Transverse spin dependent azimuthal asymmetries at COMPASS

Abstract

In semi-inclusive deep inelastic scattering of polarized leptons on a transversely polarized target eight target transverse spin-dependent azimuthal modulations are allowed. In the QCD parton model half of these asymmetries can be interpreted within the leading order approach and the other four are twist-three contributions. The first two leading twist asymmetries extracted by HERMES and COMPASS experiments are related: one to the transversity distribution and the Collins effect, the other to the Sivers distribution function. These results triggered a lot of interest in the past few years and allowed the first extractions of the transversity and the Sivers distribution functions of nucleon. The remaining six asymmetries were obtained by the COMPASS experiment using a 160 GeV/c longitudinally polarized muon beam and transversely polarized deuteron and proton targets. Here we review preliminary results from COMPASS proton data of 2007.

5 pages, 4 figures, Proceedings of SPIN2010 international symposium, Jülich, Germany, September 27 - October 2, 2010

References in corpus (8)

• The COMPASS Experiment at CERN
• Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering
• Update on transversity and Collins functions from SIDIS and e+ e- data
• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at \sqrt{s} = 10.58 GeV
• Transverse momentum dependent parton distributions in a light-cone quark model
• Measurement of the Collins and Sivers asymmetries on transversely polarised protons
• Azimuthal spin asymmetries in light-cone constituent quark models
• Predictions for double spin asymmetry A_{LT} in Semi Inclusive DIS

Cited by in corpus (11)

• The Spin Structure of the Nucleon
• Beam-Target Double Spin Asymmetry A_LT in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized He-3 Target at 1.4<Q^2<2.7 GeV^2
• Extraction of the distribution function $h_{1T}^{\perp }$ from experimental data
• Six "beyond Collins and Sivers" transverse spin asymmetries at COMPASS
• Transverse spin azimuthal asymmetries in SIDIS at COMPASS: Multidimensional analysis
• Double Sivers effect asymmetries and their impact on transversity measurements at RHIC
• New results on transverse spin asymmetries from COMPASS
• SIDIS transverse spin azimuthal asymmetries at COMPASS: Multidimensional analysis
• Polarized Drell-Yan at COMPASS-II: Transverse Spin Physics Program
• Kotzinian-Mulders effect in semi-inclusive DIS within TMD factorization
• Single/Double-Spin Asymmetry Measurements of Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target through Deep Inelastic Scattering