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Haimon Otto Melchiors Trebien (UFSC)13/09/2021 16:00Poster
We discuss the exclusive photoproduction of ground and excited states of ψ(1S,2S) and Υ(1S,2S) in ultraperipheral collisions. Using the potential model in order to obtain the vector meson wave function, we find a good agreement of our calculations with data from the LHC and HERA colliders for J/ψ(1S,2S) and Υ(1S) in γp collisions. We extend the calculations to the nuclear target case applying...
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M. João Victor Zamperlini dos Santos (UFSC)13/09/2021 16:00Poster
In this work, it is done a study of the quark matter accordingly to the two-flavor Nambu-Jona Lasinio model, which it is considered only the up and down quark flavors, and it is done an analysis adding non-linear effects from QED (Quantum Electrodynamics) through the use of the effective lagrangian of Euler and Heisenberg. From the complete lagrangian, we obtain the gap equation that dictates...
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Thiago José Sales (Universidade Federal Fluminense)13/09/2021 16:00Poster
In this work we revisit the thermal relaxation of neutron stars. We focus particularly on the cooling of neutron stars whose mass is slightly greater than the value above which the direct urca process sets in. Considering different mechanisms for neutrino production in each region of the star, and working with some equations of state whose saturation properties as well its predicted neutron...
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Kayman Gonçalves (Unicamp)13/09/2021 16:00Poster
We argue that a detailed analysis of the spin alignement of vector mesons can serve as a probe of two little-understood aspects of spin dynamics in the vortical fluid: The degree of relaxation between vorticity and parton spin polarization, and the degree of coherence of the hadron wavefunction at freeze-out.
We illustrate these with a coalescence model.Based on https://arxiv.org/abs/2104.12941
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M. Ríchard Terra (IFUSP)13/09/2021 16:01Poster
Meson spectroscopy can be theoretically studied with lattice QCD, QCD sum rules and quark models. In all these approaches the results are obtained numerically. It would be useful to have an analytical formula for the energy levels of the meson systems. In this work we use the variational principle and apply it to heavy mesons. We derive an expression for the energy levels which depends on the...
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Rodrigues Everson Henrique13/09/2021 16:01Poster
In this study I analyze the scalar and vectorial Lee-Wick field, achieving analytically the propagator and numerically the energy and force. It is analyzed the interaction between charge and a conductive plate, which simulates a semi-transparent mirror. For both cases, scalar and vectorial, the interaction force shows extrema points for finite values of the Lagrangian coupling parameters. The...
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M. Mateus dos Santos (Centro Brasileiro de Pesquisas Físicas)13/09/2021 16:01Poster
In recent years new processes involving weak nuclear interactions have been studied experimentally and theoretically [1]. This kind of interactions play a fundamental role in the understanding heavier elements nucleosynthesis in the universe. The presence of heavy elements is only understood if stellar reactions take place involving regions of the nuclear chart far away from the stability...
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João Paulo Sampaio Santos (UERJ)13/09/2021 16:01Poster
In this work, a simple model of superconductivity of confined particles, which constitute low energy hadrons, such as quarks and gluons. Many models like these of superconductivity are already present in high energy physics, mainly in the study of color superconductivity. These models use in general a gluon propagator with specific electrical and magnetic effects, and after several...
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M. Vinicius Simoes Aderaldo (Universidade Federal de Pelotas)13/09/2021 16:02Poster
Quantum Chromodynamics (QCD) theory predicts that at high temperatures quarks and gluons are in a state of asymptotic freedom, constituting with leptons and photons the primitive plasma present in the Early Universe. When the plasma temperature drops below a certain critical value $T_c$, consequence of the expansion of the Universe, quarks become confined into hadrons. This process is usually...
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Dr Sergio Szpigel (Centro de Rádio-Astronomia e Astrofísica Mackenzie (CRAAM), Escola de Engenharia, Universidade Presbiteriana Mackenzie)13/09/2021 16:02Poster
We use the Monte Carlo particle physics code FLUKA to calculate gamma-ray spectra expected from solar flare energetic ion distributions. The FLUKA code includes robust physics-based models for electromagnetic, hadronic and nuclear interactions, sufficiently detailed for it to be a useful tool for calculating nuclear de-excitation, positron annihilation and neutron capture line fluxes and...
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Gláuber Sampaio dos Santos (Universidade Federal do Rio Grande do Sul)13/09/2021 16:02Poster
We study the prompt photon production at the CERN LHC energies considering the color dipole approach. We estimate the rapidity and transverse momentum distributions of prompt photon production considering the more recent phenomenological models for the dipole-proton scattering amplitude, which are able to describe the inclusive and exclusive ep HERA data. A comparison between the predictions...
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Rafael Pacheco (Universidade Federal de Santa Catarina)13/09/2021 16:02Poster
Magnetars and heavy-ion-collisions (HIC) are environments where only a robust theory to strong interactions can extract reasonable quantities in account with the astronomical observations and HIC-experiments nowadays. Because of the sign problem, the Quantum Chromodynamics (QCD) isn’t treatable to important cases where there are finite chemical potentials. From Nambu–Jona-Lasinio (NJL) model,...
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Erich Cavalcanti (CBPF)13/09/2021 16:03Poster
We propose to investigate in detail how field theory behaves in restricted spaces. To do so, we consider a parametric representation of Feynman amplitudes, which allows us to discuss the behavior up to all orders in a perturbative expansion and extract consequences valid in a global setting. As a first step, we employ periodically compactified spaces and consider a scalar field theory. We show...
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Prof. Renato Higa (Instituto de Fisica, Universidade de Sao Paulo)13/09/2021 16:03Poster
The Efimov effect is a counterintuitive phenomenon concerning three non-relativistic particles with pairwise interactions supporting only one very shallow, two-particle bound state. In the so-called unitary limit, where the two-particle bound state energy goes to zero, the three-particle spectrum exhibits an infinite tower of bound states geometrically separated by a constant factor $\sim...
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Ronaldo Lobato (Texas A&M University - Commerce)13/09/2021 16:03Poster
Extremely massive objects such as neutron stars serve as unique laboratories that allow the study of nuclear matter in exotic environments impossible to be reproduced on Earth. The microscopic description of the nuclear structure of neutron stars represents a big challenge for theoretical models. The large densities present in these stars, possibly beyond the nuclear density equilibrium, lead...
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Fernando G Gardim (Federal University of Alfenas - BRA)13/09/2021 16:03Poster
We show that, within the hydrodynamic framework of heavy-ion collisions, the mean transverse momentum of charged hadrons ($\langle p_t \rangle $) rises as a function of the multiplicity in ultra-central nucleus-nucleus collisions. The relative increase is proportional to the speed of sound squared ($c_s^2$) of the
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quark-gluon plasma, that is therefore accessible experimentally using... -
Prof. Manuel Malheiro (Instituto Tecnológico de Aeronáutica )13/09/2021 16:04Poster
In this work, we investigate neutron stars (NS) in $f(\mathcal{R,T})$ gravity for the case $R+2\lambda\mathcal{T}$, $\mathcal{R}$ is the Ricci scalar and $\mathcal{T}$ the trace of the energy-momentum tensor. The hydrostatic equilibrium equations are solved considering realistic equations of state (EsoS). The NS masses and radii obtained are subject to a joint constrain from massive pulsars...
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Carlos Eduardo Fontoura (IFT UNESP)13/09/2021 16:04Poster
We investigate the production of charmed hadrons ($\bar{D}$, $\Lambda_{c}$, $\Xi_{cc}$) and exotic tetraquarks ($T_{cc}$, $T_{bc}$) in relativistic heavy-ion collisions using the quark coalescence model. The yields are given by the overlap of the density matrix of the constituents in the emission source with the Wigner function of the produced meson, baryon and tetraquark. The wave functions...
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Jesuel Marques Leal Junior (University of São Paulo - São Carlos Institute of Physics)13/09/2021 16:04Poster
Gauge symmetries are pervasive in particle physics, guiding the formulation of all interactions within the Standard Model. Usual methods for the calculation of processes, observables and properties of particles rely on perturbative expansions, which fail to converge for non-abelian gauge theories in the low-energy regime. The lattice formulation of a gauge theory, inherently non-perturbative,...
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Kauan Marquez (Federal University of Santa Catarina, Brazil)14/09/2021 16:00Poster
In this work, we study magnetic field effects on neutron star matter containing the baryon octet and additional heavier spin 3/2 baryons (the Δ's). We make use of two different relativistic hadronic models that contain an additional vector-isovector self interaction for the mesons: one version of a relativistic mean field (RMF) model and the Chiral Mean Field (CMF) model. We find that both the...
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Brenda Malabarba14/09/2021 16:00Poster
We have recently studied the interactions of $D−\bar D$ + c.c with a nucleon, with the motivation to find formation of $P_c$ like states. We consider all interactions in s-wave and solve scattering equations. We find formation of nucleons with hidden charm, spin 1/2, 3/2 and positive parity. We earlier studied the interaction of $D−\bar D$ with a kaon, where a $K^∗$-meson is found to arise. In...
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Mlle Carline Biesdorf (Universidade Federal de Santa Catarina (UFSC))14/09/2021 16:00Poster
In the present work phase diagrams of QCD are obtained by means of two effective models. For the description of the quark matter we make use of the MIT bag model and a modification of this model, and for the description of the hadronic matter we make use of the non-linear Walecka model (NLWM). The Gibbs conditions are used to establish the crossing points of the pressures in function of the...
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Carlos Mena (UERJ)14/09/2021 16:00Poster
Many models have tried to explain some non-perturbative aspects of the strong interactions, in particular, the color confinement hypothesis of quantum chromodynamics (QCD), but actually, they do not fully explain it. In this work, we investigate some of these non-perturbative models for QCD with the purpose of testing its validity in the perturbative region of nuclear interactions where the...
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Edgar Huayra Paitan (UFSC)14/09/2021 16:01Poster
The double--parton scattering (DPS) at the hadron coliiders such as the LHC is sensitive to correlations in the double--parton distributions. When looking at inclusive observables, it is dominated at high energies (small x) by the interaction of 4 gluons in the initial state. In order to extract different information about the partons, we are interested in the interaction between two gluons...
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Cheryl Henkels de Souza (UFSC)14/09/2021 16:01Poster
In this work, the exclusive photoproduction of the ground and excited states of the heavy vector mesons $\psi(1S)$, $\psi(2S)$, $\Upsilon(1S)$ and $\Upsilon(2S)$ are discussed in ultraperipheral hadron collisions (UPCs) with proton and nucleus targets. Since we are interested in scatterings with the projectile being a virtual photon produced by the incoming hadron, we employ the color dipole...
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Pedro Alberto (Universidade de Coimbra)14/09/2021 16:01Poster
We study two-dimensional fermion motion with circular symmetry using
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both 3+1 and 2+1 Dirac equations with a general Lorentz structure. Using
a different approach than usual, we fully develop the formalism for
these equations using cylindrical coordinates and discuss the quantum
numbers, spinors and differential equations in both cases when there is
circular symmetry. Although there is no... -
Mlle Sílvia Nunes (Instituto Tecnológico de Aeronáutica)14/09/2021 16:01Poster
We investigate the structure of massive white dwarfs with finite temperature and their stability against radial oscillations, pycnonuclear reactions, and the inverse $\beta$-decay. Regarding the stellar fluid, we consider that it is composed of nucleons and electrons confined in a Wigner-Seitz cell surrounded by free photons. The star is considered with an isothermal core and a non-degenerate...
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Lucas Lazzari (Universidade Federal de Pelotas)14/09/2021 16:02Poster
We investigate the properties of electrically charged strange quark stars using an interacting quark matter equation of state (EoS) based on cold and dense perturbative quantum chromodynamics (pQCD). The stability of strange stars is analyzed considering different models for the electric charge distribution inside the star as well as for distinct values for the total electric charge. A...
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Yuri N. Lima14/09/2021 16:02Poster
A phenomenological study of the isolated photon production within the color dipole formalism is performed. Using the dipole approach we investigate the isolated photon cross section differential in the transverse momentum of the photon in $pp$ collisions at RHIC and LHC energies considering three different phenomenological models for the dipole cross section. The predictions for the rapidity...
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Dr Wilson Roberto Barbosa de Araújo (Secretaria da Educação do Estado de São Paulo (SEDUC), DE Norte 2)14/09/2021 16:02Poster
In this work we study the effect of scalar spin coupling of constituent quarks on nucleon electroweak properties by introducing a two momentum scales wave function. By comparing the one scale wave function and the two scales wave function models, we found that the last case has shown a reasonable description of static observables and of the ratio µpGEp/GMp in which the value of the zero of...
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Prof. Marcus Benghi Pinto (Universidade Federal de Santa Catarina)14/09/2021 16:02Poster
We use the renormalization group optimized perturbation theory (RGOPT) to evaluate the quark contribution, Pq, to the QCD pressure at NLO (two loop level). In this seminal application the complete QCD pressure is then obtained simply by adding the perturbative NLO contribution from massless gluons to the resummed Pq. At the central scale M∼2πT our complete QCD pressure, P=Pq+Pg, shows a...
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Yan Bueno Bandeira (Universidade Federal de Pelotas)14/09/2021 16:03Poster
The high energy regime of quantum chromodynamics (QCD) has been under intense investigation in electron-hadron and hadron-hadron collisions. In this regime, saturation effects associated with the high gluonic density are expected to modify the QCD dynamics, implying the presence of non-linear effects that reduce the growth of the gluon distribution at small-x. The description of the saturation...
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Sarah V. Borges (University of Wisconsin Milwaukee)14/09/2021 16:03Poster
The quiescent emission of the anomalous X-ray pulsar (AXP) 4U 0142+61 extends over a broad range of energy, from radio up to hard X-rays. In particular, this object is unique among soft gamma-ray repeaters (SGRs) and AXPs in presenting simultaneously mid-infrared emission and pulsed optical emission. In spite of the many propositions to explain this wide range of emission, it still lacks one...
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Dr Gilberto Ramalho (Uiversidade Cruzeiro do Sul)14/09/2021 16:03Poster
The electromagnetic structure of the nucleon resonances $N^\ast$ are usually parametrized by $\gamma^\ast N \to N^\ast$ helicity amplitudes, at the resonance rest frame. Those amplitudes are, however, constrained by kinematic conditions in the limit where the photon three-momentum vanishes (pseudothreshold limit). Although the pseudothreshold limit is below the photon point ($Q^2=0$) it has an...
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Odilon Ardizzon Mattos (Instituto Tecnológico de Aeronáutica (ITA))14/09/2021 16:03Poster
The effective quark model Polyakov-Nambu-Jona-Lasinio (PNJL) incorporates the effect of confinement/deconfinement on the original Nambu-Jona-Lasinio model (NJL) by inserting the Polyakov Loop ($\Phi$) on the equations of states~(EOS) at finite temperature. However, at zero temperature regime, the PNJL loses all contributions of $\Phi$ and the EOS returned for the same as original NJL equations...
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Guilherme Germano (Aluno de pós-graduação)14/09/2021 16:04Poster
Our first goal in this work is to evaluate the moments of the multiplicity distributions (MD) in pp collisions recently measured on the LHC, as the moments have not been published by the collaboration.
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We explore the possibility of fitting this moments with negative binomial distribution (NBD) describing the MD, using a simple power law to describe dependence on energy of the mean... -
Emmanuel de Oliveira (UFSC)14/09/2021 16:04Poster
Predictions for Drell--Yan lepton pair production at low dilepton mass and small x at the LHC usually have a large scale dependence, that can be decreased through obtaining an optimal factorization scale. In this paper, we reduce this scale by imposing a cutoff in azimuthal angle between the transverse momentum of the leptons, properly taking into account Sudakov effects. This would allows one...
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Germán Lugones (Universidade Federal do ABC)14/09/2021 16:04Poster
We study hybrid stars considering the effects on stellar stability of the hadron-quark conversion speed at the sharp interface. The equation of state is constructed by combining a model-agnostic hadronic description with a constant speed of sound model for quark matter. We show that current LIGO/Virgo, NICER, low-density nuclear and high-density perturbative QCD constraints can be satisfied in...
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Isabella Marzola15/09/2021 16:00Poster
Since an absolute stable strange quark matter was conjectured [1], based on a simple model known as the MIT bag model [2], different versions of density dependent quark models were proposed, but they lack thermodynamic consistency [3]. By using a thermodynamically consistent quark matter model called equiparticle model [4], that is based on a density dependent mass, the...
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Mme Bruna de Oliveira Stahlhoffer (UFSC)15/09/2021 16:00Poster
We discuss the associated $c\bar{c}$ and $l^+l^-$ pairs production in ultraperipheral heavy-ion collisions at high energies. Such a channel provides a novel probe for double-parton scattering (DPS) at small $x$ enabling one to probe the photon density inside the nucleus. We have derived an analog of the standard central $pp$ pocket formula and studied the kinematical dependence of the...
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Mme Chiara M. Le Roux (Instituto de Física da Universidade de São Paulo (IFUSP))15/09/2021 16:00Poster
When relativistic heavy ions collide, a plasma of quarks and gluons (QGP) is created. This system cools down, expands and eventually reaches hadronization temperature, when a hadron gas is formed. During this phase, the constituents of the gas, among which are the K and K* mesons, can undergo further interactions and change their abundances with respect to predictions by statistical...
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Milena Bastos Albino15/09/2021 16:00Poster
The QCD phase diagram at low temperature and high chemical potential still remains poorly understood. Several calculations suggest that, in this region, matter deconfines into a phase of quarks and gluons (known as cold QGP or quark matter), which can exist in the core of neutron stars. It is even possible that neutron stars are formed entirely by cold QGP. Usually we model neutron stars with...
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Luan Costa (IF-UFRGS)15/09/2021 16:01Poster
The effect of deformation on compact stars, especially neutron stars, is widely known. This can happen for several reasons: intense magnetic fields and high rotation are the main ones. In this sense, taking into consideration influences both in the metric and in the matter structure, through deformed geometries, anisotropies in the energy-momentum tensor, or adequate equations of state, a more...
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Fabiana Carvalho (UNIFESP)15/09/2021 16:01Poster
Leading neutron (LN) production in ep collisions at high energies is investigated using the color
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dipole formalism and taking into account saturation effects. We update the treatment of absorptive
effects and estimate the impact of these effects on LN spectra in the kinematical range that will
be probed by the Electron Ion Collider (EIC) and by the Large Hadron electron Collider... -
Mlle Isabella Danhoni (USP)15/09/2021 16:01Poster
In relativistic non-central heavy-ion collisions an intense magnetic field is produced. Classical fields can be used to describe quantum fields when the occupation of each field mode is sufficiently high. In this work, we test the classical magnetic field approximation in heavy-ion collisions. First, we use a classical field to study the forward pion production by the magnetic excitation of...
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M. Vitor Mendrot (UNESP)15/09/2021 16:01Poster
The planar motion of spin-1/2 fermions under the influence of a homogeneous magnetic field is described by the Feynman-Gell-Mann formulation of the Dirac equation. The axially symmetric gauge is used for the vector potential in such a way that the Dirac spinor is written in terms of eigenstates of the quiral operator and the third component of the total angular momentum operator. The spinors...
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Celso Rodrigues Sena (Universidade Federal de Pelotas)15/09/2021 16:02Poster
The exclusive vector meson production in electron – ion collisions for the energies of the future colliders is investigated. We present predictions for the coherent and incoherent Phi and J/psi production in eAu collisions considering the possible states of nucleon configurations in the nuclear wave function and taking into account of the non - linear corrections to the QCD dynamics. The...
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Cristiane de Paula Oliveira (Universidade Federal do Rio Grande do Sul)15/09/2021 16:02Poster
Dark photon is a theoretical boson that mediates the interaction between dark matter particles. The dark photon can interact with the Standard Model photon by kinetically mixing with it. In this work, we study the dark photon production via Compton-like process in ultrarelativistic electron-ion collisions. We search for massive dark photons in planned electron-ion collider machines such as...
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Reinaldo Francener (Universidade do Estado de Santa Catarina)15/09/2021 16:02Poster
One interesting subject of the QED are the lepton – antilepton bound states, which are atom – like systems. These systems are ideal to test the ground of QED, once they allow us to test the CPT invariance of the theory, as demonstrated by several authors. Besides that, recent studies point out that these QED bound states can be sensitive to Beyond Standard Model Physics. Currently, we can...
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M. Bruno Alves de Moura Soares (Instituto Tecnológico de Aeronáutica)15/09/2021 16:02Poster
In this work, we present a preliminary study where the Bayesian analysis is used to constraint saturation properties of nuclear matter. For this, an equation of state (EoS) that allows $\omega-\rho$ interactions is considered. Regarding the priors, uniform distribution on the values of saturation density, binding energy, effective mass, incompressibility, symmetry energy, and its slope at...
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Dr Angelo Cerqueira da Cunha Júnior (UEZO)15/09/2021 16:03Poster
Recently, we made a calculation of the form factors and coupling constant of $DsDK^*$ using the QCD Sum Rules. This information is fundamental to compute the amplitude for the process $B\rightarrow K^*\pi$ in effective theories. The method used considers the three cases of different off-shell mesons. After an extrapolation of the results of QCD Sum rules, we obtain the coupling constant of the...
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Victor Silva (UDESC)15/09/2021 16:03Poster
Recently, STAR made measurements of pair production at very low transverse momenta and a significant excess with respect to hadronic cocktail in peripheral Hadronic Heavy Ion Collisions (HHICs) was observed. The excess pairs have transverse momenta $p_{T} < 150$ MeV/c and are most prominent in peripheral gold-gold and uranium-uranium collisions. The ALICE Collaboration observes a similar...
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M. Thiago Henrique Moreira (Universidade Federal de Goiás)15/09/2021 16:03Poster
In this work we calculate corrections to the NJL model coupling constant in the presence of a uniform magnetic field. Starting with the Nambu-Jona-Lasinio Lagrangian coupled with a U(1) gauge field, namely a magnetic field, the background field method is employed. By expanding the quark determinant in terms of the quark bilinears we show that the first-order term provides a correction to the...
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M. Rodrigo Terin (Instituto Tecnológico de Aeronáutica (ITA))15/09/2021 16:03Poster
We investigate the generation of a gluon screening mass in Yang-Mills theory in the Landau gauge. We propose a gauge-fixing procedure where the Gribov ambiguity is overcome by summing over all Gribov copies with some weight function. This can be formulated in terms of a local field theory involving constrained, nonlinear sigma model fields. We show that a phenomenon of radiative symmetry...
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M. Mateus Pelicer (Universidade Federal de Santa Catarina)15/09/2021 16:04Poster
Exotic shapes of nuclei, known as nuclear pasta phase, can exist in the crust of neutron star and in supernovae exposions. Calculations involving the pasta assume a perfectly crystalline structure, described by identical Wigner-Seitz cells, but such an approximation is unrealistic due to the small free energy variation with respect to the different pasta configurations, and these may coexist...
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João Paulo Picchetti (Universidade Estadual de Campinas)15/09/2021 16:04Poster
The main interest in relativistic heavy-ion collisions is the study of properties of the Quark Gluon Plasma (QGP). From a theoretical point of view, hybrid approaches, where different models are used to describe specific stages of the heavy-ion collision have had great success in describing a wide range of final state hadronic observables. Most of these models include an initial conditions...
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