Anarchy with linear and bilinear interactions

Rold, Leandro Da

doi:10.1007/jhep10(2017)120

Cited by 12 publications

(12 citation statements)

References 43 publications

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“…We will assume this to be the case, and we will not elaborate more on the neutrino masses, see refs. [39,40,43] for some examples.…”

Section: Partial Compositeness and Flavor Structurementioning

confidence: 99%

“…In the lepton sector the electron dipole moment and the flavor violating decay µ → eγ give even stronger bounds: f O(20-40) TeV. There have been a few proposals for these problems, as the presence different scales for different flavors [59], the presence of naturally tiny bilinear interactions in anarchic scenarios [40], the existence of extended color symmetries in the SCFT [60,61], as well as the presence of flavor symmetries [62,63]. The proposal of ref.…”

Section: Jhep12(2019)112mentioning

confidence: 99%

“…The proposal of ref. [40], where the lepton doublet and singlet of the first generation are elementary, as well as the first generation Right-handed up-and downquarks, can be implemented straightforward in the present model. In this case, the most dangerous contributions to the aformentioned processes are suppressed, though transitions from operators like (…”

Section: Jhep12(2019)112mentioning

confidence: 99%

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A vector leptoquark for the B-physics anomalies from a composite GUT

Rold

Lamagna

2019

J. High Energ. Phys.

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A vector leptoquark at the TeV scale, mostly coupled to the fermions of the third generation, is the preferred option to explain the hints of lepton flavor universality violation in the decays of B-mesons. It seems interesting to assume that this leptoquark belongs to the same beyond the Standard Model sector that solves the hierarchy problem, since the third generation of fermions play the leading role in the instability of the Higgs potential. We present a composite Grand Unified Theory with resonances at the TeV that contains the required vector leptoquark and develops the Higgs as a pseudo Nambu-Goldstone boson. We show that anarchic partial compositeness of the Standard Model fermions can accommodate the couplings of Left-handed currents required by the B-anomalies, predicting very small couplings to the Right-handed currents without any additional hypothesis. By making use of an effective theory description of the strong dynamics, in terms of weakly coupled resonances, we are able to compute the corrections to B-physics, as well as the one-loop potential for the pseudo Nambu-Goldstone bosons. The theory has a rich phenomenology and a candidate for dark matter.

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“…We will assume this to be the case, and we will not elaborate more on the neutrino masses, see refs. [39,40,43] for some examples.…”

Section: Partial Compositeness and Flavor Structurementioning

confidence: 99%

Section: Jhep12(2019)112mentioning

confidence: 99%

Section: Jhep12(2019)112mentioning

confidence: 99%

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A vector leptoquark for the B-physics anomalies from a composite GUT

Rold

Lamagna

2019

J. High Energ. Phys.

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“…Flavor and CP symmetries can alleviate these issues [5][6][7], but they are in tension with LHC tests of compositeness of the light quarks [8]. More promising is the proposal of dynamical flavor scales [1], as well as the addition of tiny bilinear interactions [9].…”

Section: Introductionmentioning

confidence: 99%

A composite Froggatt-Nielsen model of flavor

Da Rold,

Lamagna

2021

Preprint

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A natural composite Higgs demands the presence of light resonances at the TeV scale, that in general are in conflict with bounds from flavor and CP violation. We propose a composite model with a Froggatt-Nielsen mechanism, that offers new possibilities for the origin of flavor. We analyse the interplay of partial compositeness and the horizontal U(1) symmetry in achieving the quark masses and mixing angles. We study the contributions to ∆F = 2 4-fermion operators, as well as to ∆F = 1 and neutron dipole operators. We find scenarios in which the contribution to Left-Right and Righthanded operators involving the first and second generations can be suppressed, in particular for a region of parameter space it is possible to simultaneously suppress C sd 4 by λ C and the dipole moments by λ 2 C compared with anarchic partial compositeness, possibly making the resonances accessible at LHC. 4-fermion operators of B s -meson mixing and Left-handed operators are not suppressed.

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“…The scenario of APC also provides a very economic mechanism to satisfy most of the flavor bounds present in Composite Higgs Models[22,25]. 33 The most important constraints arise from the kaon system and electromagnetic dipole moments, although some solutions have been proposed[26][27][28].…”

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confidence: 99%

A composite pNGB leptoquark at the LHC

Álvarez

Rold

Juste

et al. 2018

J. High Energ. Phys.

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The measurements of R ( * ) K and R ( * ) D by BaBar, Belle and the LHCb collaborations could be showing a hint of lepton flavor universality violation that can be accommodated by the presence of suitable leptoquarks at the TeV scale. We consider an effective description, with leptoquarks arising as composite pseudo Nambu-Goldstone bosons, as well as anarchic partial compositeness of the SM fermions. Considering the R ( * ) K anomaly within this framework, we study pair production of S 3 ∼ (3, 3) 1/3 at the LHC. We focus on the component S 1/3 3 of the triplet, which decays predominantly into tτ and bν, and study the bounds from existing searches at √ s = 13 TeV at the LHC. We find that sbottom searches in the bb + E miss T final state best explore the region in parameter space preferred by our model and currently exclude S 1/3 3 masses up to ∼1 TeV. Additional searches, considering the tτ and tµ decay modes, are required to probe the full physical parameter space. In this paper we also recast existing studies on direct leptoquark searches in the tτ tτ channel and SM tttt searches, and obtain the regions in parameter space currently excluded. Practically the whole physical parameter space is currently excluded for masses up to ∼0.8 TeV, which could be extended up to ∼1 TeV with the full Run 3 dataset. We conclude that pair production searches for this leptoquark can benefit from considering the final state tτ b + E miss T , where the largest branching ratio is expected. We appraise that future explorations of leptoquarks explaining the B-anomalies with masses beyond the TeV should also consider single and non-resonant production in order to extend the mass reach.Since the birth of the Standard Model (SM), Lepton Flavor Universality (LFU) has been an outstanding feature of particle physics. It is one of the milestones in Fermi's Universal Theory, which is captured by the gauge interactions of the SM, and only broken within the SM in the Yukawa interactions. Since the establishment of the SM, there has been much interest in searching for LFU violation. However, only in recent years it has become possible to explore interactions that involve heavy quarks and heavy leptons, i.e. the two sectors characterized by a large flavor universality violation in their Yukawa interactions, and thus where one could expect to find new sources of flavor universality violation.Over the last few years, results from B-factories and the LHCb experiment show deviations of ∼2-3σ in the ratios R ( * ) -4], where accurate tests of LFU can be performed. This has been a subject of intense study in the literature where, mostly within an Effective Field Theory (EFT) approach, one can identify several possible New Physics (NP) explanations [5-10] for the discrepancies. Among them, a leptoquark [11] arises as one of the favored explanations [6,12,13]. In particular, considering the R ( * ) K anomaly, there are three possible leptoquarks that can accommodate the observed results [6]:where S and V denote spin 0 and 1, respectively, and the numbers...

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Anarchy with linear and bilinear interactions

Cited by 12 publications

References 43 publications

A vector leptoquark for the B-physics anomalies from a composite GUT

A vector leptoquark for the B-physics anomalies from a composite GUT

A composite Froggatt-Nielsen model of flavor

A composite pNGB leptoquark at the LHC

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