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Azimuthal asymmetries of charged hadrons produced by high-energy muons scattered off longitudinally polarised deuterons.
- Source :
- European Physical Journal C -- Particles & Fields; Dec2010, Vol. 70 Issue 1/2, p39-49, 11p
- Publication Year :
- 2010
-
Abstract
- zimuthal asymmetries in semi-inclusive production of positive ( h) and negative hadrons ( h) have been measured by scattering 160 GeV muons off longitudinally polarised deuterons at CERN. The asymmetries were decomposed in several terms according to their expected modulation in the azimuthal angle φ of the outgoing hadron. Each term receives contributions from one or several spin and transverse-momentum-dependent parton distribution and fragmentation functions. The amplitudes of all φ-modulation terms of the hadron asymmetries integrated over the kinematic variables are found to be consistent with zero within statistical errors, while the constant terms are nonzero and equal for h and h within the statistical errors. The dependencies of the φ-modulated terms versus the Bjorken momentum fraction x, the hadron fractional momentum z, and the hadron transverse momentum $p_{h}^{T}$ were studied. The x dependence of the constant terms for both positive and negative hadrons is in agreement with the longitudinal double-spin hadron asymmetries, measured in semi-inclusive deep-inelastic scattering. The x dependence of the sin φ-modulation term is less pronounced than that in the corresponding HERMES data. All other dependencies of the φ-modulation amplitudes are consistent with zero within the statistical errors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14346044
- Volume :
- 70
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- European Physical Journal C -- Particles & Fields
- Publication Type :
- Academic Journal
- Accession number :
- 55266686
- Full Text :
- https://doi.org/10.1140/epjc/s10052-010-1461-9