Vector leptoquarks beyond tree level

Fuentes-Martín, Javier; Isidori, Gino; König, Matthias; Selimovic, Nudzeim

doi:10.1103/physrevd.101.035024

Cited by 62 publications

(70 citation statements)

References 55 publications

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“…table 2). 7 Bounds from direct searches have been extensively studied in the literature, see [29,44,45,47,51,[60][61][62][63][64]. It is straightforward to verify that the ranges in eqs.…”

Section: Parameter Rangesmentioning

confidence: 98%

The dark side of 4321

Guadagnoli

Reboud

Stangl

2020

J. High Energ. Phys.

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The evidence of Dark Matter (DM) is one of the strongest observational arguments in favor of physics beyond the Standard Model. Despite expectations, a similar evidence has been lacking so far in collider searches, with the possible exception of B-physics discrepancies, a coherent set of persistent deviations in a homogeneous dataset consisting of b → c and b → s semi-leptonic transitions. We explore the question whether DM and the B discrepancies may have a common origin. We do so in the context of the so-called 4321 gauge model, a UV-complete and calculable setup that yields a U1 leptoquark, the by far most successful single mediator able to explain the B anomalies, along with other new gauge bosons, including a Z′. Adding to this setup a ‘minimal’ DM fermionic multiplet, consisting of a 4 under the 4321’s SU(4), we find the resulting model in natural agreement with the relic-density observation and with the most severe direct-detection bounds, in the sense that the parameter space selected by B physics is also the one favored by DM phenomenology. The DM candidate is a particle with a mass in the WIMP range, freeze-out dynamics includes a co-annihilator (the ‘rest’ of the 4 multiplet), and the most important gauge mediator in the DM sector is the Z′.

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“…table 2). 7 Bounds from direct searches have been extensively studied in the literature, see [29,44,45,47,51,[60][61][62][63][64]. It is straightforward to verify that the ranges in eqs.…”

Section: Parameter Rangesmentioning

confidence: 98%

The dark side of 4321

Guadagnoli

Reboud

Stangl

2020

J. High Energ. Phys.

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“…To investigate the interplay between precision measurements and collider searches in this interesting class of models, it is important to explore the relation between low-and high-energy observables beyond the tree level. In a previous paper [26], we have evaluated the next-to-leading-order (NLO) corrections in the perturbative expansion in the LQ coupling, α 4 ¼ g 2 4 =ð4πÞ, to the matching conditions of semileptonic operators at the high scale. These corrections are sizable, but still within a perturbative regime even for g 4 ≈ 3 (a reference value motivated by the B-physics anomalies; see, e.g., [20]).…”

Section: Introductionmentioning

confidence: 99%

“…These corrections are sizable, but still within a perturbative regime even for g 4 ≈ 3 (a reference value motivated by the B-physics anomalies; see, e.g., [20]). The main effect is an enhanced LQ contribution at low energy, at fixed on-shell coupling, that for g 4 ¼ 3 ranges from 15% to 40%, depending on the operator [26].…”

Section: Introductionmentioning

confidence: 99%

“…Our scope here is to analyze two subleading contributions that were not included in [26]: Oðα s Þ corrections and the contributions from radial modes. Naively, both effects are expected to be well below that of the leading Oðα 4 Þ corrections analyzed in [26] (for the phenomenologically motivated large values of the g 4 coupling), but a precise assessment of their size is important.…”

Section: Introductionmentioning

confidence: 99%

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Vector leptoquarks beyond tree level. II. O(αs) corrections and radial modes

et al. 2020

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We clarify open issues in relating low-and high-energy observables, at next-to-leading order accuracy, in models with a massive leptoquark embedded in a flavor nonuniversal SUð4Þ × SUð3Þ × SUð2Þ × Uð1Þ gauge group. Extending previous work on this subject, we present a complete analysis of the Oðα s Þ corrections to the matching conditions of semileptonic operators at the high scale. These corrections are not negligible, but they do not exceed the 10% level and are subleading compared to the Oðα 4 Þ corrections proportional to the leading leptoquark coupling, which is expected to be much larger than the QCD coupling in the parameter space region of phenomenological interest. We further analyze the impact of radial modes, both at Oðα 4 Þ and at Oðα s Þ accuracies, highlighting their role in the renormalization of the theory.

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“…Some of these models can explain the observed discrepancy in muon g − 2 [18,19] and also accommodate the excess of 2.4σ in a Higgs decay branching fraction to μτ at 8 TeV with 19.7 fb −1 luminosity [20]. Because of their great importance in elucidating several issues of flavor physics , leptoquarks have been studied in the literature in gory details in the last few decades [7][8][9][10][11][12][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69]. In parallel, numerous searches for leptoquarks have been performed in different colliders [70][71][72][73][74][75][76][77][78][79][80][81][82][83].…”

Section: Introductionmentioning

confidence: 99%

Investigating the production of leptoquarks by means of zeros of amplitude at photon electron collider

2020

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Leptoquarks belong to the possible candidates for explaining various anomalies in flavor physics. Nonetheless, their existence is yet to be confirmed on the experimental side. In this paper we show how zeros of the single-photon tree-level amplitude can be used to extract information as regards leptoquarks in the case of e-γ colliders. A small number of standard model backgrounds keep the signal clean in this kind of colliders. Unlike other colliders, the zeros of the single-photon amplitude here depend on √ s and on the mass of leptoquark along with its electric charge. We perform a PYTHIA based simulation for reconstructing the leptoquark from its decay products of the first generation and estimating the background with luminosity of 100 fb −1. Our analysis is done for all the leptoquarks that can be seen at an e-γ collider with three different masses (70 GeV, 650 GeV and 1 TeV) and three different center of momentum energies (200 GeV, 2 TeV and 3 TeV). The effects of non-monochromatic photons on the zeros of the amplitude under laser backscattering and the equivalent photon approximation have also been addressed.

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Vector leptoquarks beyond tree level

Cited by 62 publications

References 55 publications

The dark side of 4321

The dark side of 4321

Vector leptoquarks beyond tree level. II. O(αs) corrections and radial modes

Investigating the production of leptoquarks by means of zeros of amplitude at photon electron collider

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