these states at the LHC. For these channels, we propose a cut that allows one to extract the relevant electroweak couplings. Although the motivation is from warped models, we present many of our results model-independently.

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Heavy vector-like quark with charge 5/3 at the LHC

Cited by 27 publications

References 55 publications

Composite Higgses

Composite Higgses

XQCAT: eXtra Quark Combined Analysis Tool

LHC signatures of warped-space vectorlike quarks

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