The production of vector mesons in deep inelastic scattering is an interesting yet scarcely explored channel to study the transverse spin structure of the nucleon and the spin-dependence of fragmentation. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced ρ0 mesons. The analysis is based on the data set collected in deep inelastic scattering in 2010 using a 160GeV/c μ+ beam impinging on a transversely polarized NH3 target. The ρ0 mesons are selected from oppositely charged hadron pairs, and the asymmetries are extracted as a function of the Bjorken-x variable, the transverse momentum of the pair and the fraction of the energy z carried by the pair. Indications for positive Collins and Sivers asymmetries are observed.

Original languageEnglish
Article number137950
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Aug 2023


FundersFunder number
Daiko and Yamada Foundations
National Science FoundationPHY-1506416
National Science Foundation
Univerzita Karlova v PrazePRIMUS/22/SCI/017
Univerzita Karlova v Praze
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 TělovýchovyLM2015058, LM2018104, LTT17018
Ministerstvo Školství, Mládeže a Tělovýchovy
Fundação para a Ciência e a TecnologiaCERN/FIS-PAR/0016/2021, CERN/FIS-PAR/0022/2019
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Israel Academy of Sciences and Humanities
LabexANR-10-LABX-0038, ANR-11-IDEX-0003-01
Narodowe Centrum Nauki2020/37/B/ST2/01547
Narodowe Centrum Nauki
Ministry of Science and Technology, Taiwan
Università degli Studi del Piemonte Orientale
Horizon 2020824093
Horizon 2020


    • Collins asymmetry
    • Fragmentation
    • SIDIS
    • Sivers asymmetry
    • Spin


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