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The interactions in K{sub μ3} and K{sub e3} decay

Abstract

An attractive feature common to all present theories of weak interactions is the assumption that they result from the coupling (either direct or via intermediate bosons) of vector-axial vector currents. The V-A coupling of leptonic currents and baryonic currents conserving strangeness successfully explains the characteristic properties of μ-decay, π-decay and μ-decay. On the other hand, the leptonic decay modes of K-mesons provide the best source of information on the nature of the currents carrying strangeness. From K{sub μ2} one learns that there must exist an axial-vector current carrying strangeness; further, if the leptonic weak interaction is universal, one can explain the absence of the K{sub e2} mode by excluding a pseudo-scalar interaction. From K{sub μ3} and K{sub e3} decay one can obtain information on scalar, vector and tensor coupling of strangeness non-conserving currents with leptons. In recent experiments on K{sub e3} decay a good fitting of the pion spectrum was obtained with a constant vector form factor. Although regarding this result as strong evidence of pure vector coupling, one might still argue that other possibilities, such as a mixture of vector and tensor couplings with energy-dependent form factors, are not excluded. I shall discuss here, in the first place, some  More>>
Authors:
McDowell, S. W. [1] 
  1. Brazilian Centre of Research in Physics, Rio de Janeiro (Brazil)
Publication Date:
Jan 15, 1963
Product Type:
Conference
Resource Relation:
Conference: Seminar on Theoretical Physics, Trieste (Italy), 16 Jul - 25 Aug 1962; Other Information: 9 refs., 8 figs., 1 tab.; Related Information: In: Theoretical Physics. Lectures presented at the Seminar on Theoretical Physics| 650 p.
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AXIAL-VECTOR CURRENTS; BARYONS; DISPERSION RELATIONS; ENERGY DEPENDENCE; FORM FACTORS; INFORMATION; INTERMEDIATE BOSONS; KAONS; LEPTONIC DECAY; LEPTONS; PIONS; SPECTRA; STRANGENESS; TRANSITION AMPLITUDES
OSTI ID:
22568138
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA17M0069012296
Submitting Site:
INIS
Size:
page(s) 619-629
Announcement Date:
Feb 25, 2017

Citation Formats

McDowell, S. W. The interactions in K{sub μ3} and K{sub e3} decay. IAEA: N. p., 1963. Web.
McDowell, S. W. The interactions in K{sub μ3} and K{sub e3} decay. IAEA.
McDowell, S. W. 1963. "The interactions in K{sub μ3} and K{sub e3} decay." IAEA.
@misc{etde_22568138,
title = {The interactions in K{sub μ3} and K{sub e3} decay}
author = {McDowell, S. W.}
abstractNote = {An attractive feature common to all present theories of weak interactions is the assumption that they result from the coupling (either direct or via intermediate bosons) of vector-axial vector currents. The V-A coupling of leptonic currents and baryonic currents conserving strangeness successfully explains the characteristic properties of μ-decay, π-decay and μ-decay. On the other hand, the leptonic decay modes of K-mesons provide the best source of information on the nature of the currents carrying strangeness. From K{sub μ2} one learns that there must exist an axial-vector current carrying strangeness; further, if the leptonic weak interaction is universal, one can explain the absence of the K{sub e2} mode by excluding a pseudo-scalar interaction. From K{sub μ3} and K{sub e3} decay one can obtain information on scalar, vector and tensor coupling of strangeness non-conserving currents with leptons. In recent experiments on K{sub e3} decay a good fitting of the pion spectrum was obtained with a constant vector form factor. Although regarding this result as strong evidence of pure vector coupling, one might still argue that other possibilities, such as a mixture of vector and tensor couplings with energy-dependent form factors, are not excluded. I shall discuss here, in the first place, some properties of the transition amplitudes which are independent of the structure of form factors. They provide a test of universality and a criterion for unambiguous determination of the nature of the weak interaction involved in these processes. Secondly, I shall discuss the structure of form factors, by means of dispersion relations and introducing explicitly the effect of the K*-resonance in the Kπ-interaction.}
place = {IAEA}
year = {1963}
month = {Jan}
}