Polarization and forward-backward asymmetry of Λ baryons in hadronic Z ⁰ decays

1997/08/19 by The OPAL Collaboration, K. Ackerstaff, K. Ackerstaff et al · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1007/s100520050123

published as Eur.Phys.J.C2:49-59,1998 · 22 pages, LaTeX, uses a4p.sty, 5 eps figures included, submitted to Zeit. Phys. C

arxiv created 1997/08/19 · openalex publication_date 1998/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of Lambda baryons have been measured using a sample of 4.34 million hadronic Z⁰ decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. Significant longitudinal polarization has been observed at intermediate and high momentum. For x_E = 2 E_Lambda/√(s)) > 0.3, the longitudinal polarization has been measured to be -32.9 +/- 5.5(stat) +/- 5.2(syst)%. We have observed no transverse polarization. A significant forward-backward asymmetry has been measured and can be described by a JETSET model.

Citations

• A Program for Baryon Generation and Its Applications to Baryon Fragmentation in DIS

Cited by

• Structure and production of lambda baryons
• q→Λ fragmentation function and nucleon transversity distribution in a diquark model
• Evidence for SU(3) symmetry breaking from hyperon production