Publications (36)
Low Seesaw Scale Solution for and
A. de Giorgi, L. Merlo, S. Pokorski
In this short talk, we present a renormalizable model that can i) generate neutrino masses via a low-scale seesaw mechanism and ii) solve the long-standing and the more…
A New bound on CP Violation in the Lepton Yukawa Coupling and electroweak baryogenesis
J. Alonso-González, L. Merlo, S. Pokorski
The origin of the matter-antimatter asymmetry in the Universe is a fundamental question of physics. Electroweak baryogenesis is a compelling scenario for explaining it but it requi…
The Effective Chiral Lagrangian for a Light Dynamical "Higgs Particle"
R. Alonso, M. B. Gavela, L. Merlo +2
We generalize the basis of CP-even chiral effective operators describing a dynamical Higgs sector, to the case in which the Higgs-like particle is light. Gauge and gauge-Higgs oper…
Same-sign WW Scattering in the HEFT: Discoverability vs. EFT Validity
P. Kozow, L. Merlo, S. Pokorski +1
Vector boson scatterings are fundamental processes to shed light on the nature of the electroweak symmetry breaking mechanism. Deviations from the Standard Model predictions on the…
Revisiting Minimal Lepton Flavour Violation in the Light of Leptonic CP Violation
D. N. Dinh, L. Merlo, S. T. Petcov +1
The Minimal Lepton Flavour Violation (MLFV) framework is discussed after the recent indication for CP violation in the leptonic sector. Among the three distinct versions of MLFV, t…
Sigma Decomposition: The CP-Odd Lagrangian
I. M. Hierro, L. Merlo, and S. Rigolin
In Alonso et al., JHEP 12 (2014) 034, the CP-even sector of the effective chiral Lagrangian for a generic composite Higgs model with a symmetric coset has been constructed, up to f…
The complete HEFT Lagrangian after the LHC Run I
I. Brivio, J. Gonzalez-Fraile, M. C. Gonzalez-Garcia +1
The complete effective chiral Lagrangian for a dynamical Higgs is presented and constrained by means of a global analysis including electroweak precision data together with Higgs a…
Leptonic Dynamical Yukawa Couplings
R. Alonso, M. B. Gavela, D. Hernandez +2
A dynamical origin of the Yukawa couplings is a promising scenario to explain the flavour puzzle. The focus of this letter is set on the role of the neutrino Majorana character: wh…
Neutrino and Charged Lepton Flavour Today
R. Alonso, M. B. Gavela, D. Hernandez +2
Flavour physics is a priceless window on physics beyond the Standard Model. In particular, flavour violation in the lepton sector looks very promising, as high precision measuremen…
The cost of an ALP solution to the neutral -anomalies
J. Bonilla, A. de Giorgi, B. Gavela +2
The neutral anomalies in decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-…
A Bottom-Up Approach: The Data Driven Flavour Model
L. Merlo
A bottom-up approach has been adopted to identify a flavour model that agrees with present experimental measurements. The charged fermion mass hierarchies suggest that only the top…
Data Driven Flavour Model
F. Arias-Aragon, C. Bouthelier-Madre, J. M. Cano +1
A bottom-up approach has been adopted to identify a flavour model that agrees with present experimental measurements. The charged fermion mass hierarchies suggest that only the top…
The Minimal Axion Minimal Linear Model
L. Merlo, F. Pobbe, S. Rigolin
The minimal linear model is extended including an additional complex scalar field, singlet under the global and the Standard Model gauge symmetries. The…
On The Potential of Minimal Flavour Violation
R. Alonso, M. B. Gavela, L. Merlo +1
Assuming the Minimal Flavour Violation hypothesis, we derive the general scalar potential for fields whose background values are the Yukawa couplings. We analyze the minimum of the…
Revisiting Bimaximal Neutrino Mixing in a Model with S4 Discrete Symmetry
G. Altarelli, F. Feruglio, L. Merlo
In view of the fact that the data on neutrino mixing are still compatible with a situation where Bimaximal mixing is valid in first approximation and it is then corrected by terms…
Flavour with a Light Dynamical "Higgs Particle"
R. Alonso, M. B. Gavela, L. Merlo +2
The Higgs-fermion couplings are sensitive probes of possible new physics behind a stable light Higgs particle. It is then essential to identify the flavour pattern of those interac…
Disentangling a dynamical Higgs
I. Brivio, T. Corbett, O. J. P. Ãboli +5
The pattern of deviations from Standard Model predictions and couplings is different for theories of new physics based on a non-linear realization of the gau…
Exotic Vector-Like Quark Phenomenology in the Minimal Linear Model
J. A. Aguilar-Saavedra, J. Alonso-Gonzalez, L. Merlo +1
Extensions of the Standard Model that include vector-like quarks commonly also include additional particles that may mediate new production or decay modes. Using as example the min…
A Light Dynamical Scalar Boson
R. Alonso, M. B. Gavela, L. Merlo +2
With the discovery of a scalar resonance at ATLAS and CMS, the understanding of the electroweak symmetry breaking origin seems a much closer goal. A strong dynamics at relatively l…
ALPs Effective Field Theory and Collider Signatures
I. Brivio, M. B. Gavela, L. Merlo +4
We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo)Goldstone boson. Two possible frameworks for electroweak symmetry…
Analysis of General Power Counting Rules in Effective Field Theory
M. B. Gavela, E. E. Jenkins, A. V. Manohar +1
We derive the general counting rules for a quantum effective field theory (EFT) in dimensions. The rules are valid for strongly and weakly coupled theories, and predic…
Non-linear Higgs portal to Dark Matter
I. Brivio, M. B. Gavela, L. Merlo +4
The Higgs portal to scalar Dark Matter is considered in the context of non-linearly realised electroweak symmetry breaking. We determine the dominant interactions of gauge bosons a…
CP violation with a dynamical Higgs
M. B. Gavela, J. Gonzalez-Fraile, M. C. Gonzalez-Garcia +3
We determine the complete set of independent gauge and gauge-Higgs CP-odd effective operators for the generic case of a dynamical Higgs, up to four derivatives in the chiral expans…
Gauged Lepton Flavour
R. Alonso, E. Fernandez Martinez, M. B. Gavela +3
The gauging of the lepton flavour group is considered in the Standard Model context and in its extension with three right-handed neutrinos. The anomaly cancellation conditions lead…
Predictive Leptogenesis from Minimal Lepton Flavour Violation
L. Merlo, S. Rosauro-Alcaraz
A predictive Leptogenesis scenario is presented based on the Minimal Lepton Flavour Violation symmetry. In the realisation with three right-handed neutrinos transforming under the…
The Minimal Flavour Violating Axion
F. Arias-Aragon, L. Merlo
The solution to the Strong CP problem is analysed within the Minimal Flavour Violation (MFV) context. An Abelian factor of the complete flavour symmetry of the fermionic kinetic te…
On the Potential of Leptonic Minimal Flavour Violation
R. Alonso, M. B. Gavela, D. Hernández +1
Minimal Flavour Violation can be realized in several ways in the lepton sector due to the possibility of Majorana neutrino mass terms. We derive the scalar potential for the fields…
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector
D. de Florian, C. Grojean, F. Maltoni +373
This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the sta…
Higgs ultraviolet softening
I. Brivio, O. J. P. Ãboli, M. B. Gavela +3
We analyze the leading effective operators which induce a quartic momentum dependence in the Higgs propagator, for a linear and for a non-linear realization of electroweak symmetry…
Revisiting the production of ALPs at B-factories
L. Merlo, F. Pobbe, S. Rigolin +1
In this paper, the production of Axion-Like Particles (ALPs) at -factories via the process is revisited. To this purpose, the relevant cross-section is computed…
Searching for BSM Physics in Yukawa Couplings and Flavour Symmetries
J. Alonso-Gonzalez, A. de Giorgi, L. Merlo +1
In the framework of the Standard Model Effective Field Theory, we compare the lower bounds on the scale of new physics possibly contributing to the effective couplings,…
Minimal Flavour Violation with Strong Higgs Dynamics
R. Alonso, M. B. Gavela, L. Merlo +2
We develop a variant of the Minimal Flavour Violation ansatz for the case of a strongly interacting heavy-Higgs boson sector. The tower of effective operators differs from that for…
Phenomenological Consequences of See-Saw in S4 Based Models
F. Bazzocchi, L. Merlo, S. Morisi
It was proposed a flavour model based on the symmetry group S4, managing to describe fermion masses and mixings. The Weinberg operator has been used in order to provide the smallne…
Probing Effective Field Theory Approach in the CP Violating Minimal Linear Model
J. Alonso-Gonzalez, J. M. Lizana, V. Martinez-Fernandez +2
The Minimal Linear Model is a useful theoretical laboratory. One can investigate in a perturbative renormalisable model the properties of the Higgs boson as a pseudo-Goldstone…
Distinguishing A Higgs-Like Dilaton Scenario With A Complete Bosonic Effective Field Theory Basis
P. Hernandez-Leon, L. Merlo
A Higgs-like dilaton owns couplings that differ from those of the Standard Model Higgs and of a generic Composite Higgs. The complete bosonic basis for a Higgs-like dilaton is pres…
Tri-Bimaximal Lepton Mixing and Leptogenesis
D. Aristizabal Sierra, F. Bazzocchi, I. de Medeiros Varzielas +2
In models with flavour symmetries added to the gauge group of the Standard Model the CP-violating asymmetry necessary for leptogenesis may be related with low-energy parameters. A…