Longitudinal spin transfer to the {lambda} hyperon in semiinclusive deep-inelastic scattering

Journal Article · Sun Oct 01 04:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.072004· OSTI ID:20871281

Airapetian, A; Deconinck, W; Lorenzon, W ^[1]; Akopov, N; Akopov, Z; Avakian, R; Avetissian, A; Elbakian, G; Gharibyan, V; Marukyan, H; Rostomyan, A; Taroian, S ^[2]; Amarian, M ^[3]; Andrus, A; Bailey, P; Bouwhuis, M; Chiang, H C; Linden-Levy, L A; Makins, N C. R.; Rubin, J ^[4]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States)
2. Yerevan Physics Institute, 375036 Yerevan (Armenia)
3. DESY, 15738 Zeuthen (Germany)
4. Department of Physics, University of Illinois, Urbana, Illinois 61801-3080 (United States)

The transfer of polarization from a high-energy positron to a {lambda}{sup 0} hyperon produced in semiinclusive deep-inelastic scattering has been measured. The data have been obtained by the HERMES experiment at DESY using the 27.6 GeV longitudinally polarized positron beam of the HERA collider and unpolarized gas targets internal to the positron (electron) storage ring. The longitudinal spin-transfer coefficient is found to be D{sub LL{sup '}}{sup {lambda}}=0.11{+-}0.10(stat){+-}0.03(syst) at an average fractional energy carried by the {lambda}{sup 0} hyperon <z>=0.45. The dependence of D{sub LL{sup '}}{sup {lambda}} on both the fractional energy z and the fractional longitudinal momentum x{sub F} is presented.

• OSTI ID: 20871281
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEEP INELASTIC SCATTERING
ELECTRONS
GEV RANGE
HERA STORAGE RING
LAMBDA BARYONS
LONGITUDINAL MOMENTUM
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
POLARIZATION
POLARIZED BEAMS
POSITRON BEAMS
POSITRONS
SEMI-INCLUSIVE INTERACTIONS
SPIN