Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions h1q are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of Λ hyperons produced in SIDIS off transversely polarised nucleons, where the transverse polarisation of the struck quark might be transferred to the final-state hyperon. In this article, we present the COMPASS results on the transversity-induced polarisation of Λ and Λ¯ hyperons produced in SIDIS off transversely polarised protons. Within the experimental uncertainties, no significant deviation from zero was observed. The results are discussed in the context of different models taking into account previous experimental results on h1u and h1d.

Original languageEnglish
Article number136834
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Jan 2022


FundersFunder number
Daiko and Yamada Foundations
National Science FoundationPHY-1506416
National Science Foundation
Seventh Framework Programme283286
Seventh Framework Programme
European Commission
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science18002006, 20540299, 26247032, 18540281
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Ministerstvo Školství, Mládeže a TělovýchovyLM20150581
Ministerstvo Školství, Mládeže a Tělovýchovy
Fundação para a Ciência e a TecnologiaCERN/FIS-PAR/0022/2019, CERN/FIS-PAR/0007/2017
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Israel Academy of Sciences and Humanities0.1764
Israel Academy of Sciences and Humanities
LabexANR-10-LABX-0038, ANR-11-IDEX-0003-01
Narodowe Centrum Nauki2017/26/M/ST2/00498
Narodowe Centrum Nauki
Ministry of Science and Technology, Taiwan


    • Deep inelastic scattering
    • Lambda polarisation
    • Quantum chromodynamics
    • Transversity


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