135 citations · 822 across the 18 of their papers we have counts for
15 papers · 1 filter
Building blocks of the flavourful SMEFT RG
Camila S. Machado, Sophie Renner, Dave Sutherland
A powerful aspect of effective field theories is connecting scales through renormalisation group (RG) flow. The anomalous dimension matrix of the Standard Model Effective Field The…
Theoretical developments in the SMEFT at dimension-8 and beyond
Simone Alioli, Radja Boughezal, Weiguang Cao +24
In this contribution to the Snowmass 2021 process we review theoretical developments in the Standard Model Effective Field Theory (SMEFT) with a focus on effects at the dimension-8…
On-shell effective theory for higher-spin dark matter
Adam Falkowski, Giulia Isabella, Camila S. Machado
We apply the on-shell amplitude techniques in the domain of dark matter. Without evoking fields and Lagrangians, an effective theory for a massive spin- particle is defined in t…
Constructing massive on-shell contact terms
Gauthier Durieux, Teppei Kitahara, Camila S. Machado +2
The purely on-shell approach to effective field theories requires the construction of independent contact terms. Employing the little-group-covariant massive-spinor formalism, we p…
Enumerating higher-dimensional operators with on-shell amplitudes
Gauthier Durieux, Camila S. Machado
We establish a simple formula for the minimal dimension of operators leading to any helicity amplitude. It eases the systematic enumeration of independent operators from the constr…
Gravitational wave probes of axion-like particles
Camila S. Machado, Wolfram Ratzinger, Pedro Schwaller +1
We have recently shown that axions and axion-like particles (ALPs) may emit an observable stochastic gravitational wave (GW) background when they begin to oscillate in the early un…
The Super-Planckian Axion Strikes Back
Nayara Fonseca, Benedict von Harling, Leonardo de Lima +1
We present a novel framework for obtaining large hierarchies in axion decay constants as well as trans-Planckian field excursions, with no need for tuning or a large number of fiel…
The Rise of SMEFT On-shell Amplitudes
Rafael Aoude, Camila S. Machado
We present a map between the tree-level Standard Model Effective Theory (SMEFT) in the Warsaw basis and massive on-shell amplitudes. As a first step, we focus on the electroweak se…
Audible Axions
Camila S. Machado, Wolfram Ratzinger, Pedro Schwaller +1
Conventional approaches to probing axions and axion-like particles (ALPs) typically rely on a coupling to photons. However, if this coupling is extremely weak, ALPs become invisibl…
A warped relaxion
Nayara Fonseca, Benedict von Harling, Leonardo de Lima +1
We construct a UV completion of the relaxion in a warped extra dimension. We identify the relaxion with the zero mode of the fifth component of a bulk gauge field and show how hier…
Neutrinos in Large Extra Dimensions and Short-Baseline Appearance
Marcela Carena, Ying-Ying Li, Camila S. Machado +2
We show that, in the presence of bulk masses, sterile neutrinos propagating in large extra dimensions (LED) can induce electron-neutrino appearance effects. This is in contrast to…
Helicity Selection Rules and Non-Interference for BSM Amplitudes
Aleksandr Azatov, Roberto Contino, Camila S. Machado +1
Precision studies of scattering processes at colliders provide powerful indirect constraints on new physics. We study the helicity structure of scattering amplitudes in the SM and…
N-Relaxion: Large Field Excursions from a Few Site Relaxion Model
Nayara Fonseca, Leonardo de Lima, Camila S. Machado +1
Relaxion models are an interesting new avenue to explain the radiative stability of the Standard Model scalar sector. They require very large field excursions, which are difficult…
Higgs Flavor Violation as a Signal to Discriminate Models
Leonardo de Lima, Camila S. Machado, Ricardo D. Matheus +1
We consider the Higgs Lepton Flavor Violating process , in which CMS found a excess of events, from a model independent perspective, and find that it is d…
Modification of the B Meson Mass in a Magnetic Field from QCD Sum Rules
Camila S. Machado, Stefano I. Finazzo, Ricardo D. Matheus +1
In this paper we extend the well known QCD sum rules used in the calculation of the mass of heavy mesons to estimate the modification of the charged B meson mass, m_B, in the prese…