Sensitivity of future hadron colliders to leptoquark pair production in the di-muon di-jets channel

Allanach, B. C.; Corbett, Tyler; Madigan, Maeve

doi:10.1140/epjc/s10052-020-7722-3

Cited by 42 publications

(33 citation statements)

References 66 publications

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“…Leptoquarks are colored just like quarks. Therefore, they are copiously produced in pairs in proton-proton collisions at the LHC by strong force [19][20][21][22][23][24][25]. A representative Feynman diagram is shown in figure 1 (a).…”

Section: Introductionmentioning

confidence: 99%

Lepton-quark fusion at Hadron colliders, precisely

Greljo

Selimovic

2021

J. High Energ. Phys.

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When a TeV-scale leptoquark has a sizeable Yukawa coupling, its dominant production mechanism at hadron colliders is the partonic-level lepton-quark fusion. Even though the parton distribution functions for leptons inside the proton are minuscule, they get compensated by the resonant enhancement. We present the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the Large Hadron Collider (LHC). Next-to-leading (NLO) QCD and QED corrections are similar in size but come with the opposite sign. We compute NLO K-factors for a wide range of scalar leptoquark masses, as well as, all possible combinations of quark and lepton flavors and leptoquark charges. Theoretical uncertainties due to the renormalisation and factorisation scale variations and the limited knowledge of parton distribution functions are quantified. We finally discuss how to disentangle the flavor structure of leptoquark interactions by exploiting the interplay between different production channels.

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Section: Introductionmentioning

confidence: 99%

Lepton-quark fusion at Hadron colliders, precisely

Greljo

Selimovic

2021

J. High Energ. Phys.

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“…This is not a generic pattern and can be understood from Eqs. (37) and (38) by varying a few of the free parameters. For example, for a relatively large value of LQ mass (M S 1 ≥ 2 TeV), one may obtain Γ ϕ→gg ≤ Γ ϕ→qq when ϕ is not large, i.e., M ϕ ≤ 250 GeV.…”

Section: B Branching Ratios and Cross Sectionsmentioning

confidence: 99%

“…An S 1 -Higgs coupling can help to stabilize the electroweak vacuum [28]. The collider phenomenology of various LQs has also been extensively discussed in the literature [7,[29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Enhancing scalar productions with leptoquarks at the LHC

Bhaskar

Das

et al. 2020

Phys. Rev. D

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The Standard Model (SM), when extended with a leptoquark (LQ) and right-handed neutrinos, can have interesting new implications for Higgs physics. We show that sterile neutrinos can induce a boost to the down-type quark Yukawa interactions through a diagonal coupling associated with the quarks and a scalar LQ of electromagnetic charge 1=3. The relative change is moderately larger in the case of the first two generations of quarks, as they have vanishingly small Yukawa couplings in the SM. The enhancement in the couplings would also lead to a non-negligible contribution from the quark fusion process to the production of the 125 GeV Higgs scalar in the SM, though the gluon fusion always dominates. However, this may not be true for a general scalar. As an example, we consider a scenario with a SM-gauge-singlet scalar ϕ where an Oð1Þ coupling between ϕ and the LQ is allowed. The ϕqq Yukawa couplings can be generated radiatively only through a loop of LQ and sterile neutrinos. Here, the quark fusion process can have a significant cross section, especially for a light ϕ. It can even supersede the normally dominant gluon fusion process for a moderate to large value of the LQ mass. This model can be tested/constrained at the high luminosity run of the LHC through a potentially large branching fraction of the scalar to two jets.

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“…This strong motivation for LQs makes it also interesting to search for their signatures in other observables. Complementary to direct LHC searches [108][109][110][111][112][113][114][115][116][117][118][119][120][121], oblique electroweak (EW) parameters (S and T parameters [122,123]) and the corrections to (effective on-shell) couplings of the SM Higgs to photons (hγγ), Z and photon (hZγ) and gluons (hgg) allow to test LQ interactions with the Higgs, independently of the LQ couplings to fermions. In this context, LQs were briefly discussed in ref.…”

Section: Introductionmentioning

confidence: 99%

Leptoquarks in oblique corrections and Higgs signal strength: status and prospects

Crivellin

Müller

Saturnino

2020

J. High Energ. Phys.

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Leptoquarks (LQs) are predicted within Grand Unified Theories and are well motivated by the current flavor anomalies. In this article we investigate the impact of scalar LQs on Higgs decays and oblique corrections as complementary observables in the search for them. Taking into account all five LQ representations under the Standard Model gauge group and including the most general mixing among them, we calculate the effects in h → γγ, h → gg, h → Zγ and the Peskin-Takeuchi parameters S, T and U. We find that these observables depend on the same Lagrangian parameters, leading to interesting correlations among them. While the current experimental bounds only yield weak constraints on the model, these correlations can be used to distinguish different LQ representations at future colliders (ILC, CLIC, FCC-ee and FCC-hh), whose discovery potential we are going to discuss.

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Sensitivity of future hadron colliders to leptoquark pair production in the di-muon di-jets channel

Cited by 42 publications

References 66 publications

Lepton-quark fusion at Hadron colliders, precisely

Lepton-quark fusion at Hadron colliders, precisely

Enhancing scalar productions with leptoquarks at the LHC

Leptoquarks in oblique corrections and Higgs signal strength: status and prospects

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