Models of Weak Interactions Mediated by Vector Bosons

1968 ◽  
Vol 173 (5) ◽  
pp. 1730-1733 ◽  
Author(s):  
G. Segrè
Keyword(s):  
Weak Interactions ◽  
Models Of Weak Interactions ◽  
Vector Bosons

A Gauge Theory for the Weak and Electromagnetic Interactions

2021 ◽  
pp. 388-404
Author(s):  
J. Iliopoulos ◽  
T.N. Tomaras
Keyword(s):  
Gauge Theory ◽  
Quark Model ◽  
Weak Interactions ◽  
Mass Matrix ◽  
Natural Source ◽  
Apparent Difference ◽  
Electromagnetic Interactions ◽  
Vector Bosons ◽  
Gim Mechanism ◽  
Intermediate Vector

In this chapter we develop the Glashow–Weinberg–Salam theory of electromagnetic and weak interactions based on the gauge group SU(2) × U(1). We show that the apparent difference in strength between the two interactions is due to the Brout–Englert–Higgs phenomenon which results in heavy intermediate vector bosons. The model is presented first for the leptons, and then we argue that the extension to hadrons requires the introduction of a fourth quark. We show that the GIM mechanism guarantees the natural suppression of strangeness changing neutral currents. In the same spirit, the need to introduce a natural source of CP-violation leads to a six quark model with the Cabibbo–Kobayashi–Maskawa mass matrix.

Introductory remarks about new particles

1977 ◽  
Vol 355 (1683) ◽  
pp. 443-445 ◽  
Keyword(s):  
Particle Physics ◽  
Direct Detection ◽  
Weak Interactions ◽  
Heavy Particle ◽  
New Era ◽  
Elementary Particle Physics ◽  
Electromagnetic Interactions ◽  
Vector Bosons ◽  
First Time ◽  
New Particles

On 11 November 1974, elementary particle physics entered a new era, with simultaneous announcements from the east and west coasts of America that a new heavy particle with astonishingly small decay width had been observed in two quite independent experiments, of different types. Since that time we have all been living through one of the most exciting periods which our field of research has known. The possibility that there might exist new particles of some kind, and possibly of more than one kind, was very much ‘in the air’ during the preceding year or so (Iliopoulos 1974). Attractive theoretical ideas had been put forward some years before (Weinberg 1967) suggesting that a finite gauge theory could be constructed for the weak interactions, which could achieve a unification of the weak and electromagnetic interactions, a goal long sought (Salam & Ward 1964). When a proof of this finiteness (renormalizability) was achieved by t’Hooft (1971 a , b ), physicists had for the first time calculable and meaningful theories unifying the weak and electromagnetic interactions, the analogue for the weak interactions to the photon for the electromagnetic field being very heavy vector bosons, both charged and neutral, whose direct detection still lies quite far in the future. However, not all such theories were necessarily finite. Further conditions had to be met, and a key feature of these is the situation concerning the neutral weak currents.

scholarly journals Astrophysical Consequences of the Existence of Charged Intermediate Vector Bosons

1968 ◽  
Vol 21 (2) ◽  
pp. 139 ◽  
Author(s):  
JA Campbell
Keyword(s):  
Weak Interactions ◽  
Vector Boson ◽  
Accurate Information ◽  
Coupling Constant ◽  
Evolutionary Time ◽  
Two Photon ◽  
Vector Bosons ◽  
Intermediate Vector ◽  
Photon Annihilation ◽  
Intermediate Vector Boson

Two-photon annihilation into a neutrino-antineutrino pair, which is forbidden to the lowest order in the coupling constant for weak interactions if the conventional form of weak interaction is assumed, is permitted at that order if it is supposed that the reaction is carried by a charged intermediate vector boson (W). The rate of loss of energy in stellar evolution through this process is calculated. Evolutionary time scales derived with and without this rate are compared with results from astronomical observations. Comparisons with present data are inconclusive, but further observations and calculations that may give more accurate information concerning the question of the existence of charged W mesons are suggested.

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