Browsing Exact and Earth Sciences by Subject "Fisica de particulas elementares e campos"
Now showing items 21-40 of 42
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Excitation rates of heavy quarks
(1985) [Journal article]We obtain the production rates for c, b, and t quarks in deep-inelastic neutrino- (antineutrino-) nucleon interactions, in the standard six-quark model with left-handed couplings. ,The results are obtained with the most ... -
Hamiltonian formulation of QED in the superaxial gauge
(1982) [Journal article]We present a hamlltonian formulation of QED in a fully fixed axial gauge. The equal-time commutators for all field variables are computed and are shown to lead to the correct equations of motion. The constraints and gauge ... -
Investigating the central diffractive f0(980) and f0(1270) meson production at the LHC
(2012) [Journal article]The central diffractive production of mesons f0ð980Þ and f2ð1270Þ at the energy of CERN-Large Hadron Collider experiment on proton-proton collisions is investigated. The processes initiated by quasireal photon-photon ... -
J/(psi) suppression in electro-and hadroproduction : a conventional physics explanation
(1994) [Journal article]Having in mind the importance of the phenomenon for the search for the quark-gluon plasma in the collision of heavy nuclei, we study the suppression of J/Ψ production in leptoproduction and hadroproduction on heavy nuclear ... -
Low energy limit of the chern-simons theory coupled to fermions
(1997) [Journal article]We study the nonrelativistic limit of the theory of a quantum Chern-Simons field minimally coupled to Dirac fermions. To get the nonrelativistic effective Lagrangian one has to incorporate vacuum polarization and anomalous ... -
Manifestly covariant approach for the one-soliton sector
(1978) [Journal article]The one-loop contributions to the meson propagator and to the meson-soliton scattering amplitude in the one-soliton sector are analyzed using ordinary Feynman rules. It is found that, at the level of the propagator, the ... -
Momentum space saturation model for deep inelastic scattering and single inclusive hadron production
(2011) [Journal article]We show how the Santana Amaral-Gay Ducati-Betemps-Soyez (AGBS) model, originally developed for deep inelastic scattering applied to HERA data on the proton structure function, can also describe the RHIC data on single ... -
Neutral current neutrino-nucleus interactions at high energies
(2009) [Journal article]We present a QCD analysis of the neutral current (NC) neutrino-nucleus interaction at the small-x region using the color dipole formalism. This phenomenological approach is quite successful in describing experimental results ... -
Photon plus heavy-quark production in high-energy collisions within the target rest frame formalism
(2010) [Journal article]We apply the target rest frame formalism to photon þ heavy quark production cross section in hadronic collisions at high energies. We investigate the dependence of the production cross section on the photon and quark ... -
Poincaré invariance of a quantized duality symmetric theory
(1997) [Journal article]The noncovariant duality symmetric action put forward by Schwarz and Sen is quantized by means of the Dirac brackets quantization procedure. The resulting quantum theory is shown to be, nevertheless, relativistically ... -
QCD evolution of the gluon density in a nucleus
(1997) [Journal article]The Glauber approach to the gluon density in a nucleus, suggested by A. Mueller, is developed and studied in detail. Using the GRV parameterization for the gluon density in a nucleon, the value as well as energy and Q2 ... -
Quantization of gauge-invariant theories through the dirac-bracket formalism
(1981) [Journal article]A physical system possessing first-class constraints is quantized by using the Dirac-bracket formalism. The main features of this quantization procedure are analyzed. The model enables us to present a situation where ... -
Quantum dynamics of chiral fermions in a model with anomalous breaking of gauge invariance
(1986) [Journal article]We study the quantum dynamics of chiral fermion fields minimally coupled to a gauge field. The model, originally proposed by Jackiw and Rajaraman, is known to exhibit the anomalous breaking of gauge invariance, which leads ... -
Quantum phase transitions in Bose–Einstein condensates from a Bethe ansatz perspective
(2012) [Journal article]We investigate two solvable models for Bose–Einstein condensates and extract physical information by studying the structure of the solutions of their Bethe ansatz equations. A careful observation of these solutions for the ... -
Reply to comment on "attractive forces bertween electrons in (2+1) - dimensional-qed"
(1993) [Journal article] -
Saturating field configurations for the massless thirring-wess model
(1979) [Journal article]The saturation of the massless Thirring-Wess model by induced field configurations is presented. The limiting procedure connecting the massless Thirring-Wess model arith the Schwinger model is reexamined. Special emphasis ... -
Saturation of the massive Schwinger model
(1980) [Journal article]We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ... -
Some comments about a static-localized solution for the massive thirring model
(1977) [Journal article]We derive the stability equation for a static-localized solution of the two-dimensional massive Thirring model. The corresponding eigenvalue spectrum is determined and compared with the eigenvalue spectrum of the stability ... -
The DLLA limit of BFKL in the dipole picture
(1998) [Journal article]In this work we obtain the DLLA limit of BFKL in the dipole picture and compare it with HERA data. We demonstrate that in leading – logarithmic – approximation, where a is fixed, a transition between the BFKL dynamics and ... -
The fermion-fermion effective potential in the maxwell-chern-simons theory
(1992) [Journal article]The effective nonrelativistic potential VT describing the fermion-fermion interaction in the Maxwell-Chern-Simons theory is derived to the lowest order in perturbation theory. As expected, VT is not invariant under parity ...
