Rodrigo Alonso

Fermion Masses and Mixings from a Minimum Principle

Rodrigo Alonso

We analyze the structure of quark and lepton mass matrices under the hypothesis that they are determined from a minimum principle applied to a generic potential invariant under the…

Sigma Models with Negative Curvature

Rodrigo Alonso, Elizabeth E. Jenkins, Aneesh V. Manohar

We construct Higgs Effective Field Theory (HEFT) based on the scalar manifold H^n, which is a hyperbolic space of constant negative curvature. The Lagrangian has a non-compact O(n,…

A Geometric Formulation of Higgs Effective Field Theory: Measuring the Curvature of Scalar Field Space

Rodrigo Alonso, Elizabeth E. Jenkins, Aneesh V. Manohar

A geometric formulation of Higgs Effective Field Theory (HEFT) is presented. Experimental observables are given in terms of geometric invariants of the scalar sigma model sector su…

hep-ph2018

Tau Polarimetry in B Meson Decays

Rodrigo Alonso, Jorge Martin Camalich, Susanne Westhoff

This article summarizes recent developments in $B \to D^{(*)} I ¨ I^½$ decays. We explain how to extract the tau lepton's production properties from the kinematics of its decay produ…

hep-ph2011

Minimal flavour violation extensions of the seesaw

Rodrigo Alonso, Gino Isidori, Luca Merlo +2

We analyze the most natural formulations of the minimal lepton flavour violation hypothesis compatible with a type-I seesaw structure with three heavy singlet neutrinos N, and sati…

cond-mat.stat-mech2025

Active energy harvesting and work transduction by hair-cell bundles in bullfrog's inner ear

Yanathip Thipmaungprom, Laila Saliekh, Rodrigo Alonso +3

Hair cells actively drive oscillations of their mechanosensitive organelles--the hair bundles that enable hearing and balance sensing in vertebrates. Why and how some hair cells ex…

Lepton (non-) unversality in (flavor changing) neutral current B decays

Rodrigo Alonso

The following proceedings contain a theory perspective on the flavor changing neutral current anomalies reported by LHCb on the ratios $B \to K^{(*)} I^¼ I^¼/ B \to K^{(*)} ee$

Wormholes and masses for Goldstone bosons

Rodrigo Alonso, Alfredo Urbano

There exist non-trivial stationary points of the Euclidean action for an axion particle minimally coupled to Einstein gravity, dubbed wormholes. They explicitly break the continuos…

hep-ph2015

Lepton universality violation and lepton flavor conservation in $B$ -meson decays

Rodrigo Alonso, BenjamÃn Grinstein, Jorge Martin Camalich

Anomalies in (semi)leptonic $B$ -meson decays present interesting patterns that might be revealing the shape of the new physics to come. In order to understand the experimental data…

Renormalization group evolution of dimension-six baryon number violating operators

Rodrigo Alonso, Hsi-Ming Chang, Elizabeth E. Jenkins +2

We calculate the one-loop anomalous dimension matrix for the dimension-six baryon number violating operators of the Standard Model effective field theory, including right-handed ne…

Renormalization Group Evolution of the Standard Model Dimension Six Operators III: Gauge Coupling Dependence and Phenomenology

Rodrigo Alonso, Elizabeth E. Jenkins, Aneesh V. Manohar +1

We calculate the gauge terms of the one-loop anomalous dimension matrix for the dimension-six operators of the Standard Model effective field theory (SM EFT). Combining these resul…

hep-ph2022

On the road(s) to the Standard Model

Rodrigo Alonso, Mia West

Experimental measurements point at the Standard Model (SM) as the theory of electroweak symmetry breaking, but as we close in on our characterization the question arises of what li…

$S U (2) \times U (1)$ gauge invariance and the shape of new physics in rare $B$ decays

Rodrigo Alonso, Benjamin Grinstein, Jorge Martin Camalich

New physics effects in $B$ decays are routinely modeled through operators invariant under the strong and electromagnetic gauge symmetries. Assuming the scale for new physics is wel…

Geometry of the Scalar Sector

Rodrigo Alonso, Elizabeth E. Jenkins, Aneesh V. Manohar

The $S$ -matrix of a quantum field theory is unchanged by field redefinitions, and so only depends on geometric quantities such as the curvature of field space. Whether the Higgs mu…

hep-ph2025

Charge quantisation, monopoles and emergent symmetry in the Standard Model and its embeddings

Rodrigo Alonso, Despoina Dimakou, Yunji Ha +1

This work studies the connection of the global properties of the SM gauge group to 1-form discrete symmetries, the possible non-Abelian embeddings of the SM group, and electric and…

hep-th2024

On the effective action for scalars in a general manifold to any loop order

Rodrigo Alonso, Mia West

Functional methods and a derivative expansion are employed for laying out a procedure to compute the effective action to any loop order, for scalar fields parametrising an arbitrar…

hep-ph2015

Holomorphy without Supersymmetry in the Standard Model Effective Field Theory

Rodrigo Alonso, Elizabeth E. Jenkins, Aneesh V. Manohar

The anomalous dimensions of dimension-six operators in the Standard Model Effective Field Theory (SMEFT) respect holomorphy to a large extent. The holomorphy conditions are reminis…

hep-ph2026

Assessing (H)EFT theory errors by pitting EoM against Field Redefinitions

Rodrigo Alonso, Christoph Englert, Wrishik Naskar +1

Truncations of effective field theory expansions are technically necessary but inherently intertwined with the redundancies of general field redefinitions. This can be viewed as a…

Walls, bubbles and doom -- the cosmology of HEFT

Rodrigo Alonso, Juan Carlos Criado, Rachel Houtz +1

As experiment charts new territory at the electroweak scale, the enterprise to characterise all possible theories becomes all the more necessary. In the absence of new particles, t…

Counting and building operators in theories with hidden symmetries and application to HEFT

Rodrigo Alonso, Shakeel Ur Rahaman

Identifying a full basis of operators to a given order is key to the generality of Effective Field Theory (EFT) and is by now a problem of known solution in terms of the Hilbert se…

quant-ph2018

Scattering of light dark matter in atomic clocks

Peter Wolf, Rodrigo Alonso, Diego Blas

We present a detailed analysis of the effect of light Dark Matter (DM) on atomic clocks, for the case where DM mass and density are such that occupation numbers are low and DM must…

Flavoured $B - L$ Local Symmetry and Anomalous Rare $B$ Decays

Rodrigo Alonso, Peter Cox, Chengcheng Han +1

We consider a flavoured $B - L$ gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies (~TeV) while still allowing for…

hep-ph2020

Kick-alignment: matter asymmetry sourced dark matter

Rodrigo Alonso, Jakub Scholtz

We investigate the possibility that the dark matter abundance is sourced by the baryon/lepton asymmetry of the early Universe. It turns out that a Goldstone field of a local classi…

hep-ph2012

Muon conversion to electron in nuclei in type-I seesaw models

Rodrigo Alonso, Mikael Dhen, Belen Gavela +1

We compute the muon to electron conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The results are compared with previous computa…

Sigma Decomposition

Rodrigo Alonso, Ilaria Brivio, Belen Gavela +2

In composite Higgs models the Higgs is a pseudo-Goldstone boson of a high-energy strong dynamics. We have constructed the effective chiral Lagrangian for a generic symmetric coset,…

hep-ph2025

Sensitivity of $W$ -boson measurements to low-mass right-handed neutrinos

Rodrigo Alonso, Sam Bates, Chris Hays +2

A low-mass right-handed neutrino could interact with electroweak bosons via mixing, a mediator particle, or loop corrections. Using an effective field theory, we determine constrai…

The lifetime of the $B_{c}^{-}$ meson and the anomalies in $B \to D^{(*)} I ¨ I^½$

Rodrigo Alonso, BenjamÃn Grinstein, Jorge Martin Camalich

We investigate a new constraint on new-physics interpretations of the anomalies observed in $B \to D^{(*)} I ¨ I^½$ decays making use of the lifetime of the $B_{c}^{-}$ meson. A constraint…

hep-ph2026

The Potential of HEFT and the scale of New Physics

Rodrigo Alonso, Susobhan Chattopadhyay, James Ingoldby

We employ a geometric framework to compute the leading high-energy behaviour of tree-level scattering amplitudes in theories containing $N$ Nambu-Goldstone bosons and a single Higg…

Covariant derivative expansion for the renormalization of gravity

Rodrigo Alonso

The one loop UV divergences of Hilbert-Einstein gravity with a cosmological constant and spin 0, 1/2 and 1 matter are computed making use of a covariant derivative expansion and fu…

Anomaly-free local horizontal symmetry and anomaly-full rare B-decays

Rodrigo Alonso, Peter Cox, Chengcheng Han +1

The largest global symmetry that can be made local in the Standard Model + 3 $I^½_{R}$ while being compatible with Pati-Salam unification is $S U (3)_{H} \times U (1)_{B - L}$ . The gauge boson…

hep-th2025

A particle physicist lacing their shoes

Rodrigo Alonso

This letter presents the solution to a counting problem, to the best of our knowledge not known in full generality, which can be mapped to both (i) ways to lace a $N$ -holes-per-sid…

hep-ph2023

A primer on Higgs Effective Field Theory with Geometry

Rodrigo Alonso

These lecture notes, prepared for the 2022 QUC summer school at KIAS, provide an introduction to Higgs Effective Field Theory and the use of field geometry in Quantum Field Theory.…

hep-ph2010

Summary report of MINSIS workshop in Madrid

Rodrigo Alonso, Stefan Antusch, Mattias Blennow +22

Recent developments on tau detection technologies and the construction of high intensity neutrino beams open the possibility of a high precision search for non-standard Î¼ - Ï fla…

Tau properties in $B \to D I ¨ I^½$ from visible final-state kinematics

Rodrigo Alonso, Jorge Martin Camalich, Susanne Westhoff

In semi-leptonic $B$ decays with a tau lepton, features of the production process are imprinted on the tau helicity states. Since the tau momentum cannot be fully reconstructed exp…

hep-ph2013

Dynamical Yukawa Couplings

Rodrigo Alonso

The matter content of the Standard Model admits a global symmetry due to the generational structure of the spectrum respected by all interactions except for fermion couplings to th…

hep-ph2018

A clockwork solution to the flavor puzzle

Rodrigo Alonso, Adrian Carmona, Barry M. Dillon +3

We introduce a set of clockwork models of flavor that can naturally explain the large hierarchies of the Standard Model quark masses and mixing angles. Since the clockwork only con…

hep-ph2026

Dyonic lattices, $I^¸$ -angles and axions in the Standard Model

Rodrigo Alonso, Francesca Chadha-Day, Despoina Dimakou +2

We investigate the implications of the Witten effect in the Standard Model with a general global gauge group structure and determine the values of the three $I^¸$ -parameters that le…

New physics in the kinematic distributions of $B ˉ \to D^{(*)} I ¨ ^{-} (\to ℓ^{-} I^ˉ ½_{ℓ} I^½_{I ¨} ) I^ˉ ½_{I ¨} $

Rodrigo Alonso, Andrew Kobach, Jorge Martin Camalich

We investigate the experimentally-accessible kinematic distributions of the $B ˉ \to D^{(*)} I ¨ ^{-} (\to ℓ^{-} I^ˉ ½_{ℓ} I^½_{I ¨} ) I^ˉ ½_{I ¨} $ decays. Specifically, we study the decay rat…

Fractional-charge hadrons and leptons to tell the Standard Model group apart

Rodrigo Alonso, Despoina Dimakou, Mia West

The gauge group of strong and electroweak interactions in Nature could be any of the four that share the same Lie algebra, $S U (3)_{c} \times S U (2)_{L} \times U (1)_{Y} / Z_{p} \equiv G_{p}$ with $…

hep-ph2021

Prospects for direct CP tests of $h q q$ interactions

Rodrigo Alonso, Cristofero Fraser-Taliente, Chris Hays +1

We study the prospects for probing the CP structure of $h q q$ interactions using the decays of the lightest baryon $I^_{q}$ formed in the quark's hadronization. The low yields of reco…

Exploring the ultra-light to sub-MeV dark matter window with atomic clocks and co-magnetometers

Rodrigo Alonso, Diego Blas, Peter Wolf

Particle dark matter could have a mass anywhere from that of ultralight candidates, $m_{I ¨} \sim 1 0^{- 21}$ eV, to scales well above the GeV. Conventional laboratory searches are sens…