Recent results from Mark II at SPEAR and PEP
Three results are presented: (1) The semi-leptonic branching ratio of the ..lambda../sub c/ has been measured at SPEAR to be B(..lambda../sub c//sup +/ ..-->.. e/sup +/X) = (4.5 +- 1.7)%. (2) Properties of tau-pair production have been measured at PEP at square root S = 29 GeV: sigma/sup tau tau//sigma/sup QED/ = 0.97 +- 0.05 +- 0.06; the forward-backward asymmetry is A/sub tau tau/ = (-3.5 +- 5.0)%; inclusive branching ratios are B(tau ..-->.. 1 Prong) = (86 +- 4)%, B(tau ..-->.. 3 Prongs) = (14 +- 4)%, B(tau ..-->.. 5 Prongs) < 0.6% (95% C.L.). (3) A search has been performed for the pair production of charged, point-like, spin 0 particles. The existence of such particles can be ruled out at a 90% confidence level for 3 approx. < M approx. < 10 GeV/c/sup 2/ and branching ratio into hadrons approx. < 90%.
- Research Organization:
- Stanford Linear Accelerator Center, CA (USA); Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00615; W-7405-ENG-48
- OSTI ID:
- 5165926
- Report Number(s):
- SLAC-PUB-2914; LBL-14392; CONF-820371-3; ON: DE82016169; TRN: 82-014331
- Resource Relation:
- Conference: 17. Recontre de Moriond meeting, Les Arcs, Savoie, France, 14 Mar 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LAMBDA PARTICLES
SEMILEPTONIC DECAY
TAU PARTICLES
PAIR PRODUCTION
SCALAR MESONS
ANGULAR DISTRIBUTION
ASYMMETRY
GEV RANGE 01-10
GEV RANGE 10-100
PEP STORAGE RINGS
PERFORMANCE
RADIATION DETECTORS
SPEAR
INCLUSIVE INTERACTIONS
BARYONS
BOSONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
HADRONS
HEAVY LEPTONS
HYPERONS
INTERACTIONS
LEPTONS
MEASURING INSTRUMENTS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
STORAGE RINGS
STRANGE PARTICLES
WEAK PARTICLE DECAY
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties