Exclusive vector meson production at HERMES
نویسندگان
چکیده
منابع مشابه
Exclusive meson production at HERMES
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...
متن کاملVector Meson Production at Hermes
Diiractive production of , , ! and J== mesons is observed at the Hermes experiment at DESY. Hermes scatters the 27.5 GeV longitudinally polarised positrons of the HERA storage ring oo an internal gas storage cell target. Polarised and unpolarised gas targets of diierent types are used. The exclusive production from diierent nuclear targets (H, D, 3 He and 14 N) shows coherent and incoherent con...
متن کاملDiffractive Vector Meson Production at Hermes
The decay distributions of 0 and mesons diiractively produced by tagged virtual photons from the 27.5 GeV HERA positron beam impinging on an internal 3 He target have been measured with the Hermes spectrometer. Both the scattered positron and the two outgoing hadrons from the vector meson decay were detected in coincidence, and exclusive elastic events selected for analysis. The decay angular d...
متن کاملExclusive vector meson production at HERA from QCD with saturation
Following recent predictions that the geometric scaling properties of deep inelastic scattering data in inclusive γp collisions are expected also in exclusive diffractive processes, we investigate the diffractive production of vector mesons. Using analytic results in the framework of the BK equation at non-zero momentum transfer, we extend the QCD-inspired saturation model to parametrise the mo...
متن کاملExclusive Meson Production at NLO
Generalized parton distributions (GPDs) are a versatile tool to quantify important aspects of hadron structure in QCD. They contain unique information on the spatial distribution of partons [1] and on the orbital angular momentum they carry in the proton [2]. The theoretically cleanest process where GPDs can be studied is deeply virtual Compton scattering (similar to inclusive DIS, which plays ...
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ژورنال
عنوان ژورنال: EPJ Web of Conferences
سال: 2014
ISSN: 2100-014X
DOI: 10.1051/epjconf/20147302017