Información del autor
Autor Llanes Estrada, Felipe José |
Documentos disponibles escritos por este autor (114)
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In this article we re-derive the Boost operators in Coulomb Gauge Yang-Mills theory employing the path integral formalism and write down the complete operators for QCD. We immediately apply them to note that what are usually called the pion squa[...]texto impreso
If cooled-down neutron stars have a thin atomic crystalline-iron crust, they must diffract X-rays of appropriate wavelength. If the diffracted beam is to be visible from Earth (an extremely rare but possible situation), the illuminating source m[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2010We introduce the concept of viscosity (both shear and bulk) in the context of hadron physics. and in particular the meson gas, highlighting the current theoretical efforts to connect possible measurements of the viscosities to underlying physics[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan Miguel | Springer | 2012-02We show how the measurement of appropriately constructed particle-energy/momentum correlations allows access to the bulk viscosity of strongly interacting hadron matter in heavy-ion collisions. This measurement can be performed by the LHC and RH[...]texto impreso
We compute one of the bulk viscosity coeffcients of cold color -flavor locked ( CFL) quark matter in the temperature regime where the contribution of mesons, quarks and gluons to transport phenomena is Boltzmann suppressed. In that regime dissip[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | Elsevier Science BV | 2011-08-03We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation Theory at low and moderate temperatures, below any phase transition to a quark-gluon plasma phase. We argue that inelastic processes are irrelevant and exponentially sup[...]texto impreso
Llanes Estrada, Felipe José ; Torres Rincón, Juan Miguel ; Cabrera Urban, Daniel | Academic Press Inc Elsevier Science | 2011-10We compute the charm drag and diffusion coefficients in a hot pion gas, such as is formed in a heavy ion collision after the system cools sufficiently to transit into the hadron phase. We fully exploit heavy quark effective theory (with both D a[...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Gómez Nicola, Ángel | World Scientific Publ Co Pte Ltd | 2005We review our recent work on thermal meson proper-ties within the Chiral Perturbation Theory framework. We will focus on the pion electromagnetic form factor, stressing its importance for Relativistic Heavy Ion Collisions. We obtain model-indepe[...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Stephen R. ; Szczepaniak, Adam P. ; Swanson, Eric S. | Springer-Verlag | 2004-03We review theoretical calculations for the pseudoscalar vector meson hyperfine splitting with no open flavor and also report a many body field theoretical effort to assess the impact of chiral symmetry in the choice of effective potentials for r[...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Stephen R ; Szczepaniak, Adam P ; Swanson, Eric S | Springer | 2004-07We review theoretical calculations for the pseudoscalar vector meson hyperfine splitting with no open flavor and also report a many body field theoretical effort to assess the impact of chiral symmetry in the choice of effective potentials for r[...]texto impreso
We reexamine the dynamical generation of mass for fermions charged under various Lie groups with equal charge and mass at a high Grand Unification scale, extending the Renormalization Group Equations in the perturbative regime to two loops and m[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Espada, Miguel ; Llanes Estrada, Felipe José ; León Merino, Iván | Springer | 2018-11-05We estimate production cross sections for 2-body resonances of the Electroweak Symmetry Breaking sector (in W_(L)W_(L) and Z_(L)Z_(L) rescattering) from ?? scattering. We employ unitarized Higgs Effective Field Theory amplitudes previously compu[...]texto impreso
The finding of Gravitational Waves (GW) by the aLIGO scientific and VIRGO collaborations opens opportunities to better test and understand strong interactions, both nuclear-hadronic and gravitational. Assuming General Relativity holds, one can c[...]texto impreso
An effective Coulomb gauge Hamiltonian, H-eff, is used to calculate the light ( u (u) over barg), strange ( s (s) over barg) and charmed (c (c) over barg) hybrid meson spectra. For the same two parameter H-eff providing glueball masses consisten[...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Steve ; General, Ignacio ; Wang, Ping | American Institute of Physics | 2008The Coulomb gauge model, involving an effective QCD Hamiltonian in the Coulomb gauge, is applied to scalar hadrons. Mass predictions are presented for both conventional q ¯ q meson and q ¯ qq ¯ q tetra-quark states. Mixing matrix elements betwee[...]texto impreso
We report a relativistic many-body calculation for the hybrid meson spectrum utilizing a QCD inspired Coulomb gauge Hamiltonian. Our approach is comprehensive and unifies the quark and gluon sectors. The vacuum and quasiparticle properties are g[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Springer | 2017-03-31We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to ? ? , employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the Equivalence Theorem, while n[...]texto impreso
Llanes Estrada, Felipe José ; Moreno Navarro, Gaspar | World Scientific Publ Co Pte Ltd | 2012-02-28The neutron is largely spherical and incompressible in atomic nuclei. These two properties are however challenged in the extreme pressure environment of a neutron star. Our variational computation within the Cornell model of Coulomb gauge QCD sh[...]texto impreso
We summarise results on the infrared behaviour of Landau gauge QCD from the Green's functions approach and lattice calculations. Approximate, nonperturbative solutions for the ghost, gluon and quark propagators as well as first results for the q[...]texto impreso
Llanes Estrada, Felipe José ; Alkofer, Reinhard ; Fischer, Christian S | World Scientific Publ Co Pte Ltd | 2008-05-20We employ a functional approach to investigate the confinement problem in quenched Landau gauge QCD. We demonstrate analytically that a linear rising potential between massive quarks is generated by infrared singularities in the dressed quark-gl[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Rodríguez Fernández, David | World Scientific Publ Co Pte Ltd | 2016-07-30We point out that in the early universe, for temperatures in the approximate interval 150-80 MeV (after the quark-gluon plasma), pions carried a large share of the entropy and supported the largest inhomogeneities. Its thermal conductivity (prev[...]texto impreso
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Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Physical Society | 2009-01-07We present a calculation of eta/s for the meson gas (zero baryon number), with the viscosity computed within unitarized next-to-leading-order chiral perturbation theory, and confirm the observation that eta/s decreases towards the possible phase[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | Amer Inst Physics | 2009The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this quantity does have a minimum at a phase transition or crossover. A[...]texto impreso
Llanes Estrada, Felipe José ; Bicudo, Pedro ; Cardoso, Marco ; Van Cauteren, Tim | Polska Akademia Nauk, Instytut Fizyki | 2009-05-26We observe that excited hadrons provide an opportunity to probe from experiment the power-law running of the quark mass in the mid infrared, while the condition m(k)texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Oller, Jose Antonio | Amer Physical Soc | 2012-01-20In general relativity, there is a maximum mass allowed for neutron stars that, if exceeded, entails collapse into a black hole. Its precise value depends on details of the nuclear matter equation of state, a subject where much progress has been [...]texto impreso
We study the multiple solutions of the truncated propagator Dyson-Schwinger equation for a simple fermion theory with Yukawa coupling to a scalar field. Upon increasing the coupling constant g, other parameters being fixed, more than one non-per[...]texto impreso
Llanes Estrada, Felipe José ; Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2002-12-12We present the pion-pion elastic scattering amplitude at finite temperature to one-loop in chiral perturbation theory. The thermal scattering amplitude properly defined allows to generalize the perturbative unitarity relation to the T 0 0 case. [...]texto impreso
Llanes Estrada, Felipe José ; Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2005-01-27We discuss the thermal behaviour of the pion vector form factors and calculate them in one-loop chiral perturbation theory. The perturbative result is used to analyze the T dependent electromagnetic pion charge radius, obtaining a rough estimat[...]texto impreso
Within pNRQCD we compute the masses of spin-averaged triply heavy baryons using the now-available NNLO pNRQCD potentials and three-body variational approach. We focus in particular on the role of the purely three-body interaction in perturbation[...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Elsevier Science BV | 2010-10We examine the leading-N(c) behavior of the masses and transition matrix elements of some low-lying, few particle configurations in QCD. A truncation of the Fock space produces an effective, symmetric Hamiltonian that we diagonalize. The lowest [...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Steve ; General, Ignacio ; Wang, Ping | American Institute of Physics | 2008The Franck-Condon principle governing molecular electronic transitions is utilized to study heavy-quark hadron decays. This provides a direct assessment of the wavefunction of the parent hadron if the momentum distribution of the open flavor dec[...]texto impreso
We present an elementary method to obtain Green’s functions in non-perturbative quantum field theory in Minkowski space from Green’s functions calculated in Euclidean space. Since in non-perturbative field theory the analytical structure of ampl[...]texto impreso
Llanes Estrada, Felipe José ; Hidalgo Duque, Carlos ; Williams, Richard | J C B Mohr (Paul Siebeck) | 2013We examine the two solutions (massive and scaling) for the covariant Yang–Mills Dyson–Schwinger equations within stochastic quantization, and find that the scaling solution does not survive outside Landau gauge. We also see that the (rainbow) ma[...]texto impreso
In this review we highlight a few physical properties of neutron stars and their theoretical treatment inasmuch as they can be useful for nuclear and particle physicists concerned with matter at finite density (and newly, temperature). Conversel[...]texto impreso
Drutskoy, A. G. ; Llanes Estrada, Felipe José ; Guo, F. ; Nefediev, A.V. ; Torres Rincón, Juan Miguel | Springer | 2013-01We point out the physics opportunities of future high-luminosity B-factories at the Upsilon(5S) resonance and above. Currently the two B-factories, the SuperB factory in Tor Vergata, Italy and the Belle II factory in KEK, Japan, are under develo[...]texto impreso
Llanes Estrada, Felipe José ; Oset, E. ; Sarkar, S. ; Vicente Vacas, M.J. ; Mateu, V. ; Hyodo, T. | World Scientific Publ Co Pte Ltd | 2005In this talk I look into three different topics, addressing first the possibility that the Theta(+) is a bound state of K pi N, exploiting the results of this study to find out the contribution of two meson and one baryon components in the baryo[...]texto impreso
Llanes Estrada, Felipe José ; Torres Rincón, Juan Miguel ; Cabrera Urban, Daniel ; Abreu, Luciano M | Elsevier Science BV | 2013-09-20Charm and bottom transport coefficients in a medium constituted of light mesons, such as is formed in the hadronic phase of heavy-ion collisions, are obtained within an effective field theory approach implementing heavy-quark symmetry and chiral[...]texto impreso
Heavy hadrons containing heavy quarks (for example, Y mesons) feature a scale separation between the heavy-quark mass and the QCD scale that controls the effective masses of lighter constituents. As in ordinary molecules, the deexcitation of the[...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Stephen R ; Szczepaniak, Adam P ; Swanson, Eric S | American Physical Soc | 2004-09Meson spin splittings are examined within an effective Coulomb gauge QCD Hamiltonian incorporating chiral symmetry and a transverse hyperfine interaction necessary for heavy quarks. For light and heavy quarkonium systems the pseudoscalar-vector [...]texto impreso
Following a recent suggestion that the Theta(+) could be a KpiN bound state we perform an investigation under the light of the meson-meson and meson-baryon dynamics provided by the chiral Lagrangians and using methods currently employed to dynam[...]texto impreso
Llanes Estrada, Felipe José ; Bicudo, Pedro ; Cotanch, Stephen R | American Physical Soc | 2006-03-03We report an odderon Regge trajectory emerging from a field theoretical Coulomb gauge QCD model for the odd signature J(PC) (P=C=-1) glueball states. The trajectory intercept is clearly smaller than the Pomeron and even the omega trajectory's in[...]texto impreso
Llanes Estrada, Felipe José ; General, Ignacio J. ; Wang, Ping ; Cotanch, Stephen R. | Elsevier Science BV | 2007-09-30Highlights in the search for nonconventional (non-q.q) meson states are the ?1(1400) and ?1(1600) exotic candidates. Should they exist, mounting theoretical arguments suggest that they are tetraquark molecular resonances excitable by meson resca[...]texto impreso
Llanes Estrada, Felipe José ; Dobado González, Antonio ; Delgado López, Rafael | IOP publishing ltd | 2014-02The claimed finding of a light Higgs boson makes the minimal Standard Model unitary. Yet, we recall that the general low-energy dynamics for the minimal electroweak symmetry breaking sector with three Goldstone bosons and one light scalar is not[...]texto impreso
Estevez, Jonathan ; Llanes Estrada, Felipe José ; Martínez Fernández, Victor ; Pastor Gutierrez, Álvaro | Amer Physical Soc | 2020-12-22We present a new computation in a field-theoretical model of Coulomb-gauge QCD of the first radial and angular excitations of a qqq system in an SU(3) flavor-singlet state, Lambda(S). The traditional motivation for the study is that the absence [...]texto impreso
Llanes Estrada, Felipe José ; Brodsky, Stanley J ; Szczepaniak, Adam P | Americal Physical Society | 2009-02The local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared of the struck quark, a contribution which has no analog in hadro[...]texto impreso
Utilizing an effective QCD Coulomb gauge Hamiltonian with linear confinement specified by lattice, we report a relativistic many-body calculation for the light exotic and charmed hybrid mesons. The Hamiltonian successfully describes both quark a[...]texto impreso
Bicudo, Pedro ; Cardoso, Marco ; Llanes Estrada, Felipe José ; Van Cauteren, Tim | Amer Physical Soc | 2016-09-07We study the conjectured “insensitivity to chiral symmetry breaking” in the highly excited light baryon spectrum. While the experimental spectrum is being measured at JLab and CBELSA/TAPS, this insensitivity remains to be computed theoretically [...]texto impreso
Llanes Estrada, Felipe José ; Torres Rincón, Juan M. ; Abreu, Luciano M. ; Cabrera, Daniel ; Tolos, Laura | IOP publishing ltd | 2014We present effective-field-theory results with unitarized interactions on the D-meson transport coefficients in a gas populated by light mesons and baryons at finite temperature and baryochemical potential. The Fokker-Planck equation is used to [...]texto impreso
Results from an extensive relativistic many-body analysis utilizing a realistic effective QCD Hamiltonian are presented for the meson spectrum. A comparative numerical study of the BCS, Tamm-Dancoff (TDA), and RPA treatments provides new, signif[...]texto impreso
Using a field theoretical, QCD inspired Hamiltonian formulated in the Coulomb gauge, relativistic many-body calculations are reported which reproduce the semiquantitative features of the observed meson and lattice glueball spectrums. Dynamical c[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Physical Society | 2009-12We reexamine the possibility of employing the viscosity over entropy density ratio as a diagnostic tool to identify a Phase transition in hadron physics to the strongly coupled quark-gluon plasma and other circumstances where direct measurement [...]texto impreso
Abreu, Luciano M. ; Favero, Aline G. ; Llanes Estrada, Felipe José ; García Sanchez, Alejandro | Amer Physical Soc | 2019-12-17We discuss pure q (q) over bar axial-vector mesons in the Tamm-Dancoff approximation of the Coulomb-gauge QCD model from North Carolina State University. While recent studies have put emphasis in configuration mixing with open meson-meson channe[...]texto impreso
Llanes Estrada, Felipe José ; Gorchtein, Mikhail ; Szczepaniak, Adam P | American Physical Society | 2013-05-03We assess the two-photon exchange contribution to the Lamb shift in muonic hydrogen with forward dispersion relations. The subtraction constant (T) over bar (0, Q(2)) that is necessary for a dispersive evaluation of the forward doubly virtual Co[...]texto impreso
Lope Oter, Eva ; Windisch, Andreas ; Llanes Estrada, Felipe José ; Alford, Mark | IOP publishing ltd | 2019-08We contribute a publicly available set of tables and code to provide equations of state (EoS) for matter at neutron star densities. Our EoS are constrained only by input from hadron physics and fundamental principles, without feedback from neutr[...]texto impreso
Cohen, Thomas ; Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira Carrascal, Jacobo | American Physical Society | 2014-08-14We study the large N_c behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying m[...]texto impreso
Cohen, Thomas ; Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | American Physical Society | 2014-08-14We study the large Nc behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying me[...]texto impreso
Aparicio Resco, Miguel ; Cruz Dombriz, Álvaro de la ; Llanes Estrada, Felipe José ; Zapatero Castrillo, Víctor | Elsevier B.V. | 2016-09In the context of f(R) gravity theories, we show that the apparent mass of a neutron star as seen from an observer at infinity is numerically calculable but requires careful matching, first at the star’s edge, between interior and exterior solut[...]texto impreso
Aparicio Resco, Miguel ; Cruz Dombriz, Álvaro de la ; Llanes Estrada, Felipe José ; Zapatero Castrillo, Víctor | Elsevier B.V. | 2016-09In the context of ƒ (R) gravity theories, we show that the apparent mass of a neutron star as seen from an observer at infinity is numerically calculable but requires careful matching, first at the star’s edge, between interior and exterior solu[...]texto impreso
Llanes Estrada, Felipe José ; Oset, E. ; Mateu, V. ; Sarkar, S. ; Vicente Vacas, M.J. | World Scientific Publ Co Pte Ltd | 2004In this talk I look into three different topics, addressing first a method to determine the quantum numbers of the +, then exploiting the possibility that the + is a bound state of K N and in the third place I present results on a new resonant[...]texto impreso
A computation of the quotient of shear viscosity and entropy density, or the Kovtun, Son and Starinets (KSS) number eta/s, is performed in the non-relativistic and classical regime, first in chiral perturbation theory, and then in the SO(g + 1)I[...]texto impreso
Llanes Estrada, Felipe José ; Delgado López, Rafael ; Dobado González, Antonio | Springer | 2014-02-27By including the recently discovered Higgs-like scalar phi in the Electroweak Chiral Lagrangian, and using the Equivalence Theorem, we carry out the complete one-loop computation of the elastic scattering amplitude for the longitudinal component[...]texto impreso
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Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Physical Society | 2015-06-04We propose and theoretically study a possible new resonance caused by strong coupling between the Higgs-Higgs and the W_LW_L (Z_L Z_L) scattering channels, without regard to the intensity of the elastic interaction in either channel at low energ[...]texto impreso
We argue that three-quark excited states naturally group into quartets, split into two parity doublets, and that the mass splittings between these parity partners decrease higher up in the baryon spectrum. This decreasing mass difference can be [...]texto impreso
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effective field theory for the four experimentally known particles (W_L^±, Z_L, h) and its dispersion-relation based unitary extensi[...]texto impreso
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effectie field theory for the four experimentally known particles (W^(±)_(L), Z_(L), h) and its dispersion-relation based unitary ex[...]texto impreso
Brambilla, N. ; Eidelman, S. ; Foka, P. ; Gardner, S. ; Kronfeld, A. S. ; Alford, M. G. ; Alkofer, R. ; Butenschoen, M. ; Cohen, T. D. ; Erdmenger, J. ; Fabbietti, L. ; Faber, M. ; Goity, J. L. ; Ketzer, B. ; Lin, H. W. ; Llanes Estrada, Felipe José ; Meyer, H. B. ; Pakhlov, P. ; Pallante, E. ; Polikarpov, M. I. ; Sazdjian, H. ; Schmitt, A. ; Snow, W. M. ; Vairo, A. ; Vogt, R. ; Vuorinen, A. ; Wittig, H. ; Arnold, P. ; Christakoglou, P. ; Di Nezza, P. ; Fodor, Z. ; Garcia i Tormo, X. ; Hoellwieser, R. ; Janik, M. A. ; Kalweit, A. ; Keane, D. ; Kiritsis, E. ; Mischke, A. ; Mizuk, R. ; Odyniec, G. ; Papadodimas, K. ; Pich, A. ; Pittau, R. ; Qiu, J. W. ; Ricciardi, G. ; Salgado, C. A. ; Schwenzer, K. ; Stefanis, N. G. ; von Hippel, G. M. ; Zakharov, V. I. | Springer Verlag Berlin Heidelberg | 2014-10-21We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astr[...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Stephen R. ; Bicudo, Pedro J. ; Ribeiro, J. Emilio ; Szczepaniak, Adam | Elsevier Science BV | 2002-11-04Implementing many-body techniques successful in other fields, we report a glueball Regge trajectory emerging from diagonalizing a confining Coulomb gauge Hamiltonian for constituent gluons. Through a BCS vacuum ansatz and gap equation, the dress[...]texto impreso
Llanes Estrada, Felipe José ; Guo, F.-K. ; Hanhart, C. ; Cleven, M | American Institute of Physics | 2011The pion mass dependence of the pion vector form factor is investigated using the Omnes representation. Our prediction agrees with later lattice results quite well. The nice agreement of the pion mass dependence of the scattering lengths of the [...]texto impreso
We examine the quark mass dependence of the pion vector form factor, particularly the curvature (mean quartic radius). We focus our study on the consequences of assuming that the coupling constant of the ? to pions, g??? , is largely independent[...]texto impreso
Using a systematic expansion of the quark-antiquark Bethe Salpeter wave functions in the relativistic quark model and working to O(P-4) in the chiral limit, we are able to derive theoretical expressions relating the coefficients of the chiral La[...]texto impreso
We present and numerically solve a modified form of the equation of motion for a charged particle under the influence of an external force, taking into account the radiation reaction. This covariant equation is integro differential, as Dirac-Roh[...]texto impreso
Llanes Estrada, Felipe José ; Szczepaniak, Adam P. ; Londergan, J. T. | Polish Acad Sciences Inst Physics | 2009-08Recently we have shown that exclusive QCD photon-induced reactions at low Mandelstam-t are best described by Regge exchanges in the entire scaling region, and not only for low values of Bjorken- x. In this paper we explore this crucial Regge beh[...]texto impreso
A relativistic many-body calculation for an effective QCD Hamiltonians reported for exotic and charmed hybrid mesons. The nonexotic J(PC) = 1(--) charmonium spectrum now resolves the anonymous overpopulation of observed J/psi states. The exotic [...]texto impreso
We represent QCD at the hadronic scale by means of an effective Hamiltonian, H, formulated in the Coulomb gauge. As in the Nambu-Jona-Lasinio model, chiral symmetry is explicitly broken, however our approach is renormalizable and also includes c[...]texto impreso
We show how to fix the renormalization scale for hard scattering exclusive processes such as deeply virtual meson electroproduction by applying the BLM prescription to the imaginary part of the scattering amplitude and employing a fixed-t disper[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Sanz Cillero, Juan José | Springer | 2018-03-26We examine the production of W h and Zh pairs at the LHC in the context of a Strongly Interacting Symmetry Breaking Sector of the Standard Model. Our description is based on a non-linear Higgs Effective Theory, including only the Standard Model [...]texto impreso
We construct a model for the quark-gluon vertex of Landau gauge QCD. This is of twofold interest: on the one hand the quark-gluon interaction is at the heart of quark confinement, on the other hand it is a central element in hadron phenomenology[...]texto impreso
Carrasco Millán, Pedro ; García-Ferrero, M. Ángeles ; Llanes Estrada, Felipe José ; Porras Riojano, Ana ; Sánchez García, Esteban M. | Elsevier Science BV | 2018-05We deploy Shannon’s information entropy to the distribution of branching fractions in a particle decay. This serves to quantify how important a given new reported decay channel is, from the point of view of the information that it adds to the al[...]texto impreso
Llanes Estrada, Felipe José ; Dobado González, Antonio ; Torres Rincón, Juan M. | American Physical Society | 2013-09-12We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely sm[...]texto impreso
Manuel, Cristina ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Int School Advanced Studies | 2005-09We compute the mean free path and shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T, when the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL [...]texto impreso
We study the collisional aspects of jet quenching in a high-energy nuclear collision, especially in the final state pion gas. The jet has a large energy, and acquires momentum transverse to its axis more effectively by multiple soft collisions t[...]texto impreso
Ruiz Cembranos, José Alberto ; Villarrubia Rojo, Héctor ; Llanes Estrada, Felipe José ; Garay Elizondo, Luis Javier ; López Maroto, Antonio ; Fernández Sanz, David | 2018-06-19Esta memoria contiene los principales resultados del proyecto de innovación docente número 34 de la convocatoria 2017/2018 que lleva por título "Software libre como herramienta de aprendizaje en mecánica".texto impreso
García Fernández, Guillermo ; Guerrero Rojas, Jesús ; Llanes Estrada, Felipe José | Elsevier | 2017-02The gauge symmetry of the Standard Model is SU(3)_(c) x SU(2)_(L) x U(1)_(Y) for unknown reasons. One aspect that can be addressed is the low dimensionality of all its subgroups. Why not much larger groups like SU(7), or for that matter, SP(38) [...]texto impreso
García Fernández, Guillermo ; Guerrero Rojas, Jesús ; Llanes Estrada, Felipe José | Elsevier | 2019-12We point out an error in our previous work, that affects the claims made for the special Lie groups and for the SO(N-c) groups of lowest dimension, which are therefore retracted. Our earlier results stand for larger-dimension SO(N-c), as well as[...]texto impreso
Llanes Estrada, Felipe José ; Cabrera, Daniel ; Luciano M., Abreu ; Bratkovskaya, Elena ; Ramos, Angels ; Torres Rincón, Juan M. | IOP publishing ltd | 2014We present selected results on the properties of strange and heavy-flavoured mesons in a hot and dense nuclear medium, with emphasis in selfconsistent coupled-channel approaches based on the chiral Lagrangian. In the strangeness sector, we discu[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics (AIP) | 2016The apparent finding of a 125 GeV light Higgs boson would close the minimal Standard Model (SM), that is weakly interacting. This is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up to 700 G[...]texto impreso
Dobado González, Antonio ; Delgado López, Rafael ; Llanes Estrada, Felipe José | American Institute of Physics | 2014The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up [...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Elsevier Sciende BV | 2016-04Recently, a new boson h has been discovered at the LHC which, so far, is compatible with the properties of the SM Higgs. However, the SM is not the most general low-energy dynamics for the minimal electroweak symmetry breaking sector with three [...]texto impreso
Llanes Estrada, Felipe José ; Fischer, Christian S. ; Alkofer, Reinhard ; Cassing, Wolfgang ; Watson, Peter | Elsevier Science BV | 2006-03We summarise recent results on the properties of gluons, quarks and light mesons from the Green's functions approach to QCD. We discuss a self-consistent, infrared power law solution for the Schwinger-Dyson equations of the 1PI Greens functions [...]texto impreso
We analyze the f(0)(1810) state recently observed by the BES collaboration via radiative J/psi decay to a resonant phi omega spectrum and confront it with DM2 data and glueball theory. The DM2 group only measured omega omega decays and reported [...]texto impreso
Llanes Estrada, Felipe José ; Alkofer, Reinhard ; Fischer, Christian S ; Schwenzer, Kai | Academic Press Inc Elsevier Science | 2009-01The infrared behavior of the quark–gluon vertex of quenched Landau gauge QCD is studied by analyzing its Dyson Schwinger equation. Building on previously obtained results for Green functions in the Yang–Mills sector, we analytically derive the e[...]texto impreso
We evaluate the ratio of shear viscosity to entropy density in a pion gas employing the Uehling-Uehlenbeck equation and experimental phase-shifts parameterized by means of the SU(2) inverse amplitude method. We find that the ratio for this monoc[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2008In this work we briefly review the Kovtun-Son-Starinet (KSS) computation of the ratio eta/s for quantum field theories with gravitational dual and the related conjecture that it is bound from below by 1/4 pi. We discuss the validity of the bound[...]texto impreso
Gómez Nicola, Ángel ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics | 2003We report on our recent work about the description of a meson gas below the chiral phase transition within the framework of Chiral Perturbation Theory. As an alternative to the standard treatment, we present a calculation of the quark condensate[...]texto impreso
Dobado González, Antonio ; Gómez Nicola, Ángel ; Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón | Amer Physical Soc | 2002-11We study the temperature evolution of the rho and sigma mass and width, using a unitary chiral approach. The one-loop pipi scattering amplitude in chiral perturbation theory at Tnot equal0 is unitarized via the inverse amplitude method. Our resu[...]texto impreso
Llanes Estrada, Felipe José ; Hidalgo Duque, Carlos ; Delgado López, Rafael | Springer Wien | 2013-11Experimental verifications of confinement in hadron physics have established the absence of charges with a fraction of the electron's charge by studying the energy deposited in ionization tracks at high energies, and performing Millikan experime[...]texto impreso
Castillo, Andrés ; Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Springer | 2017-07-01By considering a non-linear electroweak chiral Lagrangian, including the Higgs, coupled to heavy quarks, and the equivalence theorem, we compute the one-loop scattering amplitudes W^(+)W^(?) ? t?, Z Z ? t? and hh ? t? (in the regime M^(2)_(t)/v^[...]texto impreso
Three decades of work on the quantum field equations of pure Yang-Mills theory have distilled two families of solutions in Landau gauge. Both coincide for hig (Euclidean) momentum with known perturbation theory, and both predict an infrared supp[...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Vicente Vacas, M.J. ; Oset, E ; Hosaka, A ; Hyodo, T | American Physical Soc | 2005-04We study the two-meson virtual cloud contribution to the self-energy of the SU(3) antidecuplet, to which the Thet (+) pentaquark is assumed to belong. This is motivated by the large branching ratio of the N(1710) decay into two pions and one nuc[...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Vicente Vacas, M. J. ; Oset, E. | Elsevier Science BV | 2005-06-13We study the self-energy of the SU(3) antidecuplet coming from two-meson virtual clouds. Assuming that the exotic Theta(+) belongs to an antidecuplet representation with (1710) as nucleon partner, we derive effective Lagrangians that describe t[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Amer Physical Soc | 2015-04-27If the electroweak symmetry breaking sector turns out to be strongly interacting, the actively investigated effective theory for longitudinal gauge bosons plus Higgs can be efficiently extended to cover the regime of saturation of unitarity (whe[...]texto impreso
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Chiral symmetry in QCD can be simultaneously in Wigner and Goldstone modes, depending on the part of the spectrum examined. The transition regime between both, exploiting for example the onset of parity doubling in the high baryon spectrum, can [...]texto impreso
The empirical identification of bound states of gluons has remained a central goal of hadron spectroscopy. We suggest an experimentally challenging, but model-independent way to assess which zero charge, isospin-zero mesons have a large gluonium[...]texto impreso
Llanes Estrada, Felipe José ; Martínez Carmona, Belén ; Muñoz Martínez, José L. | World Scientific Publ. Co. | 2016-02We propose event by event velocity fluctuations of nuclear fission fragments as an additional interesting observable that gives access to the nuclear temperature in an independent way from spectral measurements and relates the diffusion and fric[...]texto impreso
Llanes Estrada, Felipe José ; Martínez Carmona, Belén ; Muñoz Martínez, José L. | World Scientific Publ. Co. | 2016-02We propose event by event velocity fluctuations of nuclear fission fragments as an additional interesting observable that gives access to the nuclear temperature in an independent way from spectral measurements and relates the diffusion and fric[...]texto impreso
The infrared behaviour of vertex functions in an SU(N) Yang Mills theory in Landau gauge is investigated employing a skeleton expansion of the Dyson-Schwinger equations. The three- and four-gluon vertices become singular if and only if all exter[...]texto impreso
We report a calculation of the shear viscosity in a relativistic multicomponent meson gas as a function of temperature and chemical potentials. We approximately solve the Uehling-Uhlenbeck transport equation of kinetic theory, appropriate for a [...]texto impreso
Llanes Estrada, Felipe José ; Alkofer, R. ; Fischer, C. S. ; Schwenzer, K. | World Scientific Publ Co Pte Ltd | 2007-10The infrared behavior of Landau gauge QCD vertex functions is investigated employing a skeleton expansion of the Dyson Schwinger and Renormalization Group equations. Results for the ghost-gluon, three-gluon, four-gluon and quark-gluon vertex fun[...]texto impreso
Llanes Estrada, Felipe José ; Guo, F.-K ; Hanhart, C ; Meißner, U.-G | Elsevier Science BV | 2011-09-20Hadron masses show a specific dependence on the quark masses. Therefore, the variation of these masses can cause a resonance in a hadronic scattering amplitude to become a bound state. Consequently, the amplitude exhibits a non analytic behavior[...]texto impreso
The newly reported Y(4260) becomes the second most massive state in the charmonium family. We argue that it displaces the 4415 as the (largely) 4s vector charmonium state, recall s d wave interference to explain the lack of a signal in e e [...]