XII Latin American Symposium on High Energy Physics

Session

Poster Session

27 Nov 2018, 16:50

Sala SUM, Centenario Building (Sociales) (PUCP)

77. ADS BLACK-HOLE SOLUTIONS IN EINSTEIN-GAUSS-BONNET HIGHER ORDER DERIVATIVE GRAVITY

Mr Andrés Aarón Argandoña Villavicencio (GFT-UNMSM)

Poster (Theory)

In recent years, black holes solutions in Anti-de Sitter (AdS) spaces have attracted a great deal of attention. This is partly due to the success of AdS/CFT correspondence, which has the holographic entanglement entropy (EE) proposed by Ryu and Takayanagi as one of its most important applications

This is why, as the first part of a project that intends to study EE in higher order derivative...

61. An alternative explanation to accelerating Universe without $\Lambda$ in concordance with the last $H_0$ measured value

Joaquin Sureda Hernandez (Pontificia Universidad Catolica de Chile)

Cosmology

Poster (Theory)

We perform an MCMC analysis with the most updated SN-Ia catalog using an alternative cosmological model named Delta Gravity. This model is based on a new Einstein-Hilbert action based on a new symmetry symbolized as $\tilde{\delta}$. This theory predicts an accelerating Universe without the need to introduce a $\Lambda$ by hand in the equations.

The equations of motion that describe the...

41. An overview on B anomalies

Mr jonathan cardozo (Universidad del Tolima)

Poster (Theory)

In this work we present a review of the anomalies generated by the transition $b \rightarrow c l \nu$, where $l=e, \mu, \tau$. Specifically anomalies $R(D)$, $R(D^*)$, $R(J/\psi)$ are studied, including all possible four-Fermi operators in the effective Lagrangian that induce new physics to these ratios.

67. An updated version of the electroweak right-handed neutrinos and new Higgs signals at LHC

Mr Moises Zeleny Mora (Facultad de Ciencias Físico Matemáticas Benemérita Universidad Autónoma de Puebla)

Poster (Theory)

We explore the Higgs sector phenomenology in the standard model extension including one complex singlet Higgs field (SM+1CS), which implies massness right-handed neutrinos ($\sim O(M_{Z_0})$).
All scales arise from spontaneous symmetry breaking (SSB). The scalar spectrum includes two neutral CP-even states ($h$ and $H$, with $m_h < m_H$ ) and a neutral CP-odd state ($\sigma$) that can be...

70. Approximated three-flavor neutrino oscillation probabilities in matter for a generic decoherence matrix

Mr Juan Carlos Carrasco Martínez (Pontificia Universidad Católica del Perú)

Poster (Theory)

The quantum decoherence phenomena has been largely studied as a sub-leading effect within the neutrino oscillation framework. From the analytical point of view, two-flavor neutrino oscillation probabilities in matter have been derived for a generic decoherence matrix. The aim of this work is, assuming a generic decoherence matrix (i.e. with off-diagonal elements non - zero) to develop...

59. Charged rotating BTZ geometry

Cristian Rivera

Poster (Theory)

We review the topological (2+1) black hole solution proposed by Bañados, Teitelboim and Zanelli (BTZ) for the rotating and charged case, emphasizing the wormhole solution of the above BTZ configuration. Recent work in holography and entanglement related with implementations of quantum teleportation protocols in the ER=EPR context and in more general cases showed that a further study of the BTZ...

29. Coexisting vacua in the CP conserving 2HDM: an one-loop study

Adriano Cherchiglia (Universidade Federal do ABC)

Beyond the Standard Model

Poster (Theory)

The Two-Higgs-Doublet model (2HDM) is a simple and viable extension of the Standard Model with a scalar potential complex enough that two minima may coexist. In this contribution we investigate if the procedure to identify our vacuum as the global minimum by tree-level formulas carries over to the one-loop corrected potential. In the CP-conserving case, we identify two distinct types of...

51. Decays $A \to Z\gamma\gamma$ and $\phi \to Z\gamma\gamma$ ($\phi=h,H$) in two-Higgs doublet models

Mr Ricardo Sánchez Vélez (Benemérita Universidad Autónoma de Puebla)

Poster (Theory)

The one-loop contributions to the decays of the CP-odd and CP-even scalar bosons $A\to Z\gamma\gamma$ and $\phi\to Z\gamma\gamma$ ($\phi=h,H$) are calculated within the framework of CP-conserving THDMs, where they are induced by box and reducible Feynman diagrams. The behavior of the corresponding branching ratios are then analyzed within the type-II THDM in a region of the parameter space...

42. Developing of a muon tomography system for the study of geological objects

Dr César M. Castromonte F. (National University of Engineering)

Poster (Experiment)

This work describes the initial steps to develop and build a muon scattering tomography system to investigate the space and time changes in the internal density distribution inside geological structures. As a start, a very detailed simulation chain to calculate the cosmic ray background flux is being developed in order to estimate the most convenient places and the exposure time of the muon...

21. Distributed acquisition logic for extended detector systems

Adrián Pablo José Sedoski Croce (ITeDA (CNEA, CONICET, UNSAM))

Poster (Experiment)

The Pierre Auger Observatory is designed to study cosmic ray showers at the
highest energy using a hybrid approach by combining complementary detection
techniques to study the same phenomena. One of these detectors is the
Surface Detector Array, a regular array of 1660 water Cherenkov detectors
distributed in an area of ~3000 km^2.

The surface detector has a centralized, hierarchical event...

49. Earthquake Studies Using a LAGO Detector in Ecuador

Edgar Fernando Carrera Jarrin (Universidad San Francisco de Quito (EC))

Poster (Experiment)

Several studies have suggested the possibility of an interrelation between the occurrence of earthquakes and local disturbances in the geomagnetic field that could translate into an influence on the local cosmic ray flux at ground level. On April 16, 2016, Ecuador suffered one of the strongest earthquakes in its history. One of the Latin American Giant Observatory (LAGO) water Cherenkov...

73. General Theory of Relativity under the Monad Formalism and its comparison with the ADM approach

Alexis Tremolada (Universidad Nacional Mayor de San Marcos)

Poster (Theory)

The present work exposes the Monad Formalism, which allows to characterize the frames of reference by tensor magnitudes, called physical-geometric tensors, and their relations with the metric tensor of space-time in the General Theory of Relativity (GTR). The invariances of the Monad Formalism are analyzed and the 3 + 1 foliation of the space-time is developed, which allows the Hamiltonian...

85. Higgs and Z' portals in the Dark Matter indirect detection

Mr Jose Halim Montes de Oca Yemha (UNAM), Ricardo Gaitán (Universidad Nacional Autónoma de México), Roberto Martinez (Universidad Nacional de Colombia)

Poster (Theory)

In this work we study the contributions to the Dark Matter indirect detection which arising from additional neutral scalar and neutral gauge vector boson. The Dark Matter candidate is assumed to be an extra singlet scalar field. We find interesting scenarios for the additional contributions to the Dark Matter indirect observation.

65. Linking LFV Higgs decays $h\rightarrow l_i l_j$ with CP violation in multi-scalar models

Dr O. Félix-Beltrán (Benemérita universidad Autónoma de Puebla)

Poster (Theory)

The study of LFV decays of the Higgs boson, $h\to \ell_i \ell_j$, has become an active research subject both from the experimental and theoretical points of view. Such decays vanish within the SM and are highly suppressed in several theoretical extensions. Due to its relevance and relative simplicity to reconstruct the signal at future colliders, it is an important tool to probe SM...

22. Magnetized BEC stars at finite temperature

Lismary de la Caridad Suárez González (Instituto de Cibernética Matemática y Física,Habana, Cuba)

Poster (Theory)

We study magnetic field and temperature effects on the Equations of State (EoS) and the structure of a compact object composed by a gas of interacting spin one bosons formed up by the pairing of two neutrons. We have considered independently that particle-magnetic field and particle-particle interactions. The magnetic field provokes anisotropic equation of the state so it is not valid any more...

55. New anisotropic solution of Einstein's equations

Mr Pablo León (Universidad de Antofagasta)

Poster (Theory)

The aim of this work was to obtain new analitical solutions for Einstein equations in the anisotropical domain. This was done via the minimal geometric deformation (MGD) approach, which is a simple and systematical method that allow us to decouple the Einstein equations. It requires a perfect fluid known solution that we will choose to be Finch-Skeas(FS) solution. Two different constraints...

47. On the Propagation of Gravitational Waves in an Expanding Universe

Mr Mauricio Gamonal San Martín (PUC)

Cosmology

Poster (Theory)

Abstract
In [1,2], the influence of the cosmological constant in the propagation and measurement of Gravitational Waves (GW) was analyzed. In [3], a similar influence produced by non-relativistic matter was obtained. Thus, in this work we have generalized the effect for the case of an arbitrary perfect fluid, with equation of state $p=\omega_i \rho$, as the Universe background and used...

108. Phenomenology of Vector-like Heavy Fermions at High Energy Colliders

Dr Victor Peralta (UNMSM)

Poster (Theory)

Despite the success of the SM when compared with experiment related to the electroweak and strong interactions. we have quite important reasons to believe that the SM is not complete. The SM does not provide a satisfactory explanation to the hierarchy problem. Many extensions of the Standard Model that solve the hierarchy problem result in new particles. We will study the phenomenology of...

50. Photon trigger efficiency of the ATLAS detector in Run-2

Gonzalo Enrique Orellana (National University of La Plata (AR))

Poster (Experiment)

The production and efficient detection of photons in the ATLAS detector, plays an important role in the different analysis that takes place in the collaboration. Including both studies of the SM process and searches for new physics.

For the photon detection is essential a trigger system that allows a proper signal event selection, and also works for calibration, efficiency and identification...

63. Replica Trick and Entanglement Entropy

Mr Fernando Temoche Hurtado (Grupo de Física Teórica, Universidad Nacional Mayor de San Marcos)

Poster (Theory)

The present work is focused on the implementation of path integral formalism for the calculation of entanglement entropy (EE) in quantum field theories (QFT's). First we introduce the alternative definition of EE, $S(A)$, in terms of R\'enyi entropy, $S_n (A)$. Then, we implement the reduced density matrix $\rho_{A}$ as an euclidean path integral. Inmediately after that, we consider the case...

74. Research on flavor changing neutral currents beyond the Standard Model

Ricardo Gaitán (Universidad Nacional Autónoma de México)

Poster (Theory)

Models beyond the standard model with extra scalars have been highly motived by the discobery of the Higgs boson. The two Higgs doublet model type III considers the most general case for the scalar potential, allowing mixing between neutral CP-even and CP-odd scalars fields. This work presents the results of the study on the t -> c gamma, t -> c Z, and t -> c h_1 decays, where h_1 is the...

57. Search for composition-weighted correlations between UHECR events from the Pierre Auger Observatory and the Telescope Array with astrophysical gamma ray-sources

Vicente Poma (Pontificia Universidad Catolica del Peru)

Poster (Experiment)

We present a study connecting ultra-high energy cosmic rays (UHECR) events with gamma-ray astrophysical sources. We use UHECR data with energies greater than 80 EeV detected by the Pierre Auger Observatory and the Telescope Array. UHECR from extragalactic sources are likely made by protons and also light nuclei, as helium, and heavier nuclei. We consider several random mass compositions based...

26. Search for Vector-Like Fermions using missing transverse momentum and muons in a final state of pp-collisions in the HL-LHC and Phase-II CMS experiment

Diego Alberto Baron Moreno (Universidad de Antioquia)

Poster (Experiment)

In this poster I will present the simulation of a signal that could be found in the High Luminosity Large Hadron Collider. The signal represents a candidate for dark matter (DM) , based on models with extra partciles from the known standard model particles, an extra vector-like fermion doublet and a scalar DM candidate. The signal is thought to be consistent with photon excesses coming from...

81. Simulation of the response and calibration of a Water Cherenkov Detector using Geant4

VICTOR BRANCO VALERA BACA (UNIVERSIDAD NACIONAL DE INGENIERÍA)

Poster (Experiment)

Water Cherenkov Detectors (WCDs) are widely used for the study of the secondary cosmic rays flux at ground level and other high energy particles. Their performance is based on the emission of Cherenkov radiation in the active volume of the detector. This kind of radiation is emmited whenever a charged particle travels faster than the speed of light inside the medium. LAGO (Latin
American Giant...

80. Software algorithm implementation on geometric efficiency calibration for gamma spectrometry with scintillation detector using numerical methods

Mr Carlo Salvattore Cruz Sanchez (Universidad Nacional Mayor de San Marcos)

Poster (Theory)

Gamma spectrometry (γ) is used to detect photons with different energies, which characterize the different elements of radioactive samples. For this process there are several types of detectors applied to various types of sources. The present study focuses on obtaining a geometric efficiency calibration software, which will be used to introduce experimental characteristics, such as source...

48. Spontaneous Breaking of Supersymmetry in the Wess-Zumino Model

Diana Garcia Sandoval (Universidad Nacional de Colombia)

Poster (Theory)

Exact unbroken supersymmetry implies that particles and their superpartners would have the same mass and therefore it should be able to recreate them in high energy particle accelerators. However, the lack of evidence for the existence of this superpartners suggests that if nature is, in fact, supersymmetric it must be spontaneously broken so the superpartners become much heavier than their...

78. Study of Higgs potential in an abelian extension of the Standard Model

Mr Vinasco Soler Rafael Andrei (Universidad NAcional de Colombia)

Poster (Theory)

An extension of the Standard Model of elementary particles (SM) is studied to explain the mass hierarchy of fermions. This extension is based on the assumption of a new non-universal abelian U (1) 'interaction, which introduces extra fermions for the cancellation of chiral anomalies. As a consequence, an extended scalar sector is necessary to use, which consists of three doublets and one Higgs...