In this talk I will discuss some recent developments concerning scenarios of multi-component scalar dark matter based on a single ZN symmetry.
The Schwinger-Dyson equations (DSE) were obtained from a mass functional generation $M(p)$ for a fermion propagator. The DSE are obtained, which are analogous to the Euler-Lagrange equations in Quantum field theory (QFT), since they are the equations of motion of the Green's functions . The DSE's are an infinite set of integral equations coupled to each other and it is only possible to solve...
We present a detailed study of a proposed model to explain the experimental hints of new physics in B meson decays within the frameork of the Pati-Salam unification. The model is based on the local gauge group SU$(4)_L\otimes$SU$(4)_R \otimes$SU$(2)_L \otimes$U$(1)^\prime$ and part of its gauge bosons are (3,1)2/3 vector leptoquarks. The key feature of the model is that SU$(4)_R$ is broken at...
I will talk about the Standard Model scalar coupling ($\lambda$) evolution in a particular QCD resummation scheme, where the QCD coupling becomes infrared finite due to the
presence of a dynamically generated gluon mass, leading to the existence of a non-perturbative infrared fixed point. We discuss how this scheme can be
fixed taking recourse to phenomenological considerations in the...
We present a canonical quantization for Chern-Simons
on the Null Plane coordinates using the Dirac procedure and the
Faddeev-Jackiw procedure. The constraint structure when using
null-plane coordinates is considered and the gauge generators are
derivated.
Se construye el algebra de Líe del grupo de Poincare para extenderlo a álgebras de Lie graduada adicionando generadores fermionicos. Se estudiarán representaciones irreducibles minimales de estas álgebras y los respectivos súpercampos para construir densidades lagrangianas invariantes bajo las álgebras graduadas.
We systematically review how anomaly-free 3-3-1 models, with and without exotic electric charges, can be constructed using as a basis closed sets of fermions that include each of the particles and antiparticles of all electrically charged fields. Our analysis reproduces not only the models known in the literature, but also shows the existence of several more independent models for one and...
The 10 ton liquid argon (LAr) scintillation detector Coherent CAPTAIN-
Mills, at the LANSCE facility of the Los Alamos National Laboratory,
sits at a distance of 23 m from the core of the Lujan Center spallation
source, which is a copious source of neutrinos from stopped pions, as
well as, possibly, new particles belonging to a hypothetical Dark Sector
of particle physics. Besides...
The deep underground neutrino experiment (DUNE) is a neutrino observatory and nucleon decay detector under construction, designed to give answers to modern physics problems like: the neutrino hierarchy and matter-antimatter asymmetry. To do that, in DUNE will be possible to perform precise measurements of neutrino oscillation parameters, in addition DUNE will be able to detect and measure...
The NOvA experiment studies the disappearance of muon (anti)neutrinos and the appearance of electron (anti)neutrinos to measure the parameters governing the oscillation of neutrinos at the so-called atmospheric sector. Thanks to the long distance travelled by the neutrinos through the earth, NOvA can also explore the effects of possible Non-Standard Interactions with matter. Here I present the...
Modeling neutrino final state interactions with target nuclei within neutrino detectors is an open research field. Experiments such as MINERvA, T2K and NOvA found discrepancies on their simulations with their data, which implies that the current theoretical models are not encoding the full physics of the interactions. In particular, long-baseline neutrino oscillation experiments are currently...
Recent results from neutrino experiments studying neutrino interactions show that final state interactions are not fully explained by current theoretical models. In this regard, pion production in final state interactions is at the center of the discrepancies between theoretical models and experimental data. Hence, a characterization based on data of pion production and interactions in...
Upcoming hardware updates to the ATLAS detector will allow for jet finding algorithms similar to those used offline to be implemented at the lowest level of the trigger. This will allow to increase the coherence between the data selected in the analyses and those selected by the trigger. Motivated by the fact that the anti-kT is one of the most commonly used jet finding algorithms in the ATLAS...
The stages of the assembly process and preliminary testing of four-chip silicon modules (CROCs) designed to detect charged particles in the TFPX region of the Inner tracker at CMS experiment within the framework of CERN High Luminosity updates are detailed. These stages correspond to assembly using an Aerotech gantry, positioning data collection based on the angular opening and the average...
In the context of high precision electron polarimetry for future e+e- colliders, a tool to precisely monitor laser polarisation in real time to the per-mille level is needed. We propose to investigate the capabilities of photo-elastic modulators to that purpose
La búsqueda de materia oscura en aceleradores de partículas es un tema del cual se tiene muy poco material divulgativo, el objetivo de este proyecto es crear una estrategia de divulgación de este tema enfocada a personas sin formación en áreas afines a la astrofísica. Se realizó un estudio del tema y se buscaron referencias para determinar cuál debía ser el contenido, en qué orden se debía...
- Identificación de problemáticas
- Definición de indicadores, calidad de los datos existentes
- Acciones afirmativas en DEI
- Voces desde el sur global: ¿cómo se vive el trabajar en HECAP desde Colombia?
- Género en ciencia
- Hablemos de interseccionalidad
- Vida estudiantil y postdoctoral: retos y perspectivas
We revisit a two-component dark matter model in which the dark matter particles are a singlet fermion (ψ) and a singlet scalar (S), both stabilized by a single Z4 symmetry. The model is remarkably simple, with its phenomenology determined by just five parameters: the two dark matter masses and three dimensionless couplings. In fact, S interacts with the Standard Model particles via the usual...
A model of gauged lepton number with scotogenic Dirac neutrino masses and dark baryogenesis
We propose a model with a multicomponent and multiflavor dark matter which allows the realization of an effective operator for Dirac neutrino masses. Furthermore, it has an extra Abelian gauge symmetry that is spontaneously broken and generates masses for particles in the dark sector and it is responsible for the stablity of dark matter candidates. We explore the parameter space of the model...
Rotations of an axion field in field space provide a natural origin for an era of kination domination in the early universe. We investigate how this cosmological scenario affects the spectrum of possible primordial gravitational waves, its implication for structure formation and relieving the Hubble tension.
In recent years the multi-component scalar dark matter models with discrete symmetries $\mathbb{Z}_N$ have been widely studied in the literature. Among them, the $\mathbb{Z}_5$ model proposes two complex fields that transform as singlets under the Standard Model gauge group. The scalar potential brings along with eleven free parameters that must be restricted. In that sense, the primary...
Synopsis In the standard cosmological scenario, it is proposed a Universe dominated by radiation just after the inflationary phase and prior to Big Bang Nucleosynthesis (BBN) but actually, there is not much observational information supporting this hypothesis. This research project is intended to take advantage of this gap in our knowledge of cosmic history to modify the post-inflationary...
We present an analysis of the mechanisms of dark matter production in the early universe. There are many different models that try to explain such production. In this short talk we focus on three of these mechanisms. The first and the most recognized is the Weakly Interacting Massive Particles or WIMP model, which we work on by applying the Boltzmann equation to study the behavior of the WIMP...
En el presente trabajo se estudian las generalidades de la teoría conforme (CFT) como, por ejemplo, el algebra conforme, las funciones de correlación, los límites de unitaridad y la expansión del producto operador (OPE). Elementos con los que se abordaran argumentos teóricos, incluyendo el cómo establecer limites en las dimensiones del operador escalar en cuatro dimensiones de las CFT´s....
En este trabajo se estudian las restricciones físicas impuestas por la teoría de la relatividad general de Einstein para la existencia de soluciones tipo agujero de gusano. Se hace un análisis partiendo de las condiciones energéticas usadas comúnmente en relatividad general, junto con las restricciones impuestas por la ecuación de Raychaudhuri [1], relacionada también con las condiciones...
En este trabajo, se estudia la expansión acelerada tardía del universo en un modelo de gravitación modificada tipo f (R, G) con acoplamiento de un campo escalar al invariante de Gauss-Bonnet. En este sentido se consideran tres propuestas para f(R) del tipo exponencial en el escalar de curvatura R. En primera instancia se obtienen las ecuaciones generales de movimiento asociadas al modelo...
Los neutrones son partículas subatómicas que conforman parte de la componente hadrónica de los rayos cósmicos que ingresan a la Tierra. Su detección y caracterización es de particular interés para el estudio de decrecimientos de Forbush producidos por la emisión de masa coronal que altera el flujo de rayos cósmicos. El decrecimiento de Forbush se evidencia mayoritariamente en energías...
Aunque el fenómeno de oscilación de neutrinos es bien conocido y estudiado, el acercamiento estándar desde la mecánica cuántica incluye algunos problemas, por ejemplo, en el cálculo de la probabilidad de oscilación. Estudiando la oscilación desde la Teoría Cuántica de Campos se busca ofrecer un mejor panorama en cuanto a estos problemas y plantear la posibilidad de organizar y dar solución a...
El objetivo principal es exponer los límites de la mecánica cuántica con ayuda de la desigualdad de Leggett-Garg, utilizando el fenómeno de oscilación de neutrinos como mediador entre los dos, el cual se fundamenta en el cambio de estado de sabor, fenómeno que corresponde a una superposición coherente de los estados de masa. Se propone estudiar la violación de la desigualdad de Leggett-Garg...
We consider a simplified model where a W' boson is added to the standard model with negligible couplings to quarks, but generic couplings to leptons and electroweak bosons. We study the implications of such a model for LHC searches. Consequently, we propose an LHC search through the vector boson fusion topology which would have sensitivity for such a new particle with the current proton-proton...
The $R_{D^{(\ast)}}$ anomaly is one of the most intriguing experimental results in particle physics. Experiments as BaBar, Belle and LHCb have measured a consistent tension with the standard model. In this work we study a consequence of different solutions to this tension as a sequential $\mathrm{W}'$ boson, EFT and leptoquark. Such models, are not only able to explain the $R_{D^{(\ast)}}$...
Particle tagger methods are a powerful tool to filter unwanted data and improve the final results of the experiment. In this case, the performance of different tagger methods of W bosons in collision events of the ATLAS experiment will be studied, taking special attention to the methods based on the so-called Lund Jet Plane, which according to preliminary results presents a better performance...
In recent years, the observations reported by LHCb, Babar, and Belle experiments of the apparent anomalies in B-meson decays, together with the possible anomaly on the magnetic angular momentum of muons reported by the Muon $g-2$ experiment at Fermilab, indicate that, perhaps, lepton flavour universality is violated in the SM, in turn being a window to search new physics.
Of the new models...
The strength of the Higgs boson's coupling with other fermions and bosons is extensively studied during the first two LHC runs. In this work, the production of the Higgs boson, namely, Vector Boson Fusion (VBF) is studied. VBF is the process of two quarks, each of which emits a vector boson, W or Z boson, which then merge to create a Higgs boson. Machine learning (ML) models are built to...
This work studies the improvement that could be obtained by applying machine learning techniques to an ongoing event selection.
This work uses jet-vertex tagger (JVT) and forward jet-vertex-tagger (fJVT) which discriminate pile-up events from high scattering processes coming from the first vertex and thus calibrate these algorithms by determining the scaling factors of their efficiency with their corresponding uncertainties using data from the ATLAS experiment.
Columnar analysis is a paradigm that describes the way the user writes the analysis application that is best described in contrast to the the traditional paradigm in high-energy particle physics (HEP) of using an event loop. Coffea is a prototype package for pulling together all the typical needs of a high-energy collider physics (HEP) analysis. In this talk I will provide an introduction to...
Very recently the LHCb experiment released the first measurement of the ratio $R(\Lambda_c)$. Moreover, the BABAR experiment reported a new result of the leptonic decay ratio of Upsilon meson $\Upsilon(3S)$, namely, $R_{\Upsilon(3S)}$. Both measurements are below their corresponding Standard Model predictions (deficit), deviating by \sim 1.1\sigma∼1.1σ and \sim 1.8\sigma∼1.8σ, respectively. In...
There is no Bc annihilation decay experimentally observed to date. The B_c -> Phi K+ decay can proceed via annihilation of anti-b and c quarks into a W intermediate boson or, alternatively, involving final-state rescattering effects. Observation of the B_c -> Phi K+ decay will provide a new insight on the B_c meson properties and will allow a new independent determination of the V_cb CKM...
There is no unique way of considering which one is the topology supposed to be the dominant one in decays such as $D^+_s \rightarrow K^+K^-K^+$ or $D^+ \rightarrow K^+K^-K^+$. There could be relevant contributions coming from either the radiation topology or the annihilation one. Meanwhile, there are extensive analyses of the annihilation topologies considering the weak vertex as a constant,...
We present the first observation of the $B^{+}$ meson production suppression in high-multiplicity respect to low multiplicity pPb collisions at $\sqrt{s_{NN}} = 8.16$ TeV with data collected by the CMS detector during 2016 and corresponding to an integrated luminosity of 175 nb$^{-1}$. The measurement uses exclusive decay channel $B^{+}\rightarrow J/\psi \ K^{+}$. The inclusive results show a...
Multiple fits were done with the run 2 of the LHCb data, to extract signal of
$B_s^0 \rightarrow \phi \phi \phi$ events via charmonia resonances. First, 3D
fits in the bins of the $B_s^0$ invariant mass were computed to get the
estimated number of true $\phi \phi \phi$ events. With a new histogram with the
resulting signal for each bin, a fit was applied, to extract the $B_s^0$
signal....
This work explores a holographic proposal to describe light nuclide spectroscopy by considering extensions to the well-known bottom-up AdS/QCD proposals, the hardwall and softwall models. We also propose an alternative description inspired by the Woods-Saxon potential. We find the static dilaton associated with this potential in this Wood-Saxon-like model. We compute the nuclide spectra...
A Peccei-Quinn~(PQ) symmetry is proposed, in order to generate in the standard Model~(SM) quark sector a realistic mass matrix ansatz with five texture-zeros. Limiting our analysis to Hermitian mass matrices we show that this requires a minimum of 4 Higgs doublets. This model allows assigning values close to 1 for several Yukawa couplings, giving insight into the origin of the mass scales in...
The biggest particle accelerators quantify the number of interactions with luminosity, the proportionality factor between the number of events per second and the cross section. For Run 3, LHCb experiment uses Allen software for High Level Trigger 1 (HLT1) developed on Graphics Processing Units (GPUs). The implementation of new trigger lines for luminosity measurements requires the development...
This work presents the selection of the $D^{+}\rightarrow K{-}K{+}K{+}$ candidates and progress in the amplitude analysis of this decay using the Multi-meson model (Triple-M), a model based on an effective chiral Lagrangian. The study is based on a sample of $pp$-collision data, collected at a centre-of-mass energy of 13 TeV with the LHCb detector between 2016 and 2018. The results of the...
Recent measurements on semi-leptonic decays of the B meson suggest a violation of lepton universality. This goes against the Standard Model prediction where none of its interactions distinguish lepton flavours. A posible explanation for this anomaly lies in the context of Beyond Standard Models. In this talk a model with new physics will be presented, which makes use of leptoquarks -...
In this work, we show a study of the generation of neutrino masses is carried out from the seesaw type II Mechanism for Dirac neutrinos. These mechanisms not only explain the mass of the neutrino but also its small value compared to charged quarks and leptons. Therefore, a model is proposed to obtain the small neutrino masses by extending the visible content of the Standard Model (SM) with $S$...
The type-I Dirac seesaw extension is made to the DFSZ axion model, where light active neutrinos are Dirac particles and acquire mass through the canonical seesaw mechanism after the Peccei-Quinn and electroweak symmetry breaking, finding that neutrino mass can be approximated to $m_{\nu}≈vf_{a}/Λ_{UV}$, result which relates the three energy scales involved in the model: the mass of the heavy...
