Selection Rules in the Weak Interactions and Their Relation to Hadronic Mesons
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概要
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In the framework of a model of weak interactions developed in a previous work, we consider selection rules in weak interactions. The isospin selection rules |ΔI|=1 and |ΔI|=1/2 are consequences of our model. We classify the hadronic vector and axialvector mesons into first and second class mesons similar to S. Weinberg's classification of first and second class currents, thus giving physical meaning to notions of first and second class currents. We derive the conclusion that the existence of second class currents depends on the following points: 1) Existence of "second class" mesons. As a candidate we cite B meson: I^GJ^P=1^+1^+, m=1220Mev. 2) Existence of vector (axialvector) mesons with isospin 2. 3) Existence of neutral leptonic currents. Here the ω and φ mesons would give the main contributions. We discuss the relation of the electromagnetic currents of the hadrons to the vector part of the neutral weak currents of the hadrons. We assume these two currents to be the sameand conclude from this that the possible existence of the isotensor electromagnetic currents which have been investigated by several authors in recent years is directly related to the possible existence of |ΔI|=2 weak processes or to the possible existence of mesons with isospin 2. This assumption leads to an "extended" C.V.C. in the sense that the isospin relation between the electromagnetic and weak currents is not limited to the isovector but extended to the isoscalar and isotensor.
- 理論物理学刊行会の論文
- 1971-07-25
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関連論文
- A Model of Leptonic Weak Interactions
- Selection Rules in the Weak Interactions and Their Relation to Hadronic Mesons