Single pion production datasets from the Argonne (ANL) and Brookhaven (BNL) Bubble Chamber neutrino experiments are heavily used to test and tune pion production models. Measurements as a function of the true neutrino energy ($E_{\nu}$) and four-momentum transfer ($Q^{2}$) are typically used for this purpose, so our objective is to investigate and utilize other observables that are also...
The interactions between neutrinos and target nuclei resting in neutrino detectors are demanding to study both experimentally and theoretically. Thus, systematic uncertainties in neutrino interaction cross sections are usually the largest uncertainties reported by long-baseline neutrino oscillation experiments. Recent experimental results on Final State Interactions (FSI) show that theoretical...
Different constraints to the neutrino electric millicharge (NEM) have been achieved by studying interactions such as the elastic neutrino-electric scattering (ENES). In recent years, bounds on this parameter are also being obtained from data of the COHERENT experiment. We studied the potential of the coherent elastic neutrino-nucleus scattering (CEvNS) in future reactor neutrino experiments to...
In [1], we show that the presence of even one sterile neutrino of mass ∼1 eV can significantly impact the measurements of CP violation in long baseline experiments. Using a probability level analysis, we discuss the large magnitude of these effects, and show how they translate into significant event rate deviations at DUNE. Our results demonstrate that measurements which, when interpreted in...
Most observations in neutrino oscillation physics are well described within the three-neutrino paradigm. There are, however, some anomalies which might hint towards the existence of a fourth (and sterile) neutrino with eV-scale mass. I discuss the current status of searches of this type of neutrino at reactor experiments. I discuss the status of the rate anomaly and also the status of searches...
Solar neutrino scattering with electron via a light mediator, either scalar or vector can be searched in Xenon-based Dark Matter experiments. A keV sterile neutrino instead of an active neutrino can appear in the final state for the recoil electron. Such a scenario is difficult to probe in other types of experiments and can be used to obtain stringent bounds on new interactions. Moreover, a...
We studied a neutrino decay scenario as a potential solution to conciliate the tension between appearance and disappearance data at the short-baseline experiments. Particularly, we considered a heavy neutrino mass-eigenstate that decays into a usual light neutrino plus a massless scalar. Under this neutrino decay hypothesis, we fitted LSND and MiniBooNE electron neutrino appearance data...
In this talk I will review the broad array of new physics that can be found at neutrino experiments.
The interaction of an (external) decoherence environment with a neutrino system can turn on the Majorana phases in the neutrino oscillation channels $\nu \rightarrow \nu$ and and $\bar{\nu}\rightarrow \bar{\nu}$. As a consequence, and relying upon the value of the Majorana phase and the magnitude of the leading decoherence parameter, a distorted measurement of the Dirac CP violation phase...
The exchange of two neutrinos at one loop leads to a long-range parity-violating force between fermions. In this talk, I will explore the two-neutrino force in the backdrop of atomic physics. This is the largest parity-violating long-range force in the Standard Model. The effect of this force can be searched for in experiments that probe atomic parity violation by measuring the optical...
Dentro de los bloques constitutivos de la materia se encuentran los neutrinos, su estudio ha jugado un papel principal no sólo a la hora de confirmar las predicciones teóricas del modelo estándar (ME), sino también en la búsqueda de nueva física (NF). Una de las evidencias más claras de NF que tenemos hasta la fecha, se conoce como oscilaciones de neutrinos.
Actualmente la física de neutrinos...
Durante esta charla expondré mi propuesta de investigación de trabajo de grado para optar al título de pregrado de Físico. Se abordará el estudio de la dispersión elástica coherente neutrino-núcleo (CEvNS). Esta línea de investigación actualmente es un área muy activa de la física de neutrinos debido a su descubrimiento recientemente por parte de la colaboración COHERENT. Para el desarrollo de...
The latest data of the two long-baseline accelerator experiments NOνA and T2K, analysed in the standard 3-flavor scenario, display a discrepancy. A mismatch in the determination of the standard CP-phase $\delta_{CP}$ extracted by the two experiments is evident in the normal neutrino mass ordering. While NOνA prefers values close to $\delta_{CP}\sim 0.8\pi$, T2K identifies values of...
In most of the proposals for new physics beyond the standard model neutrinos have new interactions. Here we pointed out that some of these interactions have consequences which, although at present they seem purely academic, they probably have to be taken into account in the future neutrino experiments. They range from obscuring the neutrino mass ordering to misidentification of the flavour...
We will present an approach to study the sources of CP violation for baryogenesis models with quasi-degenerate neutrinos. The source term we obtain has contributions that can be identified with CP violation from mixing, oscillations and interference between both. The relative signs and sizes of these contributions will be discussed, as well as unitarity requirements and the connection to the...
In this talk, I discuss the investigation revolving around neutrino oscillations within the framework of extended theories of gravity. Based on the covariant reformulation of Pontecorvo’s formalism, the oscillation probability of neutrinos propagating in static spacetimes described by gravitational actions quadratic in the curvature invariants is evaluated. For the sake of simplicity,...
We study the potential of forward–backward and other angular asymmetries to reveal the production of heavy Majorana neutrinos with effective interactions in a simple benchmark scenario with dim-6 scalar, vector and tensor operators and neglecting the tiny heavy-active Type I seesaw mixings. Asymmetries between particles produced jointly with the N and its decay products, or indeed between...
We investigate a scenario inspired by natural supersymmetry, where neutrino data is explained within a low-scale seesaw scenario. For this the Minimal Supersymmetric Standard Model is extended by adding light right-handed neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the lightest neutralinos to be higgsino-like. We first update a previous analysis and assess to...
Neutrinos are not only a cornerstone of particle physics but also for cosmology. From the point of view of particle physics, neutrinos are fundamental particles (specifically neutral leptons), which in principle come in three flavors ($\nu_e,\nu_{\mu},\nu_{\tau}$) and have the property that they can be transformed into each other (Oscillations). Due to this property, it is well known that...
As the core-collapse supernova (CCSN) neutrinos cross the Earth, the matter effects introduce modulations on the CCSN neutrino spectra. Studying these modulations could help us to solve the neutrino mass ordering problem. However, the matter effect besides is expected to be rather small, could be difficult to observe because of the uncertainties in the calculation of the CCSN neutrino spectra...
Through the study of neutrino oscillations at the long-baseline NOvA Experiment, it is possible to explore some aspects of physics Beyond the Standard Model (BSM) on the neutrino sector. In this talk, we discuss the current status of the sensitivities on Non-Standard Interactions (NSI) parameters based on the muon (anti)neutrino disappearance simulated data. We focus on how the NSI...
On-shell scattering amplitudes are an interesting approach in which amplitudes can be computed without introducing any field nor Lagrangian. In other words, they are a powerful tool to "do QFT without fields". In this talk, we will show how to use such techniques to describe neutrino oscillations. The power of this approach will allow us to derive (I) the PMNS matrix without diagonalizing any...
Primordial black holes (PBHs) are a potential dark matter candidate whose masses can span over many orders of magnitude. If they have masses in the 10^15 − 10^17 g range, they can emit sizeable fluxes of MeV neutrinos through evaporation via Hawking radiation. We explore the possibility of detecting light (non-)rotating PBHs with future neutrino experiments DUNE and THEIA. We will show that...
We will discuss how to systematically study physics beyond the standard model (BSM) in the neutrino experiments within the standard model Effective Field Theory (SMEFT) framework. In this way, the analysis of the data can capture large classes of models, where the new degrees of freedom have masses well above the relevant energy for the experiment. Moreover, it allows to compare several...
The effective number of neutrinos (Neff) is an important cosmological parameter that measures the amount of radiation in the early Universe. Its precise value is necessary to put constraints to models beyond the SM that require extra radiation in the Universe. In the recent years, the progress made in the knowledge about the relevant physical processes that affect the calculation of Neff have...
While photon lines -or monochromatic photons- are known to arise in many dark matter models, neutrino lines are not so common.
In this talk, I will discuss simple dark matter models, whose main indirect detection signature is the production of monochromatic neutrinos. Such features play an important role in indirect dark matter searches because they can be better discriminated against the...
In the next decade, ultra-high-energy neutrinos in the EeV-ZeV energy range will be potentially detected by next-generation neutrino telescopes. Although their primary goals are to observe cosmogenic neutrinos and to gain insight into extreme astrophysical environments, they have the great potential of indirectly probing the nature of dark matter. In this talk, we study the projected...
We explore the possibility of having a fermionic dark matter candidate within $U(1)'$ models for CE$\nu$NS experiments in light of the latest COHERENT data and the current and future dark matter direct detection experiments. A vector-like fermionic dark matter has been introduced which is charged under $U(1)'$ symmetry, naturally stable after spontaneous symmetry breaking. We perform a...
I will discuss several models where the masses of the light active neutrinos are radiatively generated. Mechanisms for generating the SM charged fermion mass hierarchy will also be presented. Some phenomenological aspects, such as Dark matter, charged lepton flavor violation, collider signatures, electron and muon anomalous magnetic moments will be discussed as well.
We perform a systematic analysis of Standard Model extensions with an additional anomaly-free gauge $U(1)$ symmetry, to generate tree-level Dirac neutrino masses. An anomaly-free symmetry demands nontrivial conditions to the charges of the unavoidable new states. An intensive scan was performed, looking for solutions generating neutrino masses by the type-I and type-II tree-level Dirac seesaw...
The Zee model for Dirac neutrinos is one of the simplest models featuring one-loop Dirac neutrino masses. The interactions between the new scalars (two singly-charged fields) and neutrinos induce general neutrino interactions (GNI) which, as a generalisation of the non standard neutrino interactions, constitute an additional tool to probe models beyond the SM like this. In this work, we...
For the first time the scientific community working at the forefront of research in High-Energy, Cosmology and Astroparticle Physics (HECAP) in Latin American have come together to discuss and provide scientific input towards the development of a regional strategy for these fields of knowledge. The strategy, LASF4RI for HECAP, is coordinated with the Highest Authorities of Science and...
The non-zero value of the reactor mixing angle $\theta_{13}$ has ruled out the possibility of $\mu$-$\tau$ symmetry in neutrino mass matrix, there can still be a magic symmetry in neutrino mass matrix. In this context, we explore several classes of two texture zeros such as Class $A$, Class $B$, Class $C$ and Class $D$ in magic neutrino mass matrix and obtain the relation between one unknown...
