Publications (63)
Axions are blind to anomalies
Jérémie Quevillon, Christopher Smith
The axion couplings to SM gauge bosons are derived in various models, and shown to always arise entirely from non-anomalous fermion loops. They are thus independent of the anomaly…
Rare K decays: Challenges and Perspectives
Christopher Smith
At this stage of the LHC program, the prospect for a new physics signal in the very rare K ---> pi nu nu bar decays may be dented, but remains well alive thanks to their intrinsic…
Tracking down penguins at the poles
Jean-Marc Gerard, Christopher Smith, Stephanie Trine
QCD penguins are responsible for about 2/3 of the Delta I=1/2 rule in K to pi pi decays, as inferred from a combined analysis of K to pi pi and KL to gamma gamma. Further tests bas…
The Grenoble Axion Haloscope platform (GrAHal): development plan and first results
Thierry Grenet, Rafik Ballou, Quentin Basto +6
In this note we report on the development plans and first results of the Grenoble Axion Haloscope (GrAHal) project. It is aimed at developing a haloscope platform dedicated to the…
The matrix type of purely infinite simple Leavitt path algebras
Gene Abrams, Christopher Smith
Let denote the purely infinite simple unital Leavitt path algebra . We completely determine the pairs of positive integers for which there is an isomorphism of ma…
The rare decay KL -> pi0 mu+ mu- within the SM
Gino Isidori, Christopher Smith, Rene Unterdorfer
We present an updated analysis of the rare decay within the Standard Model. In particular, we present the first complete calculation of the two-photon…
Theory review on rare K decays: Standard Model and beyond
Christopher Smith
The theoretical status of the rare K --> pi nu nu, KL --> pi0 l+ l- and KL --> mu+ mu- decays in the Standard Model is reviewed. Their sensitivity to New Physics and their discrimi…
Supersymmetric models with minimal flavour violation and their running
Gilberto Colangelo, Emanuel Nikolidakis, Christopher Smith
We revisit the formulation of the principle of minimal flavor violation (MFV) in the minimal supersymmetric extension of the standard model, both at moderate and large tan(beta), a…
EDM constraints on flavored CP-violating phases
Lorenzo Mercolli, Christopher Smith
The CP-violating phenomenology of the MSSM with Minimal Flavor Violation (MFV) in the lepton sector is revisited. To this end, the most general parametrizations of the slepton soft…
Axion Effective Action
Jérémie Quevillon, Christopher Smith, Pham Ngoc Hoa Vuong
In this paper, we discuss the construction of Effective Field Theories (EFTs) in which a chiral fermion, charged under both gauge and global symmetries, is integrated out. Inspired…
Constraining Higgs mediated dark matter interactions
Admir Greljo, J. Julio, Jernej F. Kamenik +2
We perform an analysis of Higgs portal models of dark matter (DM), where DM is light enough to contribute to invisible Higgs decays. Using effective field theory we show that DM ca…
Towards a new paradigm for quark-lepton unification
Christopher Smith
The quark and lepton mass patterns upset their naive unification. In this paper, a new approach to solve this problem is proposed. Model-independently, we find that a successful un…
Improved estimates of rare K decay matrix-elements from Kl3 decays
Federico Mescia, Christopher Smith
The estimation of rare K decay matrix-elements from Kl3 experimental data is extended beyond LO in Chiral Perturbation Theory. Isospin-breaking effects at NLO (and partially NNLO)…
Minimal flavor violation in supersymmetric theories
Christopher Smith
The minimal flavor violation hypothesis is presented in the context of the MSSM. Its fundamental principles are introduced and motivated, and its phenomenological consequences for…
Long-distance effects in rare and radiative K decays
Christopher Smith
The electroweak structures of the FCNC-induced rare and radiative K decays are presented. While the former decays are sensitive to short-distance physics and offer exceptional prob…
Variations on the SU(5) axion
Jérémie Quevillon, Christopher Smith
The simultaneous embeddings of an axion state and a seesaw mechanism within the SU(5) Grand Unification Theory, both minimal and flipped, are systematically studied. It is shown th…
Improving Clinical Note Generation from Complex Doctor-Patient Conversation
Yizhan Li, Sifan Wu, Christopher Smith +2
Writing clinical notes and documenting medical exams is a critical task for healthcare professionals, serving as a vital component of patient care documentation. However, manually…
Wiggle: Physical Challenge-Response Verification of Vehicle Platooning
Connor Dickey, Christopher Smith, Quentin Johnson +4
Autonomous vehicle platooning promises many benefits such as fuel efficiency, road safety, reduced traffic congestion, and passenger comfort. Platooning vehicles travel in a single…
Could a light Higgs boson illuminate the dark sector?
Jernej F. Kamenik, Christopher Smith
The impact a new neutral light particle of spin 0, 1/2, 1, or 3/2 could have on the tiny width of a light Higgs boson is systematically analyzed. To this end, we include all the re…
Exploring the flavour structure of the MSSM with rare K decays
Gino Isidori, Federico Mescia, Paride Paradisi +2
We present an extensive analysis of rare K decays, in particular of the two neutrino modes K+->pi+ nu nu-bar and KL->pi0 nu nu-bar, in the Minimal Supersymmetric extension of the S…
Dark-matter induced neutron-antineutron oscillations
Théo Brugeat, Christopher Smith
If dark matter carries a baryon number of two, neutron-antineutron oscillations could require its presence to manifest themselves. If it is in addition very light, in the micro-eV…
The s ---> d gamma decay in and beyond the Standard Model
Philippe Mertens, Christopher Smith
The New Physics sensitivity of the s ---> d gamma transition and its accessibility through hadronic processes are thoroughly investigated. Firstly, the Standard Model predictions f…
The Polymorphic Chiral Anomaly
Christopher Smith
The chiral anomaly famously manifests in a rich variety of forms, from abelian and singlet to consistent or covariant. In this paper, all these realizations are described in detail…
KL to pi0 e+ e- and KL to pi0 mu+ mu- : A binary star on the stage of flavor physics
Federico Mescia, Christopher Smith, Stephanie Trine
A systematic analysis of New Physics impacts on the rare decays KL to pi0 l+ l- is performed. Thanks to their different sensitivities to flavor-changing local effective interaction…
Rare K and B decays with non-standard missing energy
Christopher Smith
The rare K and B semileptonic decays into neutrino pairs are well-known to be extremely sensitive to non-standard physics in the quark sector. In this talk, their capabilities to s…
The Flavour of Natural SUSY
Felix Brümmer, Sabine Kraml, Suchita Kulkarni +1
An inverted mass hierarchy in the squark sector, as in so-called "natural supersymmetry", requires non-universal boundary conditions at the mediation scale of supersymmetry breakin…
Light-quark Loops in K->pi nu nu
Gino Isidori, Christopher Smith, Federico Mescia
We present a comprehensive analysis of the contributions to K->pi nu nu decays not described by the leading dimension-six effective Hamiltonian. These include both dimension-eight…
Recent progress on the rare decay KL to pi0 mu+ mu-
Christopher Smith
The rare decay KL to pi0mu+mu- has a significant CP-conserving contribution. The reliable theoretical estimation of this piece from the experimental pi0-two photon branching ratio…
The KPF-SLOPE Survey - Small, Compact Multi-Planet Systems Appear Spin-Orbit Aligned
Luke B. Handley, Andrew W. Howard, Fei Dai +16
The angle between stellar spin axes and planetary orbits -- stellar obliquity -- probes the dynamics of planetary migration and evolution. The obliquities of giant planets have bee…
Real-time earthquake warning for astronomical observatories
Michael Coughlin, Christopher Stubbs, Sergio Barrientos +4
Early earthquake warning is a rapidly developing capability that has significant ramifications for many fields, including astronomical observatories. In this work, we describe the…
The strong CP puzzle and axions
Christopher Smith
In the first part of this talk, after a brief presentation of the strong CP puzzle, the construction of axion models and their main phenomenological features are described. In the…
Quark-lepton flavored unification
Christopher Smith
The unification of the quark and charged lepton flavor structures is revisited using the tools of Minimal Flavor Violation (MFV). Under that framework, we first identify a unique p…
EDM with and beyond flavor invariants
Christopher Smith, Selim Touati
In this paper, the flavor structure of quark and lepton EDMs in the SM and beyond is investigated using tools inspired from Minimal Flavor Violation. While Jarlskog-like flavor inv…
Baryonic R-parity violation and its running
Jeremy Bernon, Christopher Smith
Baryonic R-parity violation arises naturally once Minimal Flavor Violation (MFV) is imposed on the supersymmetric flavor sector at the low scale. At the same time, the yet unknown…
French HEP community input to the European Strategy for Particle Physics
Yasmine Amhis, Jeremy Andrea, Etienne Augé +23
In view of the European Strategy for Particle Physics process, the French HEP community has organized a national process of collecting written contributions and has pursued a serie…
Dark higher-form portals and duality
Cypris Plantier, Christopher Smith
Light scalar or vector particles are among the most studied dark matter candidates. Yet, those are always described as scalar or vector fields. In this paper, we explore instead th…
Leptoquarks, axions and the unification of B, L, and Peccei-Quinn symmetries
Fernando Arias-Aragón, Christopher Smith
In this paper, axion models supplemented by leptoquarks and diquarks are systematically analyzed. Turning on some couplings to and among these latter states permits to unify the Pe…
The same-sign top signature of R-parity violation
Gauthier Durieux, Christopher Smith
Baryonic R-parity violation could explain why low-scale supersymmetry has not yet been discovered at colliders: sparticles would be hidden in the intense hadronic activity. However…
Very low energy matching of effective meson theories with QCD
Christopher Smith
A simple matching procedure is proposed to extract constraints on effective meson theories. In this way, a QCD prediction for the pion decay constant is found, F(pi)=2 m(pi)/pi, i.…
Long-Distance Effects in Rare K Decays
Christopher Smith
Rare K decays provide for very clean tests of the Standard Model, and are especially suited to search for New Physics signal. In this talk, recent progresses in the estimation of l…
SU(N) Elastic Rescattering in B and D Decays
Christopher Smith
The treatment of elastic final state interactions (FSI) under a symmetry group is presented. The proposed model is based on Watson's theorem, i.e. on symmetry properties of the S-m…
Tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu in the Standard Model
Jernej F. Kamenik, Christopher Smith
The tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu are analyzed and compared to those occurring in K+ --> pi+ nu…
Baryon and lepton number intricacies in axion models
Jérémie Quevillon, Christopher Smith
Because the Peccei-Quinn (PQ) symmetry has to be anomalous to solve the strong CP puzzle, some colored and chiral fermions have to transform non-trivially under this symmetry. But…
Recent progress on supersymmetric effects in rare K decays
Christopher Smith
The dominant MSSM effects in the rare K decays, K+ --> pi+ nu nu bar, KL --> pi0 nu nu bar, KL --> pi0 e+ e- and KL --> pi0 mu+ mu-, are discussed both within and without the minim…
Dark higher-form fields and triangle anomalies
Cypris Plantier, Christopher Smith
Light scalar and vector particles admit non-trivial descriptions in terms of anti-symmetric higher-rank tensor fields. Far from mere rewritings, these provide compelling alternativ…
Three-generation baryon and lepton number violation at the LHC
Gauthier Durieux, Jean-Marc Gérard, Fabio Maltoni +1
One of the most puzzling questions in particle physics concerns the status of the baryon (B) and lepton (L) quantum numbers. On the theoretical side, most new physics scenarios nat…
Minimal Flavor Violation, Seesaw, and R-parity
Emanuel Nikolidakis, Christopher Smith
The Minimal Flavor Violation hypothesis (MFV) is extended to the R-parity violating MSSM, supplemented with a simple seesaw mechanism. The requirement of MFV is shown to suppress l…
Minimal Flavor Violation as an alternative to R-parity
Christopher Smith
A peculiar aspect of the MSSM, the simplest supersymmetric extension of the Standard Model, is that it is usually defined including an ad hoc symmetry, R-parity, whose sole purpose…
Arcs on spheres intersecting at most twice
Christopher Smith, Piotr Przytycki
Let p be a puncture of a punctured sphere, and let Q be the set of all other punctures. We prove that the maximal cardinality of a set of arcs pairwise intersecting at most once, w…
The effective action for gauge bosons
Jérémie Quevillon, Christopher Smith, Selim Touati
By treating the vacuum as a medium, H. Euler and W. Heisenberg estimated the non-linear interactions between photons well before the advent of Quantum Electrodynamics. In a modern…
Theoretical perspective on the NA62 physics program
Christopher Smith
Soon the NA62 experiment will start looking for the rare K+ ---> pi+ nu nu bar decay. In this talk, its theoretical interests, together with those of the neutral rare decays KL ---…
Could the width of the diphoton anomaly signal a three-body decay ?
Jérémy Bernon, Christopher Smith
The recently observed diphoton anomaly at the LHC appears to suggest the presence of a rather broad resonance. In this note, it is pointed out that this does not hold if the two ph…
What rare K decays can tell about the MSSM
Christopher Smith
The supersymmetric contributions to the theoretically clean K+ --> pi+ nu nu bar, KL --> pi0 nu nu bar, KL --> pi0 e+ e- and KL --> pi0 mu+ mu- decays are briefly reviewed. Particu…
FCNC portals to the dark sector
Jernej F. Kamenik, Christopher Smith
The most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. The SM gauge invariance is enforced, and operators of lowest di…
Are B to PI K CP-asymmetries quantized ?
Jean-Marc Gerard, Christopher Smith
Search for patterns in the numerous B-decay modes now available is necessary in order to test the Cabibbo-Kobayashi-Maskawa theory of CP-violation. In particular, the well-structur…
Radiative Kaon Decays and the Penguin Contribution to the Delta I = 1/2 Rule
Jean-Marc Gerard, Christopher Smith, Stephanie Trine
A consistent census of penguins in the Delta I = 1/2 rule is taken from the eta0 pole contribution to the radiative KL to gamma gamma, KS to pi0 gamma gamma and K+ to pi+ gamma gam…
Axion-like ALPs
Fernando Arias-Aragón, Jérémie Quevillon, Christopher Smith
The Effective Field Theory (EFT) Lagrangian for a generic axion-like particle (ALP) has many free parameters, and leaves quite some freedom for the expected phenomenology. In this…
Searching for dominant rescattering sources in B to two pseudoscalar decays
Christopher Smith
Various rescattering sources are analyzed in the context of the SU(3) flavor symmetry. In particular, the possibility to account for intermediate charm at the hadronic level in B t…
Realizing posets as prime spectra of Leavitt path algebras
Gene Abrams, Gonzalo Aranda Pino, Zachary Mesyan +1
We associate in a natural way to any partially ordered set a directed graph (where the vertices of correspond to the elements of , and the edges of …
Rare K decays in the Standard Model
Christopher Smith
The very clean theoretical predictions for the rare decays K --> pi nu nu_bar and KL --> pi0 l+ l- are reviewed, and their various theoretical inputs summarized. The less favorable…
On the fermionic couplings of axionic dark matter
Christopher Smith
In the non-relativistic limit, two types of dark matter axion interactions with fermions are thought to dominate: one is induced by the spatial gradient of the axion field and call…
Proton stability from a fourth family
Christopher Smith
The possibility to violate baryon or lepton number without introducing any new flavor structures, beyond those needed to account for the known fermion masses and mixings, is analyz…
What could be learnt from Positronium for Quarkonium?
Christopher Smith
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay computations is proposed, in which the binding energy is treated non-perturbatively.…