556 citations · 5.8k across the 82 of their papers we have counts for
84 papers
Free maps in critical dimension on
Roberto De Leo
The critical dimension for free maps on m-manifolds is . We show that for every . The main tool is a…
The Chain Graph of a general Iterated Function System
Roberto De Leo
Classical fractal geometry describes the metric and topological structure of attractors generated by contractive Iterated Function Systems (IFSs). Much less is known about their gl…
Free maps in critical dimension on low-dimensional tori and closed surfaces
Roberto De Leo
We present a method to build free immersions in critical dimension on -tori for by using a factorization trick inspired by tori immersions in critical dimension…
Recurrent and gradient dynamics of Iterated Function Systems
Roberto De Leo
We study the qualitative dynamics of general Iterated Function Systems (IFSs) through chain recurrence and a decomposition into recurrent and gradient-like behavior. At the same ti…
Shadow chains and Conley chains for continuous-time semiflows
Roberto De Leo, James A. Yorke
In a recent series of articles we introduced the concept of "stream of a semiflow. A stream is a closed and transitive binary relation which extends the relation "being on the orbi…
Streams and Graphs of Dynamical Systems
Roberto De Leo, James A. Yorke
While studying gradient dynamical systems (DSs), Morse introduced the idea of encoding the qualitative behavior of a DS into a graph. Smale later refined Morse's idea and extended…
Graph and backward asymptotics of the tent map
Ana Anusic, Roberto De Leo
The tent map family is arguably the simplest 1-parametric family of maps with non-trivial dynamics and it is still an active subject of research. In recent works the second author,…
Backward asymptotics in S-unimodal maps
Roberto De Leo
While the forward trajectory of a point in a discrete dynamical system is always unique, in general a point can have infinitely many backward trajectories. The union of the limit p…
A Glimpse of Gluons through Deeply Virtual Compton Scattering on the Proton
M. Defurne, A. Martì Jiménez-Argüello, Z. Ahmed +91
The proton is composed of quarks and gluons, bound by the most elusive mechanism of strong interaction called confinement. In this work, the dynamics of quarks and gluons are inves…
Rosenbluth separation of the Electroproduction Cross Section off the Neutron
M. Mazouz, Z. Ahmed, H. Albataineh +95
We report the first longitudinal/transverse separation of the deeply virtual exclusive electroproduction cross section off the neutron and coherent deuteron. The correspondin…
Ratios of helicity amplitudes for exclusive electroproduction on transversely polarized protons
The HERMES Collaboration, A. Airapetian, N. Akopov +74
Exclusive -meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized…
Rosenbluth separation of the electroproduction cross section
M. Defurne, M. Mazouz, H. Albataineh +91
We present deeply virtual electroproduction cross-section measurements at =0.36 and three different --values ranging from 1.5 to 2 GeV, obtained from experiment…
On the Numerical Solution of the Far Field Refractor Problem
Roberto De Leo, Cristian E. Gutiérrez, Henok Mawi
The far field refractor problem with a discrete target is solved with a numerical scheme that uses and simplify ideas from Caffarelli, Kochengin and Oliker. A numerical implementat…
Electroexcitation of the at low momentum transfer
A. Blomberg, D. Anez, N. Sparveris +92
We report on new p measurements at the resonance at the low momentum transfer region. The mesonic cloud dynamics is predicted to be dominant an…
Transverse-target-spin asymmetry in exclusive -meson electroproduction
The HERMES Collaboration, A. Airapetian, N. Akopov +93
Hard exclusive electroproduction of mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely…
Bose-Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon
HERMES Collaboration, A. Airapetian, N. Akopov +116
Bose-Einstein correlations of like-sign charged hadrons produced in deep-inelastic electron and positron scattering are studied in the HERMES experiment using nuclear targets of $^…
Pentaquark search at HERMES
The HERMES Collaboration, N. Akopov, Z. Akopov +103
The earlier search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel , has been extended with improv…
Spin density matrix elements in exclusive electroproduction on H and H targets at 27.5 GeV beam energy
The HERMES Collaboration, A. Airapetian, N. Akopov +97
Exclusive electroproduction of mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q>1.0 GeV, 3.0 GeV < W < 6.3 GeV, and -t'< 0.2…
Transverse polarization of hyperons from quasireal photoproduction on nuclei
The HERMES Collaboration, A. Airapetian, N. Akopov +134
The transverse polarization of hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by…
Single Spin Asymmetries in Charged Kaon Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized Target
Y. X. Zhao, Y. Wang, K. Allada +113
We report the first measurement of target single spin asymmetries of charged kaons produced in semi-inclusive deep inelastic scattering of electrons off a transversely polarized $^…
Weak solutions of the cohomological equation on R^2 for regular vector fields
Roberto De Leo
In a recent article, we studied the global solvability of the so-called cohomological equation L_X f=g in C^\infty(\Rt), where X is a regular vector field on the plane and L_X the…
Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction
I. Korover N. Muangma, O. Hen, R. Shneor +115
We studied simultaneously the 4He(e,e'p), 4He(e,e'pp), and 4He(e,e'pn) reactions at Q^2=2 [GeV/c]2 and x_B>1, for a (e,e'p) missing-momentum range of 400 to 830 MeV/c. The knocked-…
Reevaluation of the parton distribution of strange quarks in the nucleon
The HERMES Collaboration, A. Airapetian, N. Akopov +111
An earlier extraction from the HERMES experiment of the polarization-averaged parton distribution of strange quarks in the nucleon has been reevaluated using final data on the mult…
Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction
J. Katich, X. Qian, Y. X. Zhao +113
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction He on a pola…