Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)2<Q2<10 (GeV/c)2, Bjorken scaling variable 0.003<xBj<0.3 and transverse momentum squared of the ω meson View the MathML source. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs HT that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.
Exclusive ω meson muoproduction on transversely polarised protons
BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;CHATTERJEE, CHANDRADOY;Dalla Torre, S.;DASGUPTA, SHUDDHA SHANKAR;DUIC, VENICIO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;MATOUSEK, JAN;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;SZABELSKI, ADAM;TAKEKAWA, STEFANO;TESSARO, SUSANNA;Tessarotto, F.;
2017-01-01
Abstract
Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)2File | Dimensione | Formato | |
---|---|---|---|
2017_npb915_454.pdf
accesso aperto
Descrizione: Articolo
Tipologia:
Documento in Versione Editoriale
Licenza:
Creative commons
Dimensione
701.05 kB
Formato
Adobe PDF
|
701.05 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.