Abstract
Measurements of short-range correlations in exclusive 4He(e,e′pN) reactions are analyzed using the Generalized Contact Formalism (GCF). We consider both instant-form and light-cone formulations with both the AV18 and local N2LO(1.0) nucleon-nucleon (NN) potentials. We find that kinematic distributions, such as the reconstructed pair opening angle, recoil neutron momentum distribution, and pair center of mass motion, as well as the measured missing energy, missing mass distributions, are all well reproduced by GCF calculations. The missing momentum dependence of the measured 4He(e,e′pN)/4He(e,e′p) cross-section ratios, sensitive to nature of the NN interaction at short-distacnes, are also well reproduced by GCF calculations using either interaction and formulation. This gives credence to the GCF scale-separated factorized description of the short-distance many-body nuclear wave-function.
Highlights
At higher momentum, and thereby shorter distance, the N N interaction is expected to transition from a predominantly tensor interaction to a scalar repulsive core
The data are in excellent agreement with calculations from the generalized contact formalism (GCF) [12,13,14,15], using both the AV18 [27] and N2LO(1.0) [28] potentials
We find that the measured missing energy and missing mass distributions, as well as the missing momentum dependence of the 4He(e, e pN ) / 4He(e, e p) cross-section ratios, are all well reproduced by GCF calculations in both formulations using either N N potential
Summary
The experimental data studied here were taken using a 4.454 GeV electron beam incident on a 4He gas target in Hall A at Jefferson Laboratory. We assume that for high initial nucleon momentum the nucleus can be modeled as an off-shell SRC pair with total (c.m.) momentum pcm, and an on-shell residual A − 2 system. The electron scatters from the nucleus by exchanging a single virtual photon with 4-momentum (q, ω) that is absorbed by a single off-shell nucleon in the SRC pair with initial 4-momentum (p1, E1). The hard breakup of SRC pairs should provide a valid description of the measured reactions, up to the inclusion of hard rescattering and single charge exchange (SCX). These effects are discussed in a later section
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