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13 papers found.
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Relaxion and light (pseudo)scalars at the HL-LHC and lepton colliders

Abstract We study the potential of future lepton colliders, running at the Z-pole and above, and the High-Luminosity LHC to search for the relaxion and other light scalars ϕ. We investigate the interplay of direct searches and precision observables for both \( \mathcal{C}\mathcal{P} \)-even and -odd couplings. In particular, precision measurements of exotic Z-decays, Higgs...

Large Higgs-electron Yukawa coupling in 2HDM

Abstract The present upper bound on κ e , the ratio between the electron Yukawa coupling and its Standard Model value, is of \( \mathcal{O}(600) \). We ask what would be the implications in case that κ e is close to this upper bound. The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation. In this...

Testing minimal flavor violation in leptoquark models of the \( {R_K}_{{}^{\left(\ast \right)}} \) anomaly

The \( {R_K}_{{}^{\left(\ast \right)}} \) anomaly can be explained by tree level exchange of leptoquarks. We study the consequences of subjecting these models to the principle of minimal flavor violation (MFV). We consider MFV in the linear regime, and take the charged lepton Yukawa matrix to be the only spurion that violates lepton flavor universality. We find that a combination...

Phenomenology of relaxion-Higgs mixing

We show that the relaxion generically stops its rolling at a point that breaks CP leading to relaxion-Higgs mixing. This opens the door to a variety of observational probes since the possible relaxion mass spans a broad range from sub-eV to the GeV scale. We derive constraints from current experiments (fifth force, astrophysical and cosmological probes, beam dump, flavour, LEP...

Exotic colored scalars at the LHC

Efrati, Claudia Frugiuele and Yosef Nir charge jQj = 2=3; 4=3; 5=3; 7=3; 8=3 and 10=3. If X is an SU(2)W -non-singlet, mass splitting within the multiplet allows for cascade decays of the members into the

Dark matter beams at LBNF

High-intensity neutrino beam facilities may produce a beam of light dark matter when protons strike the target. Searches for such a dark matter beam using its scattering in a nearby detector must overcome the large neutrino background. We characterize the spatial and energy distributions of the dark matter and neutrino beams, focusing on their differences to enhance the...

GeV-scale dark matter: production at the Main Injector

Claudia Frugiuele mediator, we study dark matter production in fixed target collisions. The ensuing signal in a neutrino near detector consists of neutral-current events with an energy distribution peaked

Fermion hierarchy from sfermion anarchy

We present a framework to generate the hierarchical flavor structure of Standard Model quarks and leptons from loops of superpartners. The simplest model consists of the minimal supersymmetric standard model with tree level Yukawa couplings for the third generation only and anarchic squark and slepton mass matrices. Agreement with constraints from low energy flavor observables...

Dirac gauginos, R symmetry and the 125 GeV Higgs

Abstract We study a supersymmetric scenario with a quasi exact R-symmetry in light of the discovery of a Higgs resonance with a mass of 125 GeV. In such a framework, the additional adjoint superfields, needed to give Dirac masses to the gauginos, contribute both to the Higgs mass and to electroweak precision observables. We analyze the interplay between the two aspects, finding...

Mixing stops at the LHC

Prateek Agrawal Claudia Frugiuele Fermilab P.O. Box Batavia IL U.S.A. We study the phenomenology of a light stop NLSP in the presence of large mixing with either the first or the second generation

“L = R” - U(1) R lepton number at the LHC

We perform a detailed study of a variety of LHC signals in supersymmetric models where lepton number is promoted to an (approximate) U(1) R symmetry. Such a symmetry has interesting implications for naturalness, as well as flavor- and CP-violation, among others. Interestingly, it makes large sneutrino vacuum expectation values phenomenologically viable, so that a slepton doublet...

Fitting neutrino physics with a U(1) R lepton number

Enrico Bertuzzo 2 Claudia Frugiuele 1 0 , CEA-Saclay, F-91191 Gif-sur-Yvette Cedex, France 1 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University , 1125 Colonel By Drive

“L = R” — U(1) R as the origin of leptonic ‘RPV’

A classification of phenomenologically interesting supersymmetric extensions of the Standard-Model with a U(1) R symmetry is presented. Some of these are consistent with subsets of leptonic or baryonic “R-parity violating” (RPV) operators, thereby providing a natural motivation for them. We then focus on a particular class of models in which the U(1) R symmetry coincides with...