Hard exclusive measurements with a polarised target at HERMES
نویسندگان
چکیده
منابع مشابه
Transverse-Target Single-Spin Azimuthal Asymmetry in Hard Exclusive Electroproduction of Single Pions at HERMES
We present the analysis of data taken in the years 2002-2004 with the 27.56 GeV positron beam of the HERA storage ring at DESY and the internal transversely polarised hydrogen fixed target of the HERMES experiment. Events with a scattered positron and a produced pion are selected. Exclusive production of single pions, e+p → e+′nπ+, is ensured by requiring the missing mass in the event to be equ...
متن کاملHERMES Measurements of Collins and Sivers Asymmetries from a transversely polarised Hydrogen Target
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of πmesons and charged K-mesons in deep-inelastic scattering of positrons and electrons on a transversely polarised hydrogen target were observed. Significant SSA amplitudes for both the Collins and the Sivers mechanism are presented for the full data set recorded with transverse target polarisation at the HERMES experi...
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mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q2 > 1.0 GeV2, 3.0 GeV < W < 6.3 GeV, and −t ′ < 0.2 GeV2, while for ρ0-meson production on a transversely polarized hydrogen target −t ′ < 0.4 GeV2 is used. Spin-density matrix elements for ω production are presented in projections of Q2 or −t ′, while the ratios of the helicity amplitudes for the reacti...
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Kenntnisse kann jedermann haben – aber die Kunst zu denken, ist das seltenste Geschenk der Natur. des Impulsübertrags verbessern kann.
متن کاملTransversity measurements at HERMES
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of charged pions in deep-inelastic scattering (DIS) of positrons on a transversely polarised hydrogen target are presented. Azimuthal moments for both the Collins and the Sivers mechanism are extracted. In addition the subleading-twist contribution due to the transverse spin component from SSA on a longitudinally polari...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2008
ISSN: 1742-6596
DOI: 10.1088/1742-6596/110/2/022034