In this talk, we introduce a fermionic dark-matter model whose interactions with the Standard Model proceed via vector and scalar mediators. We will show that the model exhibits a rich dark matter phenomenology, while also possessing a constrained parameter space that can be further probed by future experiments.
We studied a Standard Model (SM) extension that provides a bicomponent dark matter scenario. The scalar sector of the SM is extended by adding an inert SU(2) doublet and an inert SU(2) triplet, as well as a SU(2) triplet with hypercharge Y=1 to generate the light neutrino masses through type-II seesaw mechanism. The contribution of the two dark matter candidates to the total dark matter...
The PICO collaboration operates the world’s most sensitive bubble chambers for dark matter searches, setting some of the strongest constraints on spin-dependent WIMP–nucleon interactions. As the traditional WIMP parameter space becomes increasingly constrained, attention is turning toward light and exotic candidates, including fermionic and vector dark matter with absorptive (exothermic)...
SIMP dark matter can be realized through low-energy $SU(N_c)$ effective theories, where dark matter consists of the Goldstone bosons associated with the spontaneous breaking of chiral symmetry, the dark pions. The restoration of this symmetry in the early universe may proceed through a first-order phase transition (FOPT), capable of generating a stochastic background of gravitational waves...
We investigate the nature of the electroweak phase transition (EWPT) in a minimal $Z_6$-symmetric extension of the Standard Model, featuring a fermionic dark matter candidate ($\psi_L,\psi_R$) and a real scalar singlet ($\phi$). Selecting benchmark points that satisfy both the observed dark matter relic density and direct detection constraints, we analyze whether the EWPT is first-order in...
The Two Higgs Doublet Model (2HDM) is one of the simplest and best motivated extensions of the Standard Model (SM), which expands the scalar sector. By introducing a second Higgs doublet, it provides new sources of CP violation that are relevant for baryogenesis and potential explanations for flavor anomalies observed in B-meson decays. In this model, the Yukawa couplings scale with the...
This study presents projection results for the search of non-resonant Higgs boson pair production via vector-boson fusion (VBF) in the boosted $HH \to b\bar{b}b\bar{b}$ final state, using the upgraded ATLAS detector at the High Luminosity LHC (HL-LHC). The analysis extends the latest Run 2 results obtained with 140 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV to HL-LHC conditions...
We perform a feasibility study to probe dark matter (DM) production at the LHC within a $U(1)_L$ scotogenic model. The study is conducted using the Markov Chain Monte Carlo numerical method, considering the viable parameter space of the model allowed by experimental constraints such as neutrino oscillation data, the Higgs to invisible branching fraction, and DM observables. The production of...
Luminosity is a precision measurement, for the CMS experiment. During the Run 3, the uncertainty expected in the luminosity for each year is expected to be $\lesssim 1\%$. However, with the detector aging, some issues with the electronics readout may occur. For luminometers as PLT with redundant measurements, this issues may not affect strongly the central measurement of the luminosity, but...
Búsquedas de física más allá del modelo estándar en el LHC usan de manera frecuente diversos observables para determinar la presencia de señales asociadas a la producción de nuevas partículas. Dentro de estos observables es común encontrar distribuciones de masa reconstruidas, usando las partículas que se producen en las colisiones, en las cuales se esperan encontrar discrepancias en las...
This project, carried out within the ATLAS collaboration, focused on jet substructure studies using the Lund jet plane. Lund plane variables were implemented and used to train graph-based machine learning models for tagging hadronically decaying $W$ bosons and $top$ quarks. The performance of these taggers was systematically evaluated using different Monte Carlo event generators, with...
Jet Classification in high-energy physics is essential for probing fundamental interactions and for searches beyond the Standard Model. In this work, we introduce the Ensemble Model (EM) combining ResNet50 and InceptionV3 architectures for jet tagging, where jets are represented as two-dimensional histograms in the (η, ɸ) plane. This ensemble approach leverages complementary feature extraction...
Este estudio se centra en el desarrollo y aplicación de un algoritmo de agrupación de jets orientado a mejorar la reconstrucción del proceso
𝑝𝑝→𝑍′→𝑏𝑏ˉ en un modelo simplificado que extiende el Modelo Estándar mediante una simetría gauge adicional 𝑈(1)B, asociada al número bariónico calibrado. El objetivo principal es optimizar la identificación experimental del bosón 𝑍′ en detectores como...
The MUonE experiment is designed to extract the hadronic contribution to the electromagnetic coupling in the spacelike region $\Delta \alpha_{had}(t)$ from elastic $e\mu$ scattering. The leading-order hadronic vacuum polarization contribution to the muon $g−2$, $a^{HVP;LO}_{μ}$, can then be obtained from a weighted integral over $\Delta \alpha_{had}(t)$. This, however, requires knowledge of...
The Standard Model (SM) remains the most successful framework for describing particle interactions, yet it leaves key questions unresolved, including possible Lepton Flavor Universality (LFU) violation. Many proposed extensions of the SM predict new particles that couple preferentially to tau leptons, such as S1 and U1 leptoquarks, $ Z'_{B-L}$ bosons, and Type-II Two-Higgs-Doublet Models....
Efficient neutron detection is crucial in areas such as nuclear security, medical physics, and materials research. This work presents the simulation of a thermal neutron detection system using the Geant4 toolkit. The design includes an Americium-Beryllium (AmBe) source as a neutron emitter, a paraffin block for neutron thermalization, a boron-10 enriched graphene film, a scintillating material...
Estudios sugieren que la morfología galáctica está influenciada por su entorno. Sin embargo,la mayoría de estos trabajos se centran en el entorno galáctico inmediato, sin considerar el entorno alrededor del halo de materia oscura que las alberga.
En este trabajo se estudia la relación entre la morfología galáctica, el entorno de su halo de materia oscura y su historia de acreción de masa....
La geometrotermodinámica (GTD), formulada en 2007 por el Dr. Hernando Quevedo, proporciona un marco geométrico para el estudio de los sistemas termodinámicos, permitiendo describir sus propiedades y transiciones de fase mediante estructuras diferenciales invariantes. Este enfoque ha sido aplicado con éxito a diversos campos de la física, mostrando correspondencias profundas entre la curvatura...
We study the possibility of obtaining the Standard Model (SM) of particle physics as an effective theory of a more fundamental one, whose electroweak sector includes two non-universal local U(1) gauge groups, with the chiral anomaly cancellation taking place through an interplay among families. As a result of the spontaneous symmetry breaking, a massive gauge boson Z' arises, which couples...
En esta presentación se abordará el concepto de simetrías globales, locales y gauge. Se discutirá el rompimiento espontaneo de una simetría gauge y su relación con el mecanismo de Higgs en teorías de campo cuántico. Este proceso implica una transición de fase donde el parámetro cuadrático adquiere valores negativos, que puede ser obtenida dinámicamente a través de extensiones supersimétricas...
We investigate the recently proposed gauge symmetry
$SU(3)_C \otimes SU(3)_L \otimes SU(3)_R \otimes U(1)_X$,
which naturally embeds both the Left--Right symmetric model and the 3-3-1 framework as subgroups.
Within this unified setting, we introduce four families of leptons and quarks, and perform a systematic study of their contributions to gauge anomaly cancellation for a general value...
We investigate the lepton-flavor-violating (LFV) process $e^- e^+ \to e^- e^+ e\,\mu$ (with $e=e^\pm$ and $\mu=\mu^\pm$) at future circular electron--positron colliders, probing the effective $\gamma\gamma e\mu$ interaction via photon fusion. Using an Effective Field Theory (EFT) framework that respects current theoretical and experimental constraints, we identify three benchmark points (BMPs)...
En este trabajo se analiza la variación de la masa del pión neutro en función de un campo magnético externo, utilizando el Modelo Estándar dentro de la aproximación del límite del gran N. Para ello se recurre al método de Schwinger en el cálculo del propagador de Feynman, en lugar de los métodos algebraico o de integral de trayectoria, debido a que el propagador relativista parece presentar...
Recent experimental results have reported mild deviations from Standard Model predictions in processes involving two photons in the final state, suggesting the possible presence of high-mass scalar resonances at the few-hundred-GeV scale. We investigate these anomalies within the framework of 3-3-1 models, a well-motivated class of extensions of the Standard Model. Focusing on the most...
The long-standing deviations observed in the ratios R(D) and R(D*), which probe lepton flavor universality in semileptonic B meson decays, have motivated extensive studies of new physics scenarios. In this work, we explore an explanation based on a singlet–triplet vector leptoquark model, featuring both $U_1$ and $U_3$ states. We perform a comprehensive fit to the most recent experimental data...
The class of quark-field phase redefinitions for the standard Cabibbo-Kobayashi-Maskawa phenomenological matrix, from the relevant up-bottom, top-down matrix elements to the top-bottom one, produce a phase value consistent with $\pi/2$. This value is derived from standard-model heavy-quark mass restrictions. These stem from the Yukawa and electroweak sector connections through 1)...
In this talk, We will present the results obtained by our group on the decay of the Higgs boson into a Z boson and a photon in the Standard Model up to two-loop accuracy and within the framework of Radiatively-Driven Natural Supersymmetry.
El estudio de la materia fuertemente interactuante bajo condiciones extremas de temperatura, densidad de espín y vorticidad es fundamental para comprender la dinámica del plasma de quarks y gluones producido en colisiones no-centrales de iones pesados relativistas. En este contexto, se propone un trabajo en curso que extiende el modelo sigma lineal acoplado a quarks mediante la inclusión...
En este trabajo se abordará un estudio fenomenológico de la dispersión elástica coherente neutrino-núcleo (CEvNS) enfocado a la producción de un fermión estéril a través del proceso de up-scattering neutrino-núcleo mediado por un bosón escalar neutro. Se presentará un análisis estadístico preliminar enfocado a determinar posibles restricciones a la masa del fermión estéril y a la constante de...
In non-central collisions, the anisotropic distribution of matter generates orbital angular momentum that induces significant vorticity in the medium, making the dynamics of particles within the QGP dependent not only on temperature and external fields but also on rotational effects. Such phenomena motivate the use of effective descriptions incorporating metrics analogous to curved spacetime,...
We are investigating a theoretical model incorporating an additional symmetry to study general neutrino interactions and their properties, including mass generation. Our ongoing work employs simulations and cross-section analyses to explore event distributions sensitive to these interactions. This research aims to deepen the understanding of neutrino properties and their implications for...
This undergraduate thesis systematically develops the construction of the supersymmetric Lagrangian for gauge theories with $\mathcal{N} = 1$ supersymmetry. Starting from the physical and algebraic foundations of quantum field theory and spacetime symmetries, it introduces the formalism of superspace and superfields as tools to formulate supersymmetric theories. As an application, the...
We explore quantum machine learning (QML) for b-tagging at pT < 20 GeV, where taggeing b-jets from light/c-jets is challenging. We propose classifiers based on variational quantum circuits (VQCs) implemented in PennyLane, compared against classical ML techniques with equivalent parameter counts. The pipeline shares preprocessing with classical methods for fair comparison. We evaluate...
Revisiting semileptonic B decays with tensor mesons in the final state
J. H. Muñoz¹ and J. C. Romero²
1 Departamento de Física, Facultad de Ciencias, Universidad del Tolima
2 Semillero QUARK, Programa de Física, Universidad del Tolima
We revisit the production of tensor mesons in semileptonic B decays within the framework of the nonrelativistic quark model of...
Study of semileptonic $B$ decays with scalar mesons in the final state
J. H. Muñoz$^{1}$ and J. J. Russi$^{2}$
$^{1}$ Departamento de Física, Facultad de Ciencias, Universidad del Tolima
$^{2}$ Semillero QUARK, Programa de Física, Facultad de Ciencias, Universidad del Tolima
We investigate the semileptonic decays $B \to S \, \ell \, \nu_{\ell}$, where $S$ is the $p$-wave scalar meson...
Several studies in heavy-ion collisions suggest that vorticity plays a relevant role in the final observables. In this ongoing work, we address the one-loop radiative correction to the quark–gluon vertex in a rotating medium at finite temperature. The calculation is based on the quark propagator in the presence of vorticity, incorporating thermal effects through the Matsubara formalism....
We investigate the quasinormal modes of several families of higher-dimensional regular black holes arising in gravitational theories that incorporate an infinite tower of higher-curvature corrections to Einstein gravity. Our analysis focuses on how the ringdown phase of gravitational waves for such regular black holes deviates from the predictions of General Relativity. We employ the...
Recent results from several experimental collaborations have reported deviations from the Standard Model predictions in di-photon final tates, suggesting the presence of intermediate scalar resonances above the electroweak scale. The wide variety of such anomalies can be naturally accommodated within extensions of the Standard Model that feature an enlarged scalar sector. In particular,...
Experimental measurements of this decay, made by the LHCb and CMS, show a deviation from the predictions of the Standard Model. We propose that this discrepancy can be explained by the existence of a dark sector that interacts with ordinary matter through a new mediator boson Z’.
Gravitational particle production in cosmology is a mechanism through which particles of different natures are produced during the very early universe. It is a general mechanism that explains how the universe became populated with the particles of the Standard Model after cosmic inflation and may also account for the origin of dark matter. In this work, we study the non-perturbative production...
We investigate the original Scotogenic model proposed by E. Ma, focusing on its radiative mechanism for neutrino mass generation. In particular, we compute the one-loop neutrino mass matrix, regularized through the cut-off method, and express the resulting masses in terms of the Yukawa couplings and scalar potential parameters. Using representative values commonly adopted in the literature, we...
En el centro de la mayoría de las galaxias observadas se encuentran agujeros negros supermasivos (SMBHs, por sus siglas en inglés Super Massive Black Holes), con masas que van desde millones hasta miles de millones de veces la del Sol. Su presencia y actividad influyen decisivamente en la evolución y dinámica galáctica. Estos SMBHs liberan enormes cantidades de energía por medio de procesos de...
El proyecto consiste en el desarrollo de un contador de centelleo sencillo y de bajo costo, basado en un microcontrolador Arduino y componentes accesibles, para la detección de muones atmosféricos provenientes de rayos cósmicos. El sistema se compone de un material centelleador plástico acoplado a un fotodetector (SiPM o PMT de bajo voltaje), cuya señal es amplificada mediante la electrónica...
En el marco de la física de altas energías, la clasificación de las vastas cantidades de partículas subatómicas producidas en colisiones como las del Gran Colisionador de Hadrones (LHC) del CERN es un desafío computacional central. Los métodos de análisis tradicionales son a menudo lentos y exigen hardware especializado, lo que limita su accesibilidad. Este proyecto de investigación en curso...
We develop a model-independent framework to construct quark--lepton families in flipped trinification, $SU(3)_C\times SU(3)_L\times SU(3)_R\times U(1)_X$, for arbitrary charge embedding. The approach identifies and classifies Irreducible Anomaly-Free Sets (IAFS)---minimal fermion multiplet combinations that cancel, by themselves, all gauge and mixed anomalies: $[SU(3)_{L,R}]^3$,...
Los fotomultiplicadores son dispositivos de detección altamente sensibles que permiten medir con gran precisión niveles bajos de radiación electromagnética, en particular en el rango óptico. En este proyecto se propone la caracterización experimental de un fotomultiplicador comercial, utilizando como fuente de radiación láseres rojos de bajo costo (625–740 nm).
Se estudiarán parámetros como...
We present a novel technique to determine the charge of b-tagged small-cone jets in the CMS experiment. While current heavy-flavour tagging algorithms are charge-agnostic, the ability to distinguish between b and anti-b (as well as c and anti-c) jets is essential for several physics analyses, including Higgs and di-Higgs production studies. The proposed method leverages the Particle...
Jet tagging, a classification task crucial for new physics searches at the LHC, has been evolved by deep learning. This work presents a comparative study of two state-of-the-art architectures, ParticleNet (a dynamic graph neural network) and Particle Transformer (ParT), which operate on permutation-invariant particle cloud representations of jets. We present a comparative analysis across...
Coherent elastic neutrino–nucleus scattering (CEνNS), predicted by the Standard Model, occurs when the momentum transfer satisfies $qR \leq 1$, causing the entire nucleus to respond coherently and the cross section to scale approximately with $N^2$ (the number of neutrons). The CONUS+ experiment, located at the Leibstadt Nuclear Power Plant (Switzerland) and employing high-purity germanium...
In this work, we propose an extension to the Standard Model (SM) by adding a new $SU(2)$ gauge symmetry, which is spontaneously broken by an extended scalar sector. Under this new symmetry, the left-handed fields of the SM remain invariant, while the right-handed ones form a doublet together with a new, heavier partner. In addition, a new fermionic field $S_R$ is introduced, which transforms...
Geant4 es una herramienta de software que permite la simulación del paso de la partículas mediante materiales organizados en una geometría compleja, en el cual las interacciones débiles se limitan a la desintegración de partículas y la captura de electrones por los núcleos [1]. Los neutrinos son partículas fermionicas con una sección de interacción muy baja, que se producen en la...
Neutrinos produced in core-collapse supernovae (CCSNe) offer a valuable probe for investigating the Earth's density profile by studying how Earth's matter influences their oscillations. Nonetheless, recent studies suggest that the Earth matter effects on CCSN neutrinos are expected to be small and difficult to observe with existing or forthcoming neutrino detectors, primarily due to the...
En los últimos años las simulaciones numéricas han jugado un papel muy importante como complemento a las pruebas a las cuales es sometida constantemente la Relatividad General. Un caso particular es la Relatividad Numérica, con la cual se dificultaría la comprensión de fenómenos astrofísicos como la colisión de agujeros negros. Desde la astrofísica también se puede estudiar como planetas y...
This work presents the simulation and study of a three-dimensional scintillator bar detector for the analysis of 100 MeV electrons, using the GEANT4 toolkit. The detector design consists of a segmented array of scintillator cubes, each coupled to a wavelength-shifting (WLS) optical fiber and a silicon photomultiplier (SiPM). This computational study is complemented by an ongoing...
Se estudia el espacio paramétrico de neutrinos, obteniendo algunos limites en las masas de los neutrinos en el decaimiento doble beta sin neutrinos, en escenarios de cero, uno y dos neutrinos estériles, mediante los últimos datos experimentales de neutrinos y una conjunción entre las restricciones de decaimiento doble beta sin neutrinos, decaimiento beta del Tritio (KATRIN) y las observaciones...
Stellar winds are mechanisms through which stars lose mass from their outer layers. Although the underlying physical processes are not yet fully understood, stellar winds can strongly influence stellar evolution and determine the final fate of a star. In this work, we investigate stripped helium stars, i.e., stars that have lost their hydrogen-rich envelopes due to binary interaction. Our aim...
This project presents the design and experimental development of a Cherenkov detector for atmospheric muons that incorporates solid-phase colloids to enhance detection efficiency. The detector medium consists of a TiO₂ nanoparticle suspension (average particle size ≈ 298 nm) dispersed in a glycerin–deionized water mixture at concentrations above 0.5 %, achieving a refractive index greater than...
We analyze the constraint structure of the Proca field with gauge symmetry within the framework of the Hamilton–Jacobi formalism. The complete set of Hamiltonians generating the system’s dynamics is derived from Frobenius’ integrability conditions, together with the corresponding characteristic equations. As generators of canonical transformations, the Hamiltonians are naturally related to the...
In this work, we analyze the internal structure of neutron stars using hybrid equations of state that combine hadronic and quark degrees of free-dom within a unified framework. The stellar crust is described through the Togashi model, which ensures thermodynamic consistency across the nuclear saturation regime, while the nucleonic region follows the Prakash formulation for 3-stable matter. The...
En el contexto del sistema de calibración del sensor de fotones del detector lejano del proyecto DUNE se requiere realizar la implementación de una tecnología innovadora llamada Power over Fiber la cual, a grandes rasgos, consiste en transmitir energía proporcionada por un láser de alta potencia a través de fibra óptica.
Para cumplir con este objetivo es necesario contar con fibras ópticas...
We investigate the potential to search for dark matter within a simplified model that introduces a new scalar/vector resonance connecting the Standard Model (SM) to the dark sector composed by a Dirac fermionic dark matter particle. This mediator couples to SM vector bosons, including gluons, giving rise to novel Vector Boson Fusion (VBF) topologies. These allow for the exploration of such...
Los modelos partículas de materia oscura en la que estas se producen a través del mecanismo freeze-in se conocen como Feebly Interacting Massive Particles (FIMPs), y han sido estudiadas ampliamente en el paradigma de la cosmología estándar, sin embargo, los parámetros cosmológicos pueden variarse en tanto no se alteren las mediciones, dando lugar a modelos cosmológicos no estándar. Este...
Con una masa de 106 MeV/c2 y una vida media de 2.2 µs, los muones son las partículas más abundantes a nivel del mar, donde llegan con una energía media de 4 MeV, provenientes del resultado de interacciones de protones y núcleos pesados (rayos cósmicos primarios) con la atmósfera terrestre. Con el objetivo de reproducir de manera realista la interacción de estos muones en un plástico...
The rare decay ( B^+ \to K^+ \nu\bar{\nu} ) offers a powerful window into physics beyond the Standard Model (SM) due to its theoretical cleanliness and sensitivity to new light invisible particles. Within the SM, this flavor-changing neutral current (FCNC) process occurs only at loop level and it is strongly suppressed by the Glashow–Iliopoulos–Maiani (GIM) mechanism. Its final state...
El 4 de julio de 2012, las colaboraciones ATLAS y CMS del LHC anunciaron el descubrimiento de una nueva partícula con una masa cercana a 125 GeV, cuyas propiedades observadas resultaban consistentes con las del bosón de Higgs del SM. Este hallazgo abrió un extenso programa experimental orientado a estudiar en detalle sus propiedades y determinar su verdadera naturaleza. Esta charla presenta...
Classical simulation of neutrino oscillations faces multiple computational challenges such as simulating collective neutrino systems and incorporating complex quantum effects (correlations in neutrino-neutrino interactions, decoherence, matter effects, etc.). Quantum computing presents an alternative to overcome these challenges, because of its inherent quantum properties it can perform actual...
En 1964, los físicos Cronin y Fitch descubrieron una violación a la simetría CP en el decaimiento de Kaones neutros, desde entonces se ha encontrado que la violación CP aparece en otros mesones, en 2001 se evidencio violación CP en mesones B, y en 2011 se evidenció el hallazgo en los mesones D. Nuestro estudio tiene como objetivo realizar un análisis a la violación de esta simetría en el...
La línea de 21 cm del hidrógeno neutro es una de las herramientas más prometedoras para explorar el universo temprano, permite, entre muchas cosas, estudiar algunas etapas como las Edades Oscuras, el Amanecer Cósmico y la Época de Reionización (EoR). Sin embargo, su detección directa continúa siendo un desafío debido a la presencia de contaminantes astrofísicos intensos, efectos instrumentales...
La muografía, técnica basada en la detección de muones atmosféricos provenientes del espacio exterior, se ha consolidado como una herramienta innovadora para la exploración no invasiva de la morfología de estructuras u objetos. Este desarrollo ha impulsado la búsqueda de materiales, configuraciones y sistemas de detección que permiten medir la intensidad, dirección y la energía de los muones....
La retinopatía diabética (RD) es una de las principales causas de ceguera a nivel mundial y requiere una detección temprana precisa para evitar complicaciones irreversibles. En este contexto, el presente trabajo presenta el diseño e implementación de un sistema automatizado de apoyo diagnóstico para la RD, que combina la segmentación de imágenes de fondo de ojo mediante redes neuronales, con...
La materia oscura representa cerca del 26 % del contenido del universo, pero su naturaleza sigue siendo desconocida debido a su nula interacción electromagnética. Entre los distintos enfoques de búsqueda, la detección indirecta busca señales en los productos de aniquilación o decaimiento de partículas de materia oscura, siendo los rayos gamma uno de los canales más prometedores. El flujo...
Primordial black holes (PBHs) are an attractive alternative in the absence of direct detection of dark matter particles. Unlike exotic candidates, PBHs are solutions of general relativity that could have originated in the early universe from density fluctuations. This talk will present a concise overview of the current constraints on their viability as a component of dark matter. The most...
Large-scale structures in the universe can be studied through N bodies interacting gravitationally. In this work, we approximate this process using a quantum dust fluid in one spatial dimension, described by the Schrödinger-Poisson equations. The temporal evolution of the system is calculated using B-splines within the Crank-Nicolson propagator implemented in a predictor-corrector scheme....
The evolution of domain wall networks is essential to understanding our cosmological history. We will consider the scenery after which the degeneracy of the vacuum is broken, and bubbles of the false vacuum will start to collapse. I will discuss the interesting dynamics in these processes, caustics formation, and the fascinating connection to Catastrophe theory and geometric optics through...
An analytic and numerical systematic study of the neutrino mass matrix Mν with one texture zero in a basis where the charged leptons are diagonal, and under the assumption that neutrinos are Dirac particles, is carried through in detail. Our study is done without any approximation, first analytically and then numerically. Current neutrino oscillation data are used in our calculations. The...
Las desigualdades de Leggett-Garg (LG), derivadas bajo la noción de realismo macroscópico (RM), son un análogo temporal de las desigualdades de Bell, y surgen a partir de nuestras intuiciones sobre el comportamiento de sistemas clásicos. Aquí, estas desigualdades se aplican en el contexto de los neutrinos en campos magnéticos, lo cual representa una buena configuración para estudiar los...
The observation of charged lepton flavor violation would be a clear signal of new physics. In this work, we study flavor-violating three-body $\tau$ decays induced by the scalar leptoquarks $R_2$ and $S_1$. We consider a parameter space constrained by the radiative processes $\Delta a_\mu$ and $\ell_i \to \ell_n \gamma$, focusing on flavor structures where only the top or charm quark...
We present a comprehensive theoretical framework for spectral boundary conditions (SBC) in two-dimensional conformal field theory, with particular focus on free boson models with boundaries. Using gamma-matrix formalism, we introduce a boundary helicity operator β = γ₅∂_σ and analyze its eigenvalue spectrum to classify boundary conditions. We investigate three distinct linear homogeneous...
We investigate constraints on a hypothetical light gauge boson, $Z'$, using recent CE$\nu\mathcal{N}$S measurements from the CONUS+ reactor experiment. The presence of such a $Z'$ would induce additional neutrino-quark interactions beyond the Standard Model. To explore this possibility, we perform both a $\chi^2$ minimization and a binned Poisson likelihood analysis. Systematic uncertainties...
We study constraints on non-standard neutrino interactions (NSI) using recent CE$\nu\mathcal{N}$S measurements from the CONUS+ reactor experiments. A dedicated statistical analysis is performed by constructing both a $\chi^2$ estimator and a binned Poisson likelihood, with exclusion regions derived at 90\% C.L. for the relevant NSI couplings. By combining $\chi^2$ minimization with likelihood...
En esta presentación se abordará la producción y emisión de radiación térmica en colisiones de iones pesados relativistas (RHIC y LHC), destacando los métodos de medición empleados en el estudio del plasma de quarks y gluones (QGP). Se introducirán las propiedades fundamentales del QGP, un estado de la materia recreado en colisionadores que alcanza temperaturas y densidades extremas,...
