Bounding wide composite vector resonances at the LHC

Barducci, D.; Delaunay, Cédric

doi:10.1007/jhep02(2016)055

Cited by 19 publications

(16 citation statements)

References 59 publications

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“…Besides introducing kinematics different from QCD T 0 T 0 -pair production, the presence of the Z 0 can also provide an additional, potentially even dominant contribution to the pair production rate of top partners without conflicting with existing bounds from Z 0 searches in di-jet and di-lepton final states. A similar observation has been made before in the context of pair production enhancement of charge 5=3 top partners through SUð2Þ triplet vector resonances [26]. As we will show, the Z 0 , T 0 and DM masses can be probed with the tt þ = E T signature well beyond the reach coming only from QCD production.…”

Section: Introductionsupporting

confidence: 50%

LHC dark matter signals from vector resonances and top partners

et al. 2018

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Extensions of the standard model which address the hierarchy problem and dark matter (DM) often contain top partners and additional resonances at the TeV scale. We explore the phenomenology of a simplified effective model with a vector resonance Z 0 , a fermionic vectorlike colored partner of the top quark T 0 as well as a scalar DM candidate ϕ and provide publicly available implementations in CalcHEP and MadGraph. We study the pp → Z 0 → T 0 T 0 → ttϕϕ process at the LHC and find that it plays an important role in addition to the T 0 T 0 production via strong interactions. It turns out that the presence of the Z 0 can provide a dominant contribution to the tt þ = E T signature without conflicting with existing bounds from Z 0 searches in di-jet and di-lepton final states. We find that, through this process, the LHC is already probing DM masses up to about 900 GeV and top partner masses up to about 1.5 TeV, thus exceeding the current bounds from QCD production alone almost by a factor of 2 for both particles.

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Section: Introductionsupporting

confidence: 50%

LHC dark matter signals from vector resonances and top partners

et al. 2018

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“…Other existing studies in this channel (e.g. [8]) rely on decay via lighter top partners. Bose symmetry forbids a coupling between ρ and the longitudinal polarizations of the SM gauge bosons (one cannot obtain a spin-1, isospin-singlet state from two identical isospin triplets).…”

Section: Massive Singlet Vector Bosonmentioning

confidence: 99%

Probing top-antitop resonances with t t ¯ $$ t\overline{t} $$ scattering at LHC14

Liu

Mahbubani

2016

J. High Energ. Phys.

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We explore the sensitivity of the LHC at 14 TeV centre-of-mass energy (LHC14) to the single production and decay of top-antitop resonances in the four-top final state. We focus on the same-sign dilepton channel, and work within a simplified model with a vector boson coupling to the Standard Model only via its interactions with right-handed top quarks. We find it is possible to discover (exclude) such a vector boson with 300 fb −1 of integrated luminosity up to a mass of 1.2 (1.6) TeV for a modest coupling to tops of g ρ = 2. We present our results as an exclusion limit on the cross-section × branching ratio for ease of recasting, and interpret them in the context of the gauge-singlet vector boson ρ X present in many simple Composite Higgs theories.

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“…The highly boosted regime offers good prospects for accurate reconstruction of the ρ 0 and T f 1 resonance masses, as well as less contamination from SM backgrounds which rapidly fall of with the increase in transverse momenta. Note that searches for resonances in three body decays have so far been overlooked at the LHC, despite much top-down motivation to examine such final states [7,11,15,16].…”

Section: Jhep03(2017)127mentioning

confidence: 99%

“…In CHMs, the most stringent limit arises from the oblique parameter S which yields bounds which are typically around 2 TeV [16,24,45]. Furthermore, direct searches for top partners at the LHC [1, 2] put a lower limit on the top partner masses of ∼ 950 GeV.…”

Section: Jhep03(2017)127mentioning

confidence: 99%

“…Furthermore, refs. [11][12][13][14][15][16] discussed searches for electroweak spin-1 resonances decaying into a pair of top partners as well as into a third generation quark and a top partner, and showed that the current limits on vector resonance masses could be significantly weakened if the resonance decays dominantly to final states other than SM pairs.…”

Section: Jhep03(2017)127mentioning

confidence: 99%

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LHC vector resonance searches in the t t ¯ Z $$ t\overline{t}Z $$ final state

Backović

Flacke

Jain

et al. 2017

J. High Energ. Phys.

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LHC searches for BSM resonances in l + l − , jj, tt, γγ and V V final states have so far not resulted in discovery of new physics. Current results set lower limits on mass scales of new physics resonances well into the O(1) TeV range, assuming that the new resonance decays dominantly to a pair of Standard Model particles. While the SM pair searches are a vital probe of possible new physics, it is important to re-examine the scope of new physics scenarios probed with such final states. Scenarios where new resonances decay dominantly to final states other than SM pairs, even though well theoretically motivated, lie beyond the scope of SM pair searches. In this paper we argue that LHC searches for (vector) resonances beyond two particle final states would be useful complementary probes of new physics scenarios. As an example, we consider a class of composite Higgs models, and identify specific model parameter points where the color singlet, electrically neutral vector resonance ρ 0 decays dominantly not to a pair of SM particles, but to a fermionic top partner T f 1 and a top quark, with T f 1 → tZ. We show that dominant decays of ρ 0 → T f 1 t in the context of Composite Higgs models are possible even when the decay channel to a pair of T f 1 is kinematically open. Our analysis deals with scenarios where both m ρ and m T f 1 are of O(1) TeV, leading to highly boosted ttZ final state topologies. We show that the particular composite Higgs scenario we consider is discoverable at the LHC13 with as little as 30 fb −1 , while being allowed by other existing experimental constraints.

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Bounding wide composite vector resonances at the LHC

Cited by 19 publications

References 59 publications

LHC dark matter signals from vector resonances and top partners

LHC dark matter signals from vector resonances and top partners

Probing top-antitop resonances with t t ¯ $$ t\overline{t} $$ scattering at LHC14

LHC vector resonance searches in the t t ¯ Z $$ t\overline{t}Z $$ final state

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