Transversity distributions from difference asymmetries in semi-inclusive DIS

Abstract

In recent years information on the transversity distribution $h_1$ has been obtained combining the Collins asymmetry results from semi-inclusive deep inelastic scattering (SIDIS) data on transversely polarized nucleon targets with the information on the fragmentation function of a transversely polarized quark from the asymmetries measured in $e^{+}{e}^{-}$ annihilation into hadrons. An alternative method was proposed long time ago, which does not require the $e^{+}{e}^{-}$ data, but allows one to get ratios of the $u$ and $d$ quark transversity distributions from the SIDIS data alone. The method utilizes the ratio of the difference of the Collins asymmetries of positively and negatively charged hadrons produced on transversely polarized proton and deuteron targets. We have applied this method to the COMPASS proton and deuteron data, and extracted the ratio $h_1^d/h_1^u$. The results are compared to those obtained in a previous point--by--point extraction based both on SIDIS and $e^{+}{e}^{-}$ data.

7 pages, 4 figures

References in corpus (8)

• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• The COMPASS Experiment at CERN
• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at \sqrt{s} = 10.58 GeV
• Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes
• The Polarised Valence Quark Distribution from semi-inclusive DIS
• Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs
• Extracting the transversity distributions from single-hadron and dihadron production
• NLO QCD method of the polarized SIDIS data analysis

Cited by in corpus (1)

• On the extraction of the valence transversity distributions from SIDIS data