Showing papers on "Strangeness published in 1975"
TL;DR: In this article, the authors derived the time distribution of neutral kaon decay in material medium and discussed the essential effects of the medium which should be taken into account in the discussion of the bubble chamber experiments in which the ΔS=ΔQ rule and CP-violation are studied.
Abstract: Formulae for time distribution of neutral kaon decay in material medium are derived and discussed. Essential effects of the medium are emphasized which should be taken into account in the discussion of the bubble chamber experiments in which theΔS=ΔQ rule and CP-violation are studied.
74 citations
TL;DR: In this paper, the structure of parity violating ΔS = 0 weak non-leptonic amplitudes in a gauge theory of strong, weak and electromagnetic interactions based on the Weinberg-Salam theory with three quartets of fractionally charged quarks was studied.
45 citations
01 Jan 1975
TL;DR: In this paper, a review of the study of Λ-hypernuclei Λ A Z, where Z denotes the number of protons, Λ means that there is one Λ hyperon (M = 1115 MeV, J π, = ½ +, I = 0, S = -1), and Λ is the total number of baryons (protons + neutrons + lambda).
Abstract: Hypernuclei are nuclei in which at least one of the nuclear constituents is a hyperon, namely a baryon heavier than a nucleon and having a nonzero value of strangeness. In this review, discussion is limited to the study of Λ-hypernuclei Λ A Z, where Z denotes the number of protons, Λ means that there is one Λ-hyperon (M = 1115 MeV, J π , = ½ +, I = 0, S = -1), and Λ is the total number of baryons (protons + neutrons + lambda). Double A-hypernuclei ΛΛ A Z, containing two lambdas, have been shown to exist in a stable form for at least two species. However, experimental data for these exciting species is severely restricted at present to ground-state binding energies and we shall not discuss them thoroughly here.
28 citations
CERN1
TL;DR: In this article, it was shown that the purity violating amplitude for the decays Σ + → pγ and Ξ − → Σ − γ vanish in the SU(3) symmetry limit if the charged weak currents possess a U spin symmetry for strangeness changing processes.
17 citations
TL;DR: In this paper, three models which lead to a p.v. potential with different isospin dependence were proposed, including the Bose quark and colour Fermi quark models.
10 citations
10 citations
TL;DR: In this article, the authors show how the multi-Regge cluster model leads, through unitarity, to an equation relating the mean multiplicity of clusters to an expansion involving triple-regge (MMP) vertices.
4 citations
TL;DR: In this paper, the angular asymmetry of the photons emitted in the reaction n+p$Yields$d+$gamma$ are computed in a covariant formalism within the framework of a composite-particle theory of the deuteron.
4 citations
TL;DR: In this paper, the diffractive production of mesons is investigated in the presence of charmed quarks, and it is shown that available data are consistent with the SU(4) model.
Abstract: We assume that the newly discovered mesons psi(3.1) and psi(3.7) are nonrelativistic bound states of charmed quarks, and show that available data are consistent with this picture. We calculate the diffractive production of psi in the processes $gamma$A$Yields$psiA and $mu$A$Yields$$mu$psiA, where A is a proton or nucleus, and find a result which is different from the vector-meson-dominance prediction. We also calculate the reactions $nu$ (anti $nu$) A$Yields$$mu$ (anti $mu$) F*A, where F* denotes the hypothetical particle with both charm and strangeness which is predicted by the SU(4) model. Our result appears to be compatible with the excess of events (compared to the parton model) seen in the inclusive reactions $nu$A$Yields$$mu$$sup -$X and anti $nu$A$Yields$$mu$$sup +$X. (AIP)
4 citations
4 citations
TL;DR: In this article, the authors classify all possible SU(2) × U(1) gauge models with three triplet quarks according to the representations of the quarks, requiring the validity of the Cabibbo theory and absence of strangeness changing neutral processes in lowest order.
TL;DR: In this paper, a study of the leptonic coupling types in K+→π+l+l− (l = e, μ) provides a model-independent distinction between the various underlying mechanism: lowest order weak cum electromagnetic vs higher order weak interactions vs genuine strangeness-changing semileptonic neutral currents.
TL;DR: In this article, a finite energy sum rule for the reactions KN → πΛ and KN → Σ is evaluated in the narrow width resonance approximation. But this relation is only approximate for the tensor exchange.
TL;DR: In this paper, the average strangeness transfer computed for the K ± p interactions on the basis of the existing experimental data does not change appreciably in the 4 to 16 GeV/c beam momentum range, being negative for K + p and positive for K − p interactions.
TL;DR: Second-rank S-P-T interaction effects in inclusive muonless neutrino processes may show up as typical anomalies in y distributions and in the ν to ν ratio of total cross sections as discussed by the authors.
01 Jan 1975
TL;DR: The information one obtains from various experimental results regarding the origin of parity-violating effects in strangeness-conserving nonleptonic processes is discussed, and some theoretical ideas are reviewed as mentioned in this paper.
Abstract: The information one obtains from the various experimental results regarding the question of the origin of parity-violating effects in strangeness- conserving nonleptonic processes is discussed, and some theoretical ideas are reviewed that have recently been discussed in this connection. (JFP)
TL;DR: In this article, the authors discuss how recent experiments, with new accelerators and detectors, such as the ones at CERN and Fermi Lab, have shed new light on some of the fundamental questions regarding the weak interactions.
Abstract: Interest in neutrino physics has surged up recently, partly because the “little neutral ones” are being groomed for the job (for which they alone are qualified) of probing the interiors of stars. Among elementary particles the neutrino is unique. This is because—as far as we know—it alone interacts with other particles only through the Fermi, or weak, interaction. In this article we will discuss how recent experiments, with new accelerators and detectors, such as the ones at CERN and Fermi Lab, have shed new light on some of the fundamental questions regarding the weak interactions. We will review the recent discoveries of neutral weak currents that conserve strangeness, parity violation and point‐like neutrino collisions, as well as some of the implications of these experiments to particle theory.