skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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%.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ;  [2]; ; more »; ; ; ; ;  [3];  [4]; ; ; ; ; ; ; ; ;  [5] « less
  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)
Publication Date:
OSTI Identifier:
7106361
DOE Contract Number:  
AC02-84ER40125
Resource Type:
Journal Article
Journal Name:
Physical Review, D (Particles Fields); (United States)
Additional Journal Information:
Journal Volume: 45:11; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 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-)

Citation Formats

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, Abachi, S, Derrick, M, Kooijman, P, Musgrave, B, Price, L, Repond, J, Sugano, K, Blockus, D, Brabson, B B, Brom, J, Jung, C, Ogren, H, Rust, D R, Snyder, A, Cork, B, Baringer, P, Bylsma, B G, Debonte, R, Low, E H, McIlwain, R L, Miller, D H, Ng, C R, Rangan, K, Shibata, E, and HRS Collaboration). Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV. United States: N. p., 1992. Web. doi:10.1103/PhysRevD.45.3949.
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, Abachi, S, Derrick, M, Kooijman, P, Musgrave, B, Price, L, Repond, J, Sugano, K, Blockus, D, Brabson, B B, Brom, J, Jung, C, Ogren, H, Rust, D R, Snyder, A, Cork, B, Baringer, P, Bylsma, B G, Debonte, R, Low, E H, McIlwain, R L, Miller, D H, Ng, C R, Rangan, K, Shibata, E, & HRS Collaboration). Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV. United States. https://doi.org/10.1103/PhysRevD.45.3949
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, Abachi, S, Derrick, M, Kooijman, P, Musgrave, B, Price, L, Repond, J, Sugano, K, Blockus, D, Brabson, B B, Brom, J, Jung, C, Ogren, H, Rust, D R, Snyder, A, Cork, B, Baringer, P, Bylsma, B G, Debonte, R, Low, E H, McIlwain, R L, Miller, D H, Ng, C R, Rangan, K, Shibata, E, and HRS Collaboration). 1992. "Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV". United States. https://doi.org/10.1103/PhysRevD.45.3949.
@article{osti_7106361,
title = {Study of inclusive. Lambda. production in e sup + e minus annihilations at 29 GeV},
author = {Geld, T L and Neal, H and Akerlof, C and Chapman, J and Errede, D and Ken, M T and Kesten, P and Meyer, D I and Nitz, D and Thun, R and Tschirhart, R and Abachi, S and Derrick, M and Kooijman, P and Musgrave, B and Price, L and Repond, J and Sugano, K and Blockus, D and Brabson, B B and Brom, J and Jung, C and Ogren, H and Rust, D R and Snyder, A and Cork, B and Baringer, P and Bylsma, B G and Debonte, R and Low, E H and McIlwain, R L and Miller, D H and Ng, C R and Rangan, K and Shibata, E and HRS Collaboration)},
abstractNote = {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%.},
doi = {10.1103/PhysRevD.45.3949},
url = {https://www.osti.gov/biblio/7106361}, journal = {Physical Review, D (Particles Fields); (United States)},
issn = {0556-2821},
number = ,
volume = 45:11,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1992},
month = {Mon Jun 01 00:00:00 EDT 1992}
}