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 [...]