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Publications récentes

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Inclusive Λ production in proton-proton collisions at 3.5 GeV

J. Adamczewski-Musch et al. (HADES Collaboration)

The inclusive production of Λ hyperons in proton-proton collisions at √s=3.18GeV was measured with HADES at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt. The experimental data are compared to a data-based model for individual exclusive Λ production channels in the same reaction. The contributions of intermediate resonances such as Σ(1385), Δ++, or N∗ are considered in detail. In particular, the result of a partial-wave analysis accounts for the abundant pK+Λ final state. (...)

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Combining symmetry breaking and restoration with configuration interaction : A highly accurate many-body scheme applied to the pairing Hamiltonian

J. Ripoche, D. Lacroix, D. Gambacurta, J.-P. Ebran, and T. Duguet

Background : Ab initio many-body methods have been developed over the past ten years to address mid-mass nuclei. In their best current level of implementation, their accuracy is of the order of a few percent error on the ground-state correlation energy. Recently implemented variants of these methods are operating a breakthrough in the description of medium-mass open-shell nuclei at a polynomial computational cost while (...)

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Tomographic image of the proton

R. Dupré, M. Guidal, and M. Vanderhaeghen

We have carried out a phenomenological analysis of the latest deep virtual Compton scattering experimental data based on the generalized parton distribution formalism. This allows us to extract the dependence of the spatial size of the proton on the quark’s longitudinal momentum. This results in the first continuous two-dimensional momentum-space image and tomography of the proton based on experimental (...)

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Chiral potential renormalized in harmonic-oscillator space

C.-J. Yang

We renormalize the chiral effective field theory potential in harmonic-oscillator (HO) model space. The low energy constants (LECs) are utilized to absorb not just the ultraviolet part of the physics due to the cutoff, but also the infrared part due to the truncation of model space. We use the inverse J-matrix method to reproduce the nucleon-nucleon scattering phase shifts in the given model space. We demonstrate that by including the NLO correction, the nucleon-nucleon scattering in (...)

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Rosenbluth Separation of the Pi 0 Electroproduction Cross Section

M. Defurne et al. (Jefferson Lab Hall A Collaboration)

We present deeply virtual π0 electroproduction cross-section measurements at xB=0.36 and three different Q2 values ranging from 1.5 to 2  GeV2, obtained from Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component and, thus, is far from the asymptotic limit predicted by perturbative quantum chromodynamics. Nonetheless, an indication (...)

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