Proton Spin Structure at Small-xx

We generalize the Bartels-Ermolaev-Ryskin approach for the $g_1$ structure function at small-$x$ to determine the small-$x$ asymptotic behavior of the orbital angular momentum distributions in QCD. We present an exact analytical solution of the evolution equation in the double logarithmic approximation and discuss its implications for the proton spin problem.Comment: 6 pages and 3-page appendix; v2:minor correction, references adde

L’urbanisme moderne de dalle, histoire d’une utopie inachevée : le cas de Mériadeck

This introducing dissertation presents a project made during the last semester of the 2nd year of Master in Urban Design. This project is all about the requalification of the district of Meriadeck in Bordeaux. The metamorphosis of this little part of the town will call on different kinds of studies, especially on the history of the construction of the district and all the utopias carried on with it. The work on scales, from the city to the block, will also be of importance. Taking stock of the situation will enable to understand the strong identity of Meriadeck and its surroundings, and thus permit to propose a new program of public spaces, of news access connecting the neighbourhood to the old city.Ce mémoire introductif présente un projet réalisé durant le semestre de fin d’année du Master II Design Urbain. Ce projet porte sur la requalification du quartier de Mériadeck de Bordeaux. La transfiguration de ce bout de ville fera appel à plusieurs types d’études, notamment sur l’histoire de la construction du quartier et les utopies qui l’accompagnent. Le travail des échelles, de la ville à l’îlot, aura également son importance. Cet état des lieux permettra d’appréhender l’identité forte de Mériadeck et de ses alentours. Afin de proposer un programme de nouveaux espaces publics et d’accès reconnectant ainsi le quartier à la vieille ville de Bordeaux

Revealing transversity GPDs through the photoproduction of a photon and a ρ\rho meson

Photoproduction of a pair of particles with large invariant mass is a natural extension of collinear QCD factorization theorems which have been much studied for deeply virtual Compton scattering and deeply virtual meson production. We discuss the production of a photon and a meson, where the wide angle Compton scattering on a meson subprocess factorizes from generalized parton distribution. We calculate at dominant twist and leading order in $\alpha_s$, the production cross-section of a transversely polarized $\rho$ meson which is sensitive to chiral-odd GPDs, and show that it may be measurable in near future JLab experiments.Comment: 6 pages, 3 figures. Contribution to the proceedings of the 6th International Conference on Physics Opportunities at an Electron-Ion Collider (POETIC6), September 7-11, 2015, Palaiseau, France. The numerical plot (fig.3) has been corrected. arXiv admin note: text overlap with arXiv:1511.0437

Towards a complete next-to-logarithmic description of forward exclusive diffractive dijet electroproduction at HERA: real corrections

We studied the $ep\rightarrow ep+2jets$ diffractive cross section with ZEUS phase space. Neglecting the $t$-channel momentum in the Born and gluon dipole impact factors, we calculated the corresponding contributions to the cross section differential in $\beta=\frac{Q^{2}}{Q^{2}+M_{2jets}^{2}}$ and the angle $\phi$ between the leptonic and hadronic planes. The gluon dipole contribution was obtained in the exclusive $k_{t}$-algorithm with the exclusive cut $y_{cut}=0.15$ in the small $y_{cut}$ approximation. In the collinear approximation we canceled singularities between real and virtual contributions to the $q\bar{q}$ dipole configuration, keeping the exact $y_{cut}$ dependency. We used the Golec-Biernat - W\"usthoff (GBW) parametrization for the dipole matrix element and linearized the double dipole contributions. The results give roughly $\frac{1}{2}$ of the observed cross section for small $\beta$ and coincides with it for large $\beta.$Comment: 40 pages, 7 figure

Impact factor for high-energy two and three jets diffractive production

We present the calculation of the impact factor for the gamma(*) -> q qb g transition within Balitsky's high energy operator expansion. We also rederive the impact factor for the gamma(*) -> q qb transition within the same framework. These results provide the necessary building blocks for further phenomenological studies of inclusive diffractive deep inelastic scattering as well as for two and three jets diffractive production which go beyond approximations discussed in the litterature.Comment: 27 pages, 2 figure

Impact Factor for Exclusive Diffractive Dijet Production with NLO Accuracy

Relying on the shockwave approach, we present the main steps of the computation of the impact factor for the exclusive diffractive photo- or electro- production of a forward dijet with NLO accuracy. We provide details of the cancellation mechanisms for all the divergences which appear in the intermediate results.Comment: 4 pages, 1 figure; proceedings of "Diffraction 2016", International Workshop on Diffraction in High-Energy Physics, Acireale (Catania, Sicily), Sept. 2-8, 2016; to be published in the conference proceedings by AI