619 research outputs found
GPDs at non-zero skewness in ADS/QCD model
We study Generalized Parton Distribution functions (GPDs) usually measured in
hard exclusive processes and encoding information on the three dimensional
partonic structure of hadrons and their spin decomposition, for non zero
skewness within the AdS/QCD formalism. To this aim the canonical scheme to
calculate GPDs at zero skewness has been properly generalized. Furthermore, we
show that the latter quantities, in this non forward regime, are sensitive to
non trivial details of the hadronic light front wave function, such as a kind
of parton correlations usually not accessible in studies of form factors and
GPDs at zero skewness.Comment: 6 pages, 7 figure
Spinning Q-balls in Abelian Gauge Theories with positive potentials: existence and non existence
We study the existence of cylindrically symmetric electro-magneto-static
solitary waves for a system of a nonlinear Klein-Gordon equation coupled with
Maxwell's equations in presence of a positive mass and of a nonnegative
nonlinear potential. Nonexistence results are provided as well.Comment: arXiv admin note: text overlap with arXiv:0903.3322 by other author
Studying the neutron orbital structure by coherent hard exclusive processes off 3He
Hard exclusive processes, such as Deeply Virtual Compton Scattering (DVCS),
allow to access generalized parton distributions (GPDs). By means of an Impulse
Approximation (IA) calculation, it is shown here how, in the low momentum
transfer region, the sum of the GPDs H and E is dominated by the neutron
contribution. Thanks to this property, 3He could open a new way to access the
neutron structure information. In this work, a simple and efficient extraction
procedure of the neutron GPDs, able to take into account the nuclear effects
included in IA analysis, is proposed.Comment: 4 pages, 3 figures; talk presented by Matteo Rinaldi at 3rd Workshop
On The QCD Structure Of The Nucleon (QCD-N'12), 22-26 Oct 2012, Bilbao, Spai
Scalar and Tensor Glueballs as Gravitons
The bottom-up approach of the AdS/CFT correspondence leads to the study of
field equations in an background and from their solutions to the
determination of the hadronic mass spectrum. We extend the study to the
equations of gravitons and determine from them the glueball spectrum.
We propose an original presentation of the results which facilitates the
comparison of the various models with the spectrum obtained by lattice QCD.
This comparison allows to draw some phenomenological conclusions.Comment: 9 pages , 5 figure
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