Lifetimes of SU(3) groups and psi particles as a scaling in powers of. cap alpha

Journal Article · Sun Feb 01 04:00:00 EST 1976 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.13.574· OSTI ID:7362278

Mac Gregor, M H

A study of the experimental systematics of elementary particle lifetimes leads to the following conclusions: (a) Elementary particle lifetimes tau divide empirically into two distinct groups: ''particles'' (tau > 10/sup -21/ sec) and ''resonances'' (tau < 10/sup -22/ sec), where ''particle'' lifetimes are spaced by powers of ..cap alpha.. = e/sup 2// h c and ''resonance'' lifetimes occur as a continuum of values; (b) the scaling of ''particle'' lifetimes in powers of ..cap alpha.. is a ''lifetime democracy'' in the sense that baryons, mesons, and leptons, are all grouped together in one over-all lifetime scaling pattern; (c) integral-spin boson ''particle'' lifetimes scale in powers of ..cap alpha.., whereas half-integral-spin fermion ''particle'' lifetimes scale in powers of ..cap alpha../sup 2/; (d) an SU(3) grouping of lifetimes reveals some striking patterns, with the psi and psi' lifetimes appearing as an extension of one of these patterns; (e) phase-space corrections, which are important for ''resonance'' lifetimes, are not as important for ''particle'' lifetimes; (f) if hadron lifetimes are grouped according to baryon number and strangeness, and then sorted into spin states, an empirical spin and lifetime correlation is seen in all of these groups: As the spin value increases, the maximum observed lifetime decreases. (AIP)

• Research Organization: Lawrence Livermore Laboratory, Livermore, California 94550
• NSA Number: NSA-33-31376
• OSTI ID: 7362278
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 13:3; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645201* -- High Energy Physics-- Particle Interactions &amp; Properties-Theoretical-- General &amp; Scattering Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
DECAY
ELEMENTARY PARTICLES
HADRONS
HALF-LIFE
LIE GROUPS
LIFETIME
MESON RESONANCES
MESONS
PARTICLE PROPERTIES
PARTICLE WIDTHS
PSI RESONANCES
PSI-3105 RESONANCES
PSI-3695 RESONANCES
RESONANCE PARTICLES
SOMMERFELD CONSTANT
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS
VECTOR MESONS