نتایج جستجو برای: polarised target
تعداد نتایج: 400491 فیلتر نتایج به سال:
We discuss model-independent inequalities for the spin observables in the reaction p̄p → ΛΛ, which have been measured at CERN with a polarised proton target.
Single-spin asymmetries have been measured for semi-inclusive electroproduction of π+, π−, π0 and K+ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle φ around the virtual photon direction, relative to the lepton scattering plane. The corresponding analysing powers in the sinφ mom...
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...
Deep Inelastic Scattering (DIS) experiments, such as eN → eX or νN → μ−X form an important basis for our knowledge of the structure of hadrons. In these processes the current probe (either a neutral current, γ/Z, or charged current, W+/W−) with large space-like momentum −q2 ≡ Q breaks-up the nucleon. The (inclusive) cross section is then determined by the structure functions F1, F2 when summing...
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of charged pions and kaons in deep-inelastic scattering of positrons on a transversely polarised hydrogen target were observed. SSA amplitudes for both the Collins and the Sivers mechanism are presented.
Evidence for a positive longitudinal double-spin asymmetry 〈Aρ1 〉 = 0.24 ± 0.11stat ± 0.02syst in the cross section for exclusive diffractive ρ0(770) vector–meson production in polarised lepton–proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA positron beam was scattered off a longitudinally polarised pure hydrogen gas target. The average invar...
We present a systematic analysis of the polarised and unpolarised processes e e ! e + e X in the deep inelastic limit and study the e ects of target photon mass (virtuality) on the photon structure functions. The e ect of target photon virtuality manifests as new singly polarised structure functions and also alters the physical interpretation of the unpolarised structure functions. The physical...
چکیده ندارد.
COMPASS, a new fixed target experiment at CERN, aimed at the study of nucleon spin structure and hadron spectroscopy, has started to collect physics data in Autumn 2001. This paper describes the COMPASS apparatus and the measurement of the gluon polarisation ∆G/G. The apparatus consists in a solid state polarised target and a two stage spectrometer with high resolution tracking, particle identi...
We present a systematic analysis of the polarised and unpolarised processes e+ e → e + e − X in the deep inelastic limit and study the effects of target photon mass (virtuality) on the photon structure functions. The effect of target photon virtuality manifests as new singly polarised structure functions and also alters the physical interpretation of the unpolarised structure functions. The phy...
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