Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV
- University of Michigan, Ann Arbor, Michigan 48109 (United States)
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Indiana University, Bloomington, Indiana 47405 (United States)
- Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
- Purdue University, West Lafayette, Indiana 47907 (United States)
Cross sections are presented for the inclusive production of {Lambda} hyperons in electron-positron annihilations at {radical}{ital s} =29 GeV based on the full 291-pb{sup {minus}1} sample of data taken in the High Resolution Spectrometer experiment at the SLAC {ital e}{sup +}{ital e}{minus} storage ring PEP. These results, and the associated correlation analyses, are consistent with the Lund model predictions with the strange diquark suppression ratio {delta} fixed at 0.59{plus minus}0.10{plus minus}0.18, as compared to the standard Lund value of 0.32. The {Lambda} multiplicity has been found to be 0.182{plus minus}0.020 per event. The opposite-strangeness multiplicity {l angle}{ital n}{sub {Lambda}}{Lambda}{bar a}{r angle} has been measured to be 0.046{plus minus}0.020, whereas the like-strangeness multiplicity {l angle}{ital n}{sub {Lambda}{Lambda}}+{bar {Lambda}}{bar {Lambda}}{r angle} is 0.009{plus minus}0.028. A strong correlation is found between {Lambda}'s and {bar {Lambda}} 's; when one is found in an event, the other is found in the same event with a probability that exceeds 50%.
- DOE Contract Number:
- AC02-84ER40125
- OSTI ID:
- 7106361
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 45:11; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
LAMBDA PARTICLES
PARTICLE PRODUCTION
BARYONS
CROSS SECTIONS
FRAGMENTATION
GEV RANGE 10-100
INCLUSIVE INTERACTIONS
LUMINOSITY
MULTIPLICITY
PEP STORAGE RINGS
QUARKS
SPECTROMETERS
STRANGENESS
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
HADRONS
HYPERONS
INTERACTIONS
LAMBDA BARYONS
LEPTON-LEPTON INTERACTIONS
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POSTULATED PARTICLES
STORAGE RINGS
STRANGE PARTICLES
662310* - Weak & Electromagnetic Interactions of Leptons- (1992-)