Unified SU(4) theory for the 
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Balaji, S.; Schmidt, Michael A.

doi:10.1103/physrevd.101.015026

Cited by 39 publications

(32 citation statements)

References 97 publications

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“…For example, they are in the spectrum of low-scale quark-lepton unification models à la Pati-Salam (see e.g. [2][3][4][5][6][7][8][9][10]). TeV-scale leptoquarks also appear as pseudo-Nambu-Goldstone bosons of a new strongly interacting dynamics possibly related to the origin of the electroweak symmetry breaking (see e.g.…”

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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“…However, these missing mass terms can be generated through a modified scalar sector. For example, if χ L ∼ (4, 2, 1) is replaced with χ ∼ (4, 2, 3) then, as was first noted in [16], the missing mass term in the top-right entry of M eE in eq. (4.3), proportional to v L , is generated for the case of an SU(2) R triplet.…”

Section: Bottom-left Dominance: Su(2) L/r Triplet Fermionsmentioning

confidence: 88%

“…Charged-lepton mixing exclusively will occur with the addition of SU(2) L/R triplets or bidoublets and in the down-sector exclusively with the addition of SU(4) sextets. 16 Mixing will occur in both sectors either through a combination of the aforementioned multiplets or (minimally) with 17 the addition of a pair of SU(4) decuplets or with a pair of SU(4)⊗SU(2) L/R bi-fundamental fermions, though only the former can generate a viable SM fermion mas spectrum.…”

Section: Fermion Mixingmentioning

confidence: 99%

“…The use of charged-lepton mixing in order to both break the down-isospin mass degeneracy and reduce the allowed scale of PS breaking has already been considered in the context of the B anomalies for a specific model [15,16]. The aim of this paper is to thoroughly analyse which PS multiplets are viable candidates in breaking the aforementioned mass degeneracy, and to evaluate the requirements on the couplings introduced in each case such that this also leads to lower experimentally allowed PS breaking scales.…”

Section: Introductionmentioning

confidence: 99%

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Lowering the scale of Pati-Salam breaking through seesaw mixing

Dolan

Dutka

Volkas

2021

J. High Energ. Phys.

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We analyse the experimental limits on the breaking scale of Pati-Salam extensions of the Standard Model. These arise from the experimental limits on rare-meson decay processes mediated at tree-level by the vector leptoquark in the model. This leptoquark ordinarily couples to both left- and right-handed SM fermions and therefore the meson decays do not experience a helicity suppression. We find that the current limits vary from $$ \mathcal{O} $$ O (80–2500) TeV depending on the choice of matrix structure appearing in the relevant three-generational charged-current interactions. We extensively analyse scenarios where additional fermionic degrees of freedom are introduced, transforming as complete Pati-Salam multiplets. These can lower the scales of Pati-Salam breaking through mass-mixing within the charged-lepton and down-quark sectors, leading to a helicity suppression of the meson decay widths which constrain Pati-Salam breaking. We find four multiplets with varying degrees of viability for this purpose: an SU(2)L/R bidoublet, a pair of SU(4) decuplets and either an SU(2)L or SU(2)R triplet all of which contain heavy exotic versions of the SM charged leptons. We find that the Pati-Salam limits can be as low as $$ \mathcal{O} $$ O (5–150) TeV with the addition of these four multiplets. We also identify an interesting possible connection between the smallness of the neutrino masses and a helicity suppression of the Pati-Salam limits for three of the four multiplets.

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“…In order to reconcile these discrepancies, many models have been proposed. One such type of models have lepton universality violation at tree level by introducing a Z 0 [18][19][20][21][22] or a leptoquark [23][24][25][26][27][28][29], see e.g., Refs. [30][31][32] for recent reviews and references therein.…”

Section: Introductionmentioning

confidence: 99%

Anomalies in B -meson decays and the muon g−2 from dark loops

2020

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We explore a class of models which can provide a common origin for the recently observed evidence for lepton flavor universality violation in b → sl þ l − decays, the dark matter (DM) problem, and the longstanding muon (g − 2) anomaly. In particular, both anomalies in the B meson decays and the muon (g − 2) can be explained by the additional one-loop diagrams with DM candidates. We first classify several simple models according to the new fields' quantum numbers. We then focus on a specific promising model and perform a detailed study of both DM and flavor physics. A random scan over the relevant parameter space reveals that there is indeed a large parameter space which can explain the three new physics phenomena simultaneously, while satisfying all other flavor and DM constraints. Finally, we discuss some of the possible new physics signatures at the Large Hadron Collider.

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Unified SU(4) theory for the RD(*) and RK
S. Balaji
¹
,
Michael A. Schmidt
²

Cited by 39 publications

References 97 publications

Lepton-quark fusion at Hadron colliders, precisely

Lepton-quark fusion at Hadron colliders, precisely

Lowering the scale of Pati-Salam breaking through seesaw mixing

Anomalies in B -meson decays and the muon g−2 from dark loops

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Unified SU(4) theory for the RD(*) and RKS. Balaji1, Michael A. Schmidt2

Cited by 39 publications

References 97 publications

Lepton-quark fusion at Hadron colliders, precisely

Lepton-quark fusion at Hadron colliders, precisely

Lowering the scale of Pati-Salam breaking through seesaw mixing

Anomalies in B -meson decays and the muon g−2 from dark loops

Contact Info

Product

Resources

About

Unified SU(4) theory for the RD(*) and RK
S. Balaji
¹
,
Michael A. Schmidt
²