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19 papers · 1 filter
Constraints on singlet right-handed neutrinos coming from the -width
C. O. Escobar, O. L. G. Peres, V. Pleitez +1
We study the constraints on masses and mixing angles imposed by the measured invisible width, in a model in which a singlet right-handed neutrino mixes with all the Standard…
Approximately Finite C*-Algebras and Partial Automorphisms
Ruy Exel
We prove that every AF-algebra is isomorphic to a crossed product of a commutative AF-algebra by a partial automorphism. The case of UHF-algebras is treated in detail.
Attractive Forces Between Electrons in QED
H. O. Girotti, M. Gomes, J. L. deLyra +3
Vacuum polarization effects are non-perturbatively incorporated into the photon propagator to eliminate the severe infrared problems characteristic of QED. The theory is thus r…
Threshold Effects on Heavy Quark Production in Interactions
O. J. P. Eboli, M. C. Gonzalez-Garcia, F. Halzen +1
The exchange of gluons between heavy quarks produced in interactions results in an enhancement of their production near threshold. We study QCD threshold effects in c…
The Algebra of the Energy-Momentum Tensor and the Noether Currents in Classical Non-Linear Sigma Models
M. Forger, J. Laartz, U. Schaeper
The recently derived current algebra of classical non-linear sigma models on arbitrary Riemannian manifolds is extended to include the energy-momentum tensor. It is found that in t…
Stable diquark matter ?
J. E. Horvath
Two-quark correlations ({\it diquarks}) may play an important role in hadronic physics, particularly near the deconfinement point. This opens the possibility of a net energy gain b…