Showing papers on "Mass formula published in 1987"
TL;DR: In this paper, the authors measured the topological charge density of the Monte Carlo generated SU(3) vacuum in a range of couplings 5.6 ⩽ β ≡ 6/g2⩽ 6.0 and on lattice sizes up to 164.
96 citations
TL;DR: In this paper, the authors developed an approach to the nuclear mass formula based on the Skyrme-ETF method with shell corrections calculated by the Strutinsky integral method of Chu, Jennings and Brack.
34 citations
TL;DR: In this article, the mass range for the beautiful baryons λ b, σ b and σ ∗ b was discussed and lower bounds on the masses of other baryon types were obtained.
22 citations
TL;DR: In this article, a fully microscopic actinide mass formula was derived using the fermion dynamical symmetry model approximation to the spherical shell model, and the mass formula fits the masses of 322 nuclei with an RMS deviation of 0.34 MeV.
9 citations
TL;DR: In this paper, a simple mass formula is given to relate the masses of the vector and pseudoscalar mesons, from the lightest π, ϱ mesons to the heaviest.
Abstract: In the constituent quark model, a simple mass formula is given to relate the masses of the vector and pseudoscalar mesons. Good agreement is obtained for all mesons, from the lightest π, ϱ mesons to the heaviest. In the limit of vanishing pion mass, alower limit of 230 MeV is obtained for the constituent quark mass.
6 citations
TL;DR: In this article, the zitterbewegung of the hadronic Dirac particle is given a visual representation by solving the two-component difference form of the Dirac equation and it is seen that the space-time trajectory of an electron can be seen as a correlated whole of a network of zigzags of left and righthanded chiral neutrinolike line elements.
Abstract: The zitterbewegung of the Dirac particle is given a visual representation by solving the two-component difference form of the Dirac equation. It is seen that the space-time trajectory of a Dirac particle can be pictured as a correlated whole of a network of zigzags of left- and righthanded chiral neutrinolike line elements. These zigzags can feel the curl of the external electromagnetic vector potential and give rise to the spin magnetic interaction, confirming Schrodinger’s earlier intuitive picture of the spin as the orbital angular momentum of the zitterbewegung. The network of zigzags associated with an electron splits and reunites in passing through the slits in the electron beam interference experiment. It is proposed to interpret Nambu’s empirical mass formulamn=(n/2)137me=(n/2)(ħ/cL),n=integer, as a radiationless condition for the zitterbewegung of the hadronic Dirac particle of the linear spatial extension of the order of the classical electron radiusL=e2/mec2.
3 citations
TL;DR: The glueball condensate vacuum model is extended to incorporate the effects of light quarks, and has a new kind of collective excitations, pions, which are distinct from the usual bag-model-type states.
Abstract: The glueball condensate vacuum model is extended to incorporate the effects of light quarks. The resulting model exhibits spontaneous breaking of chiral SU(2)/sub f/ symmetry, and has a new kind of collective excitations, pions, which are distinct from the usual bag-model-type states. The dynamics of the pions are described by a sigma model, and the parameters and f/sub ..pi../ are calculated in terms of the radius R of the vacuum cells. The pion mass is related to and m/sub q/ via the usual partial conservation of axial-vector current relation. The model is extended to broken SU(3)/sub f/ using lowest-order chiral perturbation theory, and a mass formula for the eta' meson is obtained by including effects of the axial anomaly.
1 citations
01 Jan 1987
01 Jan 1987
TL;DR: In this article, the authors discuss the possibility of magnetic dipole resonances in the e+e-system just above the two-body threshold, and examine the assumptions underlying this model more precisely, the nature of the neglected terms, a simple derivation and interpretation of the mass formula and the possible of other higher mass sharp resonances.
Abstract: In this lecture I discuss the possibility of magnetic dipole resonaces in the e+e--system just above the two-body threshold. Wong and Becker1have recently applied this idea in order to explain the positron peak observed in heavy-ion collisions2. Can the e+e--system form a magnetic resonance with mass around M≅3m and a width of about τ~10-18sec.? I shall examine the assumptions underlying this model more precisely, the nature of the neglected terms, a simple derivation and interpretation of the mass formula and the possibility of other higher mass sharp resonances in the (e+e-)-system.
01 Jan 1987
TL;DR: In this paper, an approach to the mass formula based on the extended Thomas-Fermi method with Strutinsky shell corrections for extrapolating from known to unknown nuclei far from the stability line is presented.
Abstract: We present an approach to the mass formula based on the extended Thomas-Fermi method with Strutinsky shell corrections For extrapolating from known to unknown nuclei far from the stability line it is essentially as accurate as the Hartree-Fock method for a given form of force, but is so much faster that the construction of a complete mass table is feasible Results of preliminary fits are presented