Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.3949· OSTI ID:7106361

Geld, T L; Neal, H; Akerlof, C; Chapman, J; Errede, D; Ken, M T; Kesten, P; Meyer, D I; Nitz, D; Thun, R; Tschirhart, R ^[1]; Abachi, S; Derrick, M; Kooijman, P; Musgrave, B; Price, L; Repond, J; Sugano, K ^[2]; Blockus, D; Brabson, B B ; Brom, J; Jung, C; Ogren, H; Rust, D R; Snyder, A ^[3]; Cork, B ^[4]; Baringer, P; Bylsma, B G; Debonte, R; Low, E H; McIlwain, R L; Miller, D H; Ng, C R; Rangan, K; Shibata, E ^[5]

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1. University of Michigan, Ann Arbor, Michigan 48109 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Indiana University, Bloomington, Indiana 47405 (United States)
4. Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
5. 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), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:11; ISSN 0556-2821; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

662310* -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BARYONS
BASIC INTERACTIONS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FRAGMENTATION
GEV RANGE
GEV RANGE 10-100
HADRONS
HYPERONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LAMBDA BARYONS
LAMBDA PARTICLES
LEPTON-LEPTON INTERACTIONS
LUMINOSITY
MEASURING INSTRUMENTS
MULTIPLICITY
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PEP STORAGE RINGS
PHYSICAL PROPERTIES
POSTULATED PARTICLES
QUARKS
SPECTROMETERS
STORAGE RINGS
STRANGE PARTICLES
STRANGENESS