Dark Matter

• FARINALDO queiroz (International Institute of Physics -Natal)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Gravity waves speed in Non-Abelian Galileon vector theory

• Yeinzon Rodriguez Garcia (UAN & UIS (Colombia))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Strong gravitational radiation from a simple dark matter model

• Camilo Garcia Cely (DESY)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) A rather minimal possibility is that dark matter consists of the gauge bosons of a spontaneously broken symmetry. Here we explore the possibility of detecting the gravitational waves produced by the phase transition associated with such breaking. Particularly promising for LISA is the super-cool dark matter regime, with DM masses above 100 TeV, for which we find that the gravitational wave signal is notably strong. ONLINE TALK.

Two-component dark matter in a new B-L model

• Carlos E. Yaguna

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) We propose a new extension of the Standard Model by a U(1)B−L gauge symmetry in which the anomalies are canceled by two right-handed neutrinos plus four chiral fermions with fractional B-L charges. Two scalar fields that break the B-L symmetry and give masses to the new fermions are also required. After symmetry breaking, two neutrinos acquire Majorana masses via the seesaw mechanism leaving a massless neutrino in the spectrum. Additionally, the other new fermions arrange themselves into two Dirac particles, both of which are automatically stable and contribute to the observed dark matter density. This model thus realizes in a natural way, without ad hoc discrete symmetries, a two-component dark matter scenario. We analyze in some detail the dark matter phenomenology of this model. The dependence of the relic densities with the parameters of the model is illustrated and the regions consistent with the observed dark matter abundance are identified. Finally, we impose the current limits from LHC and direct detection experiments, and show that the high mass region of this model remains unconstrained.

Dark Matter in a Standard Model extension with additional $U(1)$ symmetry

• José Halim (Universidad Nacional Autónoma de México)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) We consider a model with $U(1)^\prime$ local gauge symmetry, additional to the Standard Model gauge symmetry, which is broken by a singlet field scalar. In addition, the scalar sector contains two doublet scalar field. One of them is the usual Standard Model doublet scalar field that breaks the electroweak symmetry, meanwhile the second one is included to introduce the Weak Interacting Massive Particle that play the role of candidate for Dark Matter. The $Z_2$ discrete symmetry can be considered to eliminated the interactions in the potential which do not allow the stability of the Dark Matter candidate. We solve the Boltzmann equation to find the relic density for Dark Matter as a function of the scalar potential parameters, the new symmetry breaking scale and the $U(1)^\prime$ gauge coupling constant.

Soft theorems in inflation and observations

• Jorge Noreña

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Self gravitating systems of elementary particles as Models for DM halos & Structure Formation

• Carlos Arguelles (University of Wisconsin - Madison)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Arbitrarily coupled $p-$forms in cosmological backgrounds

• Alejandro Guarnizo

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) In this talk we consider a model based on interacting $p-$forms and explore some cosmological applications. Restricting to gauge invariant actions, we build a general Lagrangian allowing for arbitrary interactions between the $p-$forms (including interactions with a $0-$form, scalar field) in a given background in $D$ dimensions. For simplicity, we restrict the construction to up to first order derivatives of the fields in the Lagrangian. We discuss with detail the four dimensional case and devote some attention to the mechanism of topological mass generation originated by the coupling $B\wedge F$ between a $1-$form and a $2-$form. As a result, we show the system of the interacting $p-$forms $(p=1,2,3)$ is equivalent to a parity violating, massive, Proca vector field model. Finally, we present a minimalistic cosmological scenario composed by a $3-$form coupled to a $0-$form. We study the dynamics of the system and determine its critical points and stability. Among the results, we show that this system offers an interesting arena to cosmological applications, such as dark energy, due to the existence of scaling matter solutions.

Dark energy from SO(3) and SU(2) representations of the Yang-Mills-Scalar theory.

• JOHN BAYRON ORJUELA-QUINTANA (UNIVERSIDAD DEL VALLE)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) In this work we study the cosmological implications of a Yang-Mills-Scalar theory in the SO(3) and SU (2) representations in expanding Friedmann-Lemaı̂tre-Robertson-Walker uni- verse. First, we show that not all configurations of the fields are compatible with an isotropic space-time as it is claiming in literature and then, after choosing carefully a particular con- figuration of the fields, we use the dynamical systems technique to study the cosmological implications of the models, in particular we show that it is posible to describe the late time evolution of the universe.

DARK ENERGY FROM MODIFIED GRAVITY AND THE HOLOGRAPHIC PRINCIPLE

• GERMAN D. ROJAS (UNIVERSIDAD DEL VALLE)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) The holographic dark energy could be interpreted as an infrared cut-off for modified gravity theories $f(R)$. In this approach, several reference modified gravity models can be analyzed, and a reconstruction method for different cosmological scenarios can be done. From the analysis of the autonomous system and the stability of perturbations to the dark energy sector, it was found that the forbidden gap $-7.6<\omega_{eff}<-1.07$ present in $f(R)$ models is now allowed.

Stationary Worldline Power Distributions

• Michael Good (Nazarbayev University)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) A stationary worldline is one of the most simple non-trivial motions in physics. Point charges moving along these trajectories emit constant radiative power. The angular distribution of this power is found for all stationary worldlines including those with torsion and hypertorsion.

Long-bases neutrino experiments

• Deywis Moreno Lopez (Universidad Antonio Narino (CO))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Neutrinos de Reactores

• David Martinez Caicedo (South Dakota School of Mines and Technology)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Status of the NEXT-White neutrinoless double beta decay experiment

• Yohany Rodriguez Garcia

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) The \textit{Neutrino Experiment with a Xenon TPC} (NEXT-100) is a detector scheduled to start searching for $\beta\beta0\nu$ decays in $^{136}$Xe in 2020 at the Laboratorio Subterráneo de Canfranc (LSC), in Spain. The concept of a high pressure xenon gas time projection chamber with electroluminescent amplification (EL HPGXe TPC) offers an excellent energy resolution ($0.5 - 0.7\%$ FWHM at the $Q_{\beta\beta}$). The NEXT collaboration is currently operating a first phase of the NEXT-100 experiment at the LSC, called NEXT White(NEW). This detector is the largest high pressure xenon gas TPC using electroluminescent amplification in the world. The NEW detector is able to measure the energy of the event using a plane of photomultipliers located behind a transparent cathode. It is also equipped with a plane of silicon photomultipliers located behind the anode, which can be used to reconstruct the trajectories of the charged tracks in the dense TPC. The NEW detector is a scale of 1:2 in size of the NEXT-100 detector and uses the same materials and photosensors. It will be used to perform a characterization of the $0 \nu\beta\beta$ backgrounds and a measurement of the standard two-neutrino double beta decay rate. In this talk an overview of the NEW detector and some recent results using calibration data are presented.

Dirac neutrino masses

• Diego Restrepo (Universidad de Antioquia)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) Realization of B-L models for neutrino masses and dark matter

Inclusive Displaced Vertex Searches for Heavy Neutral Leptons at the LHC

• Nicolás Bernal (Universidad Antonio Nariño)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) The inclusion of heavy neutral leptons to the Standard Model particle content could provide solutions to many open questions in particle physics and cosmology. The modification of the charged and neutral currents from active-sterile mixing of neutral leptons can provide novel signatures in Standard Model processes. We revisit the displaced vertex signature that could occur in collisions at the LHC via the decay of heavy neutral leptons with masses of a few GeV emphasizing the implications of flavor, kinematics, inclusive production and number of these extra neutral fermions. We study in particular the implication on the parameter space sensitivity when all mixings to active flavors are taken into account. We also discuss alternative cases where the new particles are produced in a boosted regime.

Cosmic Rays

• Federico Sanchez

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Resonances + Top partners + Dark Matter

• Juan Alberto Yepes Tamayo (Kavli Institute for Theoretical Physics China)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) Top partners and vector/scalar resonances are coupled in a interplaying Composite Higgs framework. The entailed phenomenology is analysed via resonances decay channels and top partners production mechanisms. Recent LHC searches for vector-like quarks production in pp-collisions at 13 TeV have been imposed to exclude regions of the underlying parameter spaces. Furthermore, the WIMP-nucleon scattering cross section in a simple dark matter model and its constraints from the latest direct detection experiment are treated at the loop level. The involved dark matter-mediator masses are constrained by the Xenon1T limit and the neutrino floor. The current direct detection bounds are eluded by invoking the top partners, whose scale mass aids us in properly suppressing the WIMP-nucleon cross section.

Spin Correlations in Dark Matter Production in Association with Top Quarks at Hadron Colliders

• Alexander Moreno Briceño (Universidad Antonio Nariño)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) We study possible top quark spin correlation effects in Dark Matter (DM) production in association with top quarks at the LHC. Final states and their kinematic properties are studied in detail at the 14 TeV LHC. We show some preliminary results of angular correlations and distributions of the top quarks which may allow us to explore the DM interactions.

Deviations to Tri-Bi-Maximal mixing in the limit of $\mu-\tau$ symmetry

• Diana Rivera (USC)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) In the limit of an approximate $\mu-\tau$ symmetry in the neutrino mass matrix, we explore deviations to the Tri-Bi-Maximal mixing pattern in the neutrino sector. The correction matrix is parametrized as $U_{ij}(\phi,\sigma)U(\alpha_1,\alpha_2)$, where $\phi$ is the rotation angle in the $ij$ flavors, and $\sigma$, $\alpha_1$ and $\alpha_2$ are complex phases. We show that the $ij=13$ and $23$ scenarios are able to predict the current values of neutrino mixings and that it is possible to constrain the Majorana $CP$ phases by studying their correlation with the mixing angles. We study the impact of such predictions in the neutrinoless double beta decay. The predicted regions are sharp for the quasi-degenerate ordering and can be tested in forthcoming experiments.

Mixing and mass Matrix of neutrino in the Two Higgs Doublet Model type III

• Julian Steven Gutierrez Saavedra (National University of Colombia)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) In this work we propose an extension to the Standard Model in which we consider a type-III two-Higgs-doublet model (2HDM-III) plus massive neutrinos and the horizontal flavor symmetry S3. Where the Yukawa matrices in the flavor-adapted basis are represented by means of a matrix with two texture zeros. Also, the active neutrinos are considered as Majorana particles and their masses are generated through the type-I seesaw mechanism. The unitary matrices that diagonalize the mass matrices, as well as the flavor-mixing matrices, are expressed in terms of fermion mass ratios. we compare, through a χ2 test, the theoretical expressions of the flavor-mixing angles with the masses and flavor-mixing leptons current experimental data.

High Scale masses for one model coming from E6 Gauge Group

• Richard Hamilthon Benavides Palacios (Instituto Tecnológico Metropolitano)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

A taste of flavor symmetries from string theory

• Saul Ramos-Sanchez (UNAM)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

BSM Higgs with ATLAS

• Arnaud Ferrari (Uppsala University (SE))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

CMS highlights

• Carlos Andres Florez Bustos (Universidad de los Andes (CO))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Search for supersymmetry with a compressed mass spectrum in the vector boson fusion topology with 1-lepton and 0-lepton final states in proton-proton collisions at √s = 13 TeV

• Jose Ruiz (Universidad de Antioquia (CO))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) A search for supersymmetric particles produced in the vector-boson fusion topology is presented. The search targets final states with one or zero leptons, large missing transverse momentum (transverse missing momentum), and two jets with a large separation in rapidity. The data sample corresponds to an integrated luminosity of 35.9 /fb of proton-proton collisions at √s = 13 TeV collected with the CMS detector during 2016 at the CERN LHC.

Production of a light top-squark pair in association with a light non-standard Higgs boson within the NMSSM at the 13 TeV LHC and a 33 TeV proton collider

• Jorge Fernando Fraga (Universidad de los Andes (CO))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (${{\tilde t}_1} {{\tilde t}_1}^* h_1$), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, $h_2$, assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode is ${{\tilde t}_1} \rightarrow b \tilde{\chi}_1^{\pm}$ with $\tilde{\chi}_1^{\pm} \rightarrow W^{\pm} \tilde{\chi}_1^0$. We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both $W$'s and the decay of lightest Higgs boson into b-quarks ($h_1\rightarrow b \bar b$). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background.

Phenomenological and experimental searches for compressed stau-neutralino production at the LHC.

• Manuel Alejandro Segura D. (Universidad de los Andes)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) We propose an experimental search for physics beyond the standard model at the Compact Muon Solenoid (CMS) experiment, using as benchmark a supersymmetric model in the electroweak sector. We focus in final states containing a hadronic tau, a jet from initial state radiation and a large imbalance of energy in the transverse plane of the detector. The search focuses in compressed mass spectra scenarios, where the mass difference between the stau ($\widetilde{\tau}$) and the lightest supersymmetric particle, the neutralino ($\widetilde{\chi}_{0}$), is small. The proposed analysis is of special scientific interest, since, it is motivated by a direct connection between particle physics and cosmology. To obtain the correct relic dark matter density predicted by cosmology, in thermal dark matter models, the mass gap between the $\widetilde{\tau}$ and the $\widetilde{\chi}_{0}$ must be small. The phase space at LHC for compressed $\widetilde{\tau}'s$ is very difficult to prove. A phenomenological study has been performed for the proposed final state, showing good sensitivity to search for new physics in this difficult region, which yet remains as uncharted territory at the LHC.

Latest charm and beauty results in LHCb

• Alberto Correa Dos Reis (CBPF - Centro Brasileiro de Pesquisas Fisicas (CBPF))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

The PANDA physics program at FAIR-GSI

• Bruno El-Bennich (Universidade Cruzeiro do Sul)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Holographic description of the Quark Gluon Plasma using AdS/QCD

• Miguel Angel Martín Contreras (Universidad de Valparaíso)

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4)) In this talk, we will describe a toy model to approach the QGP phenomenology based on the so-called AdS/QCD Soft Wall Model, defined by the presence of static quadratic dilaton in the background. We will focus on the photon emission analyzed from the Schrödinger-like holographic potentials and, the drag force calculated from open strings propagating in the AdS-black-hole (Schwartzchild and Reissner-Nordstrom) geometries.

Poster Session Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Scientific computing

• Arturo Sanchez Pineda (Abdus Salam Int. Cent. Theor. Phys. (IT))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Taller computing

• Arturo Sanchez Pineda (Abdus Salam Int. Cent. Theor. Phys. (IT))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Taller computing

• Arturo Sanchez Pineda (Abdus Salam Int. Cent. Theor. Phys. (IT))

Room: Auditorio Auxiliar del Aula Máxima (Bloque 3, Piso 4))

Neutrinos in the precision era

• Omar Miranda (Cinvestav)

Room: Auditorio Pedro Elias (Bloque 4, Piso 3)

Neutrino mass models and dark matter

• Eduardo Peinado (Universidad Nacional Autonoma de Mexico)

Room: Auditorio Pedro Elias (Bloque 4, Piso 3)

Looking for lepton-number-violating processes in $|\Delta L|=2$ decays of $B_s$ meson and $\Lambda_b$ baryon

• Nestor Quintero (Universidad Santiago de Cali)

Room: Auditorio Pedro Elias (Bloque 4, Piso 3) Lepton-number violation can be induced by the exchange of an on-shell Majorana neutrino N in rare semileptonic $|\Delta L|=2$ decays of the $B_s$ meson and $\Lambda_b$ baryon. We investigate the production of such a heavy sterile neutrino through these four-body $\mu^+\mu^+$ channels and explore the sensitivity that can be reached at the LHCb and CMS experiments. For heavy neutrino lifetimes of $\tau_N$ = [1, 100, 1000] ps and integrated luminosities collected of 10 and 50 fb$^{-1}$ at the LHCb and 30, 300, and 3000 fb$^{-1}$ at the CMS, we find a significant sensitivity on branching fractions of the orders $\sim 10^{-9} - 10^{-8}$. In the kinematically allowed mass ranges of mN, we exclude regions on the parameter space ($m_N,|V_{\mu N}|^2$) associated with the heavy neutrino.

Heavy neutrino searches at the LHC with displaced vertices

• Juan Helo (Universidad de La Serena)

Room: Auditorio Pedro Elias (Bloque 4, Piso 3) For Majorana neutrino masses the lowest dimensional operator possible is the Weinberg operator at d = 5. Here we discuss the possibility that neutrino masses originate from higher dimensional operators. Specifically, we consider all tree-level decompositions of the d = 9, d = 11 and d = 13 neutrino mass operators. Despite the large number of possible models, we found only very few genuine neutrino mass models: At d = (9, 11, 13) we find only (2,2,2) genuine diagrams and a total of (2,2,6) models. Here, a model is considered genuine at level d if it automatically forbids lower order neutrino masses without the use of additional symmetries. We also analyse systematically all possible genuine 1-loop dimension 7 neutrino mass models and discuss 2 examples in detail.

Minimal $Z'$ models for flavor anomalies

• Eduardo Rojas (Universidad de Nariño)

Room: Auditorio Pedro Elias (Bloque 4, Piso 3) We present the most general solutions for the charges of a nonuniversal $Z'$ model with the same content of fermions of the standard model plus three right-handed neutrinos. From our analysis, we show the existence of three different scenarios which, as far as we know, are new in the literature. However, these solutions reduce to very well-known cases for particular choices of the free parameters. We also define several benchmark models in order to show the flexibility of our parameterizations. Finally, we show that it is possible to adjust some of these benchmark models to several observables, including $C_9$ and $C_{10}$ which are involved in the LHCb anomalies. We use the upper limits on the $Z'$ cross-sections of extra gauge vector bosons $Z'$ decaying into dileptons from the ATLAS data at 13 TeV with an accumulated luminosity of 36.1~fb$^{-1}$ to set the 95\% CL allowed regions in the parameter space for a $Z'$ mass of $5$~TeV.