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Showing papers on "Pseudoscalar published in 1976"


Journal ArticleDOI
TL;DR: In this paper, a pseudoclassical relativistic Lagrangian invariant under the former supersymmetry was constructed, which is a degenerate one and one of the constraints gives rise to the Dirac equation.
Abstract: In this work we consider a version of the supersymmetry parametrized by anticommuting pseudovector and pseudoscalar variables instead of spinorial ones. We construct a pseudoclassical relativistic Lagrangian invariant under the former supersymmetry. This Lagrangian is a degenerate one and we show that, after quantization, one of the constraints gives rise to the Dirac equation. Moreover, we introduce into our Lagrangian an interaction term with an external electromagnetic field, and we show that this is possible, in a consistent way, only if the anomalous magnetic moment is vanishing. It follows that this model represents a pseudoclassical description for the relativistic electron.

253 citations


Journal ArticleDOI
TL;DR: In this article, the one-pion exchange currents in momentum space are derived up to the order M −3 (M is a nucleon mass), and the pseudoscalar and pseudovector couplings in the pion-nucleon interaction are equivalent in a limited sense.

43 citations


Journal ArticleDOI
TL;DR: In this paper, an explicit formula for the beta-ray angular distribution is given by taking into account the radiative corrections, Coulomb corrections of the :finite-size nucleus, weak magnetis:rp, induced pseudoscalar, second-class induced tensor, and contributions of the d-wave leptons.
Abstract: An explicit. formula for beta-ray . angular distribution. in the decay of polarized nuclei is given by taking into account the radiative corrections, Coulomb corrections of the :finite-size nucleus, weak magnetis:rp, induced pseudoscalar, second-class induced tensor, and contributions of the d-wave'leptons. Generally speaking, the radiative corrections ~re aJmost the same for Po (cosO) and P1 (cosO) terms. In particular, the . logarit:(?.mi<:! divergence disappears for the asymmetry factor in the case, of the Gamow­ Teller transitions. And the effeet of the induced pseudoscalar current is extremely small. Experimental data on the beta decays of polarized 1'2B and 12N are carefully

36 citations


Journal ArticleDOI
TL;DR: In this article, the J/subP/=0/sup -/ partial waves of the Kpi pi pi.. system in the reactions K/sup plus-or-minus/p.
Abstract: The J/subP/=0/sup -/ partial waves of the K..pi pi.. system in the reactions K/sup plus-or-minus/p..-->..K/sup plus-or-minus/..pi../sup +/..pi../sup -/p at 13 GeV are presented. Structure in intensities and relative phase variations suggest the existence of a pseudoscalar resonance, the K', with a mass of approx.1400 MeV and a width of approx.250 MeV decaying predominantly into epsilonK. (AIP)

36 citations


Journal ArticleDOI
TL;DR: In this paper, a small but significant mixing of η and η′ with the pseudoscalar cc state may explain the large Ϸ and Ϸ′ masses, the small mass of the new 2.8 GeV state, the large rates for ψ′ → ψη, ψ → ηγγ, and the large number of photons in ψ decay.

34 citations


Journal Article
TL;DR: In this paper, it was shown that SU (4) symmetry breaking due to the increased mass of the s and c quarks can lead to an appreciable fraction of two-particle lepton lepton decays of heavy (charmed) pseudoscalar mesons.
Abstract: It is indicated that SU (4) symmetry breaking due to the increased mass of the s and c quarks can lead to an appreciable fraction of two-particle lepton decays of heavy (charmed) pseudoscalar mesons. The difference between the experimental values of the vector and axial Cabibbo factors can be explained within the framework of the developed model. (AIP)

28 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that a realistic quark model is consistent with current experimental evidence on the magnetic dipole decays of the vector and pseudoscalar mesons.
Abstract: It is shown that a realistic quark model is consistent with current experimental evidence on the magnetic dipole decays of the vector and pseudoscalar mesons. (AIP)

25 citations


Journal ArticleDOI
Harald Fritzsch1
TL;DR: In this article, strong PCAC and a generalization of Dashen's relation for the K + −K 0 mass difference were used to obtain insight into the mechanism which causes the mass splitting among the charmed pseudoscalar mesons D + and D 0.

15 citations


Journal ArticleDOI
TL;DR: In this paper, the quark-vector-gluon model was used to obtain a consistent picture of symmetry breaking in the pseudoscalar nonet, with chiral symmetry broken by a quark mass term and careful use of algebraic properties of the Hamiltonian and of the divergences of axial-vector currents.
Abstract: In the framework of the quark-vector-gluon model, with chiral symmetry broken by a quark mass term, careful use of the algebraic properties of the Hamiltonian and of the divergences of axial-vector currents leads to a consistent picture of symmetry breaking in the pseudoscalar nonet. The ${\ensuremath{\eta}}^{\ensuremath{'}}(960)$ emerges with a large gluon component.

12 citations


Journal ArticleDOI
TL;DR: In this article, the M1 vector meson electromagnetic decays for recoil effects of the final pseudoscalar and for several smaller effects, using results from the FKR and bag models of meson structure.

9 citations


Journal ArticleDOI
TL;DR: The MIT bag model is used to compute certain electromagnetic and weak leptonic decay rates of the pseudoscalar and vector mesons as mentioned in this paper, and it is found that generally the results are not in good agreement with experiment.
Abstract: The MIT bag model is used to compute certain electromagnetic and weak leptonic decay rates of the pseudoscalar and vector mesons. Because of the limitations inherent in the cavity approximation it is found that generally the results are not in good agreement with experiment. (AIP)

Journal ArticleDOI
TL;DR: The theory of action-at-a-distance interaction between objects of two dimensions is studied in this paper, which has some similarities to the corresponding theory of one-dimensional objects (strings).
Abstract: The theory of action‐at‐a‐distance interaction between objects of two dimensions is studied. The theory developed has some similarities to the corresponding theory of one‐dimensional objects (strings). The fundamental invariants of the theory are found. A particular interaction is studied, and it is found that the interaction between closed membranes takes place via a pseudoscalar field.

Journal ArticleDOI
TL;DR: In this paper, a possible explanation of the ψ-particles is presented in the context of Han-Nambu colour theory, which is assumed that both SU3 subgroups break to SU2×U1, which implies a fourth ψparticle coupled directly to the photon.
Abstract: A possible explanation of the ψ-particles is presented in the context of Han-Nambu colour theory. The strong group is taken to beSU3′×SU3″ and it is proposed that there are vector mesons in the (1, 1), (8, 1), (1, 8) and (8, 8) representations. It is assumed that bothSU3 subgroups break toSU2×U1, which implies a fourth ψ-particle coupled directly to the photon. A provisional parametrization on the basis of Okubo-type mass formulae suggests a mass for this particle about 4.8 GeV/c2. The theory also predicts charged coloured vector mesons ρC,D/+,− with the same mass as ψ(3.1) and ψ(3.7) and coloured mesons KC,D/*+,−,0 with masses approximately 3.9 GeV/c2 and 4.5 GeV/c2. Coloured pseudoscalar mesons πC,D have decay properties similar toρC,D. They do not couple directly to the photon but are accessible from ψ1,2 by radiative transitions and provide a possible explanation of the new state at 3.5 GeV/c2. We also develop in this framework a renormalizable theory of weak and electromagnetic interactions with hadronic currents with the necessary group-theoretic and observed hypercharge-changing properties. These requirements together with « universality » are sufficient to determine the theory almost uniquely. Its implications for coloured particles are examined and it is shown that the only long-lived coloured vector mesons is KC/*+ (orρC/+ in the alternative version) with mean life about 10−13 s.

Journal ArticleDOI
TL;DR: In this paper, a new approach to the problem of SU(3) symmetry in leptonic decays of pseudoscalar mesons is proposed, where the four-velocity of a single hadron can be regarded as SU (3) invariant.

Journal ArticleDOI
TL;DR: In this article, the electromagnetic mass difference of the pseudoscalar and vector mesons is calculated in the bag model, and the mass difference is shown to be 7.82 MeV and 6.81 MeV, respectively.
Abstract: The electromagnetic mass differences of the pseudoscalar and vector mesons are calculated in the bag model. The electromagnetic mass difference of the charmed pseudoscalar (D) is predicted to be 7.82 MeV; and that of the D*, 6.81 MeV. (AIP)

Journal ArticleDOI
TL;DR: In this article, a simple dynamical model is used to calculate the partial rate for various decay modes of charmed pseudoscalar and vector mesons, and the results together with the presently available data lend support to the hypothesis that the lowest-lying charmed particles are vector meson.
Abstract: A simple dynamical model is used to calculate the partial rate for various decay modes of charmed pseudoscalar and vector mesons. Our results together with the presently available data lend support to the hypothesis that the lowest-lying charmed particles are vector mesons. It is suggested that the multiparticle state K/sup -/..pi../sup +/..pi../sup -/..pi../sup +/ should be produced fairly copiously in charmed-vector-meson decays, which could offer a fruitful way of identifying charm. (AIP)

Journal ArticleDOI
TL;DR: In this article, the two-photon decays of the pseudoscalar mesons are studied in terms of the fundamental quark-antiquark annihilation amplitude, and the similarity of the mesons to parapositronium is stressed.
Abstract: The two-photon decays of the pseudoscalar mesons are studied in terms of the fundamental quark-antiquark annihilation amplitude. The similarity of the pseudoscalars to parapositronium is stressed. In particular, it is shown that the atomic physics result for the decay width of parapositronium, modified in certain cases to accommodate strong-binding effects, is applicable to these hadrons and leads to values for their two-photon widths which are in accord with experimental results. (AIP)

Journal ArticleDOI
TL;DR: In this paper, the mixing of eta, eta', and eta/sub c/ is calculated in a cylinder dominated model and the results are applied to the hadronic decay psi'..-->.. psi eta and a number of photonic decays, using vector meson dominance.
Abstract: The mixing of eta, eta', and eta/sub c/ is calculated in a cylinder dominated model and the results are applied to the hadronic decay psi' ..-->.. psi eta and a number of photonic decays, using vector meson dominance. The results are in excellent agreement with all experimental data.

Journal ArticleDOI
TL;DR: In this article, a mass relation for pseudoscalar mesons is obtained in a broken-chiral SU(4) -symmetry scheme, where an interesting property of the chimeral SU (4) group and the Goldstone nature of some of the pseudo-calars in certain symmetry limits are exploited for the derivation of the relation.
Abstract: A mass relation for pseudoscalar mesons is obtained in a broken-chiral-SU(4) -symmetry scheme. An interesting property of the chimeral SU(4) group and the Goldstone nature of some of the pseudoscalar mesons in certain symmetry limits are exploited for the derivation of the relation. (AIP)

Journal ArticleDOI
TL;DR: In this paper, the pseudoscalar mesons in the framework of broken chiral SU(4) SU (4) symmetry were studied and the symmetry-breaking Hamiltonian was realized in the Goldstone-Nambu way.
Abstract: We study the pseudoscalar mesons in the framework of broken chiral SU(4) SU(4) symmetry when the symmetry-breaking Hamiltonian, HSB, is taken as –(u0 + cu8 + du15) and the symmetry of the Hamiltonian is realized in Goldstone-Nambu way An interesting property of two chimeral SU(4) subgroups and the Goldstone nature of some of the pseudoscalar mesons in certain symmetry limits are exploited to obtain some mass relations and the ratio c/d

Journal ArticleDOI
TL;DR: In this article, the axial-vector current and axial vector current-pseudoscalar field were used to study axialvector mass spectrum and mixing angles, as well as the decay constants and mixing angle of the pseudoscalar mesons.

Journal ArticleDOI
TL;DR: The Lovelace-Veneziano model for pseudoscalar-meson process PP → PP was considered in this article with particular attention to the problematical requirement of ideal mixing for the pseudo-calar nonet.
Abstract: The Lovelace-Veneziano model for the pseudoscalar-meson process PP → PP is considered with particular attention to the problematical requirement of ideal mixing for the pseudoscalar nonet. A solution to the problem which retains the narrow-resonance approximation for this process is found.

Journal ArticleDOI
S.G. Kamath1
TL;DR: In this article, the Harari quark model is used to analyse the radiative decays of the narrow resonances in the spirit of an earlier investigation for the “old” mesons due to Van Royen and Weisskopf.

Journal ArticleDOI
TL;DR: In this article, a model for SU(3) breaking in ψ decays is proposed, where the quark-antiquark pair which comprises the ψ annihilates via a Zweig rule violating interaction to create a pair of ordinary quarks.