New results on transverse spin asymmetries from COMPASS

Abstract

One of the important objectives of the COMPASS experiment is the exploration of transverse spin structure of nucleon via spin (in)dependent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS) of polarized leptons (and soon also Drell-Yan (DY) reactions with ${\pi }^{-}$) off transversely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and polarized ${}^{6}LiD$ and $N{H}_3$ targets and are foreseen with 190 GeV/c ${\pi }^{-}$ beam on polarized $N{H}_3$. The experimental results obtained by COMPASS for azimuthal effects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon and are widely used in theoretical analyses and global data fits. Future first ever polarized DY-data from COMPASS compared with SIDIS results will open a new chapter probing general principles of QCD TMD-formalism. In this review main focus will be given to the very recent COMPASS results obtained for SIDIS transverse spin asymmetries from four "Drell-Yan" $Q^2$-ranges.

arXiv comment7 pages, 12 figures, "Transversity-2014"-conference

References in corpus (15)

• The complete tree-level result up to order $1/Q$ for polarized deep-inelastic leptoproduction
• Semi-inclusive deep inelastic scattering at small transverse momentum
• New Quark Distributions and Semi-Inclusive Electroproduction on Polarized Nucleons
• QCD Evolution of the Sivers Asymmetry
• On the analysis of lepton scattering on longitudinally or transversely polarized protons
• Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries
• Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
• TMD Evolution: Matching SIDIS to Drell-Yan and W/Z Boson Production
• Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries
• Predictions for double spin asymmetry A_{LT} in 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
• Azimuthal asymmetries of charged hadrons produced by high-energy muons scattered off longitudinally polarised deuterons
• New target transverse spin dependent azimuthal asymmetries from COMPASS experiment
• Six "beyond Collins and Sivers" transverse spin asymmetries at COMPASS
• Transverse spin dependent azimuthal asymmetries at COMPASS

Cited by in corpus (1)

• Polarized Drell-Yan at COMPASS-II: Transverse Spin Physics Program