New measurement of. sigma. decay properties and a test of the vertical-bar. delta. I vertical-bar=1/2 rule

Journal Article · Thu May 01 04:00:00 EDT 1980 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.21.2501· OSTI ID:5470724

Marraffino, J; Reucroft, S; Roos, C E; Waters, J; Webster, M; Manz, A; Settles, R; Wolf, G

We report on new measurements of the ..sigma../sup +/ and ..sigma../sup -/ lifetimes, the ..sigma../sup +/ nonleptonic-decay branching ratio, and the ratio of the ..sigma../sup +/ decay asymmetry parameters ..cap alpha../sub +//..cap alpha../sub 0/. The final results obtained are tau/sup +/0.798=(ts +- 0.005) x 10/sup -10/ sec, tau/sup -/1.480=(ts +- 0.014) x 10/sup -10/ sec, R=GAMMA(..sigma../sup +/ ..-->.. p..pi../sup 0/)/GAMMA(..sigma../sup +/ ..-->.. all)=0.5172 +- 0.0036, and ..cap alpha../sub +//..cap alpha../sub 0/=-0.073 +- 0.021. These results together with the world average for ..cap alpha../sub 0/ areused to perform a test of the vertical-bar ..delta..I vertical-bar=1/2 rule.

• Research Organization: Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235
• OSTI ID: 5470724
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 21:9; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ASYMMETRY
BARYONS
BRANCHING RATIO
BUBBLE CHAMBERS
CERN PS SYNCHROTRON
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
FERMIONS
GAS TRACK DETECTORS
HADRONS
HYPERONS
LIFETIME
MEASURING INSTRUMENTS
PARTICLE DECAY
PHASE SHIFT
RADIATION DETECTORS
SIGMA MINUS
SIGMA PARTICLES
SIGMA PLUS
STRANGE PARTICLES
SYNCHROTRONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY