1. Transversity distributions from difference asymmetries in semi-inclusive DIS
- Author
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A. Kerbizi, Jan Matousek, Vincenzo Barone, G. Sbrizzai, Andrea Bressan, Alan D. Martin, Franco Bradamante, Andrea Moretti, Barone, V., Bradamante, F., Bressan, A., Kerbizi, A., Martin, A., Moretti, A., Matousek, J., and Sbrizzai, G.
- Subjects
Quark ,Particle physics ,Proton ,media_common.quotation_subject ,Nuclear Theory ,Hadron ,FOS: Physical sciences ,01 natural sciences ,Asymmetry ,SIDIS ,Computer Science::Digital Libraries ,High Energy Physics - Phenomenology (hep-ph) ,Compass ,0103 physical sciences ,difference asymmetrie ,010306 general physics ,Nuclear Experiment ,media_common ,Spin-½ ,Physics ,Annihilation ,010308 nuclear & particles physics ,Deep inelastic scattering ,High Energy Physics - Phenomenology ,Transverse plane ,Distribution (mathematics) ,Deuterium ,High Energy Physics::Experiment ,Nucleon - 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., Comment: 7 pages, 4 figures
- Published
- 2019