Abstract
This paper gives the preliminary results of the experimental cross section for deeply virtual Compton scattering on the neutron (en → enγ ). The E08-025 experiment was performed at Jefferson Lab Hall A. We measured the (D (e ; eX – H (e ; e ′γ)X ) unpolarized cross section and we extracted, for the first time, a non-zero contribution of (neutron-DVCS + coherent-deuteron-DVCS) at Q 2 = 1.75 Ge V2 and xB = 0.36.
Highlights
The electromagnetic probe is a very important tool to investigate the properties of the nucleon
The DVCS events are selected with a cut on the missing mass squared MX2 = (k + p − k − q )2 < (M + Mπ0 )2 ≈ 1.15 GeV2
These results show for the first time the existence of a positive contribution of n-DVCS (+ d-DVCS) which is observed at both beam energies
Summary
The electromagnetic probe is a very important tool to investigate the properties of the nucleon This technique has been used to measure the nucleon form factors by elastic scattering [1] and the partons distribution functions through inclusive deep inelastic scattering [2]. In the mid-90’s, a new theoretical framework has been developed, namely the generalized parton distributions (GPDs) [3,4,5] , which relates the elastic form factors and the ordinary parton distributions These observables give information about the angular momentum of partons which is an important element to solve the "spin crisis" problem [4, 6]. The data were taken at fixed Q2 = 1.75 GeV2 and xB = 0.36 but at two beam energies Ebeam = 4.45 GeV and Ebeam = 5.54 GeV In this experiment, 15 cm liquid deuterium (D2) and hydrogen (H2) targets are used. The first step in our analysis is the calorimeter energy calibration
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