Studies of Partonic Transverse Momentum and Spin Structure of the Nucleon at HERMES

Journal Article · Fri Oct 21 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3647433· OSTI ID:21611959

Contalbrigo, Marco ^[1]

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1. INFN Ferrara - Via Saragat 1 - 44100 Ferrara (Italy)

The investigation of the partonic degrees of freedom beyond collinear approximation (3D description) has been gained increasing interest in the last decade. At the HERMES experiment, azimuthal single-spin asymmetries of pions and charged kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons off a transversely (polarized) hydrogen and deuterium target have been measured. Such asymmetries provide new insights on crucial aspects of the parton dynamics. By measuring various hadron types in the initial and final states, flavor sensitivity is achieved. Evidence is reported of the poorly known transversity function and of naive-T-odd transverse-momentum-dependent parton distribution functions related to spin-orbit effects. Evidence of spin-orbit effects in quark fragmentation is also observed, which are opposite in sign for favored and disfavored processes.

• OSTI ID: 21611959
• Journal Information: AIP Conference Proceedings, Vol. 1388, Issue 1; Conference: BARYONS' 10: International conference on the structure of baryons, Osaka (Japan), 7-11 Dec 2010; Other Information: DOI: 10.1063/1.3647433; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
ASYMMETRY
DEEP INELASTIC SCATTERING
DEUTERIUM TARGET
DISTRIBUTION FUNCTIONS
ELECTRON-NUCLEON INTERACTIONS
FLAVOR MODEL
HELICITY
HERA STORAGE RING
HYDROGEN 1 TARGET
KAONS
PIONS
POLARIZED TARGETS
POSITRON REACTIONS
QUARKS
SPIN
TRANSVERSE MOMENTUM
ANGULAR MOMENTUM
BOSONS
CALCULATION METHODS
COMPOSITE MODELS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MESONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUARK MODEL
SCATTERING
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
TARGETS