Transverse Spin Physics at COMPASS

Abstract

The investigation of transverse spin and transverse momentum effects in deep inelastic scattering is one of the key physics programs of the COMPASS collaboration. Three channels have been analyzed at COMPASS to access the transversity distribution function: The azimuthal distribution of single hadrons, involving the Collins fragmentation function, the azimuthal dependence of the plane containing hadron pairs, involving the two-hadron interference fragmentation function, and the measurement of the transverse polarization of Lambda hyperons in the final state. Azimuthal asymmetries in unpolarized semi-inclusive deep-inelastic scattering give important information on the inner structure of the nucleon as well, and can be used to estimate both the quark transverse momentum k_T in an unpolarized nucleon and to access the so-far unmeasured Boer-Mulders function. COMPASS has measured these asymmetries using spin-averaged 6LiD data.

Proceedings of QCD10 conference, Montpellier

References in corpus (8)

• The COMPASS Experiment at CERN
• Measurement of the Collins and Sivers asymmetries on transversely polarised protons
• Semi-Inclusive Deep Inelastic Scattering processes from small to large P_T
• A systematic phenomenological study of the $\cos 2\varphi$ asymmetry in unpolarized semi--inclusive DIS
• Transverse momentum dependence of the quark helicity distributions and the Cahn effect in double-spin asymmetry $A_{LL}$ in Semi Inclusive DIS
• Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS
• Transversity from two pion interference fragmentation
• Transverse-momentum dependent functions in semi-inclusive DIS

Cited by in corpus (1)

• The $\sin 2\varphi$ azimuthal asymmetry in single longitudinally polarized $\pi N$ Drell-Yan process