We revisit the phenomenology of deep exclusive electroproduction a lepton pair, i.e. double deeply virtual Compton scattering (DDVCS), in view new experiments planned near future. The importance DDVCS reconstruction generalized parton distributions (GPDs) their full kinematic domain is emphasized. Using Kleiss-Stirling spinor techniques, we provide leading order complex amplitudes for both and Bethe-Heithler sub-processes. Such formulation turns out to be convenient practical implementation...

Double deeply virtual Compton scattering (DDVCS) is the process where an electron scatters off a nucleon and produces lepton pair. The main advantage of this in contrast with timelike scatterings (DVCS TCS) possibility directly measuring GPDs for $x\neq\pm\xi$ at leading order $\alpha_s$ (LO). We present new calculation DDVCS amplitude based on methods developed by R. Kleiss W. J. Stirling 1980s. These techniques produce expressions amplitudes that are perfectly suited implementation...

Double deeply virtual Compton scattering (DDVCS) is a very precise tool for the nucleon tomography. Its measurement requires high luminosity electron beams and dedicated detectors, since its amplitude quite small in interesting kinematical domain where collinear QCD factorization allows extraction of quark gluon generalized parton distributions (GPDs). We analyze prospects study JLab energy as well higher electron-ion colliders. Our results are encouraging various observables both with an...

Double deeply virtual Compton scattering (DDVCS) is a very precise tool for the nucleon tomography. Its measurement requires high luminosity electron beams and dedicated detectors, since its amplitude quite small in interesting kinematical domain where collinear QCD factorization allows extraction of quark gluon generalized parton distributions (GPDs). We analyze prospects study JLab energy as well higher electron-ion colliders. Our results are encouraging various observables both with an...

Generalized parton distributions (GPDs) are off-forward matrix elements of quark and gluon operators that work as a window to the total angular momentum partons their transverse imaging (nucleon tomography). To access GPDs one needs look into exclusive processes which usually studied in kinematic regime known Bj\"orken limit. In this limit, photon virtualities much larger than hadron mass $M$, kick measured by Mandelstam's variable $t$. It turns out is not enough for purposes precise GPD...

We present a new computation in field-theoretical model of Coulomb-gauge QCD the first radial and angular excitations $qqq$ system an $SU(3)$ flavor-singlet state, ${\mathrm{\ensuremath{\Lambda}}}_{\mathrm{S}}$. The traditional motivation for study is that absence flavor singlets lowest-lying spectrum direct consequence color degree freedom. [The calculation tested with decuplet baryons $\mathrm{\ensuremath{\Delta}}(1232)$ $\mathrm{\ensuremath{\Omega}}(1672)$.] also analyze decay branching...

Abstract The Minimal Linear $$\sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>σ</mml:mi> </mml:math> Model is a useful theoretical laboratory. One can investigate in perturbative renormalisable model the properties of Higgs boson as pseudo-Goldstone boson, phenomenological effects radial mode field $$\texttt {s}$$ <mml:mi>s</mml:mi> which spontaneously breaks global SO (5) symmetry and validity conclusions based on Effective Field Theory approach with spectrum,...

We revisit the phenomenology of deep exclusive electroproduction a lepton pair, i.e. double deeply virtual Compton scattering (DDVCS), in view new experiments planned near future. The importance DDVCS reconstruction generalized parton distributions (GPDs) their full kinematic domain is emphasized. Using Kleiss-Stirling spinor techniques, we provide leading order complex amplitudes for both and Bethe-Heithler sub-processes. Such formulation turns out to be convenient practical implementation...

Double deeply virtual Compton scattering (DDVCS) is the process where an electron scatters off a nucleon and produces lepton pair. The main advantage of this in contrast with timelike scatterings (DVCS TCS) possibility directly measuring GPDs for $x\neq\pm\xi$ at leading order $\alpha_s$ (LO). We present new calculation DDVCS amplitude based on spinor techniques which produce expressions amplitudes that are perfectly suited their implementation numerical simulations. Elements impact studies,...