Conveners
Spin-3D Parallel
- Carlos Munoz Camacho
Spin-3D Parallel
- Daniel Boer (University of Groningen)
Spin-3D Parallel
- Michel Garçon
Description
Spin-3D Parallel session
Kirill Semenov-Tian-Shansky
(CPHT Ecole Polytechnique)
08/09/2015, 16:10
Spin and 3-d structure
Oral Presentation
The dual parametrization of generalized parton distributions (GPDs) and
the Mellin-Barnes integral approach represent two frameworks for
handling the double partial wave expansion of GPDs in the conformal
partial waves and in the cross-channel SO(3) partial waves. We explicitly
show the complete equivalence of these two independently developed
GPD representations. This provides additional...
Meriem Benali
(LPC Clermont Ferrand)
08/09/2015, 16:30
Spin and 3-d structure
Oral Presentation
We studied the internal structure of the nucleon with two complementary approaches:
1) At high-energy, the recently developed formalism of generalized parton distributions unifies the form factors and the parton distributions and provides access to new information. The simplest process sensitive to GPDs is the exclusive process "Deeply Virtual Compton Scattering (DVCS)". This work describes...
Dr
Lech Szymanowski
(National Centre for Nuclear Reserarch)
08/09/2015, 16:50
Spin and 3-d structure
Oral Presentation
We study the scattering amplitude for exclusive neutrino production of a charmed meson on an unpolarized target. The analysis is performed within the colinear QCD approach, where generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. We demonstrate that the transversity chiral odd GPDs contribute to the transverse cross section if the hard...
harut avakian
08/09/2015, 17:10
Spin and 3-d structure
Oral Presentation
The study of target fragmentation in Semi-Inclusive DIS is widely accepted as one of the main unique features of the Electron Ion Collider (EIC). Due to the lack of the analysis framework the current physics program of the EIC doesn’t cover observables involving hadrons produced in the target fragmentation region, which can shed light on the non-perturbative structure of the nucleon.
In...
Mr
Andria Agadjanov
(University of Bonn)
08/09/2015, 17:30
Spin and 3-d structure
Oral Presentation
In lattice quantum chromodynamics the electroweak processes that contain resonances in the initial/final states are particularly interesting. Indeed the difficulty is here due to the fact that the resonances do not correspond to the isolated energy levels in the lattice simulations. The main goal is to establish analytically, using effective field theory methods, a connection between a finite...
Malte Christian Wilfert
(Johannes-Gutenberg-Universitaet Mainz (DE))
09/09/2015, 16:10
Spin and 3-d structure
Oral Presentation
The COMPASS experiment at the CERN SPS has taken data for deep inelastic scattering of polarised muons on a polarised NH$_3$ target in 2007 and 2011 and on a polarised LiD target in 2002-2004 and 2006.
We will present our new results on the longitudinal double spin asymmetry $A_1^p$ and the spin-dependent structure function $g_1^p$ obtained from the 2011 data set. These results are used in a...
Prof.
Gary Goldstein
(Tufts University)
09/09/2015, 16:30
Spin and 3-d structure
Oral Presentation
Spin and transverse momentum dependent parton distributions - Generalized Parton Distributions, Transverse Momentum Distributions and related distributions - are at the interface between the QCD structure of the hadrons and observable quantities. The distributions are contained as linear superpositions within helicity amplitudes that factorize into universal forms at leading or next to leading...
Jakub Wagner
(Institute for Nuclear Studies)
09/09/2015, 16:50
Spin and 3-d structure
Oral Presentation
Exclusive processes of heavy mesons production and spacelike and timelike deeply virtual Compton scattering allow us to investigate the hadron structure in terms of Generalized Parton Distributions (GPDs). We will review recent developments in the NLO description of such processes.
Ignazio Scimemi
(Universidad Complutense (ES))
09/09/2015, 17:10
Spin and 3-d structure
Oral Presentation
I shall present the calculation of the unpolarized TMD fragmentation function at two loops.
This result allows to evaluate the DIS results of future machines at the same perturbative precision as the Drell-Yan processes, namely NNLO. The calculation is also an explicit check of the factorization theorem for semi-inclusive DIS at two loops and of the universality of the evolution of the TMDs.
Dr
Alfredo Vega
(Universidad de Valparaiso)
09/09/2015, 17:30
Spin and 3-d structure
Oral Presentation
Based on the matching of soft wall AdS / QCD models and Light - Front QCD for electromagnetic form factors, we derive a phenomenological wave function for hadrons with arbitrary twist dimension. Together with the Light Front Wave Function, we also obtain expressions for PDFs and GPDs.
Marie BOER
11/09/2015, 09:00
Spin and 3-d structure
Oral Presentation
Hard exclusive processes such as photoproduction or electroproduction of photon or meson off the nucleon provide access to the Generalized Parton Distributions (GPDs), in the regime where the scattering amplitude is factorized into a hard and a soft part. GPDs contain the correlation between the longitudinal momentum fraction and the transverse spatial densities of quarks and gluons in the...
Renaud Boussarie
(LPT Orsay)
11/09/2015, 09:20
Spin and 3-d structure
Oral Presentation
Transversity GPDs have yet to be experimentally unraveled. We propose to probe them by studying the electro- or photo- production of a rho meson and a photon. At dominant twist, separating the longitudinal and transverse polarization of the meson allows one to get access to respectively usual (chiral even) and transversity (chiral odd) GPDs.
maxime defurne
11/09/2015, 09:40
Spin and 3-d structure
Oral Presentation
We will show new results on exclusive pi0 and photon electroproduction in Jefferson Lab Hall A.
Maxime Levillain
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
11/09/2015, 10:00
Spin and 3-d structure
Oral Presentation
In order to understand why quark spins only contribute about a third to the nucleon spin, quite a few recent experiments have focussed on the measurement of the gluon polarization in the nucleon. To access the gluon polarization reactions where the gluons from polarized nucleon significantly contributes are necessary. For example, choosing such a kinematic where the Photon Gluon Fusion (PGF)...
Dr
Yu-Ming Wang
(TU Munich)
11/09/2015, 10:20
Spin and 3-d structure
Oral Presentation
We propose a new definition of a transverse-momentum-dependent (TMD) wave function
with simpler soft subtraction for $k_T$ factorization of hard exclusive
processes. The un-subtracted wave function involves two pieces of non-light-like
Wilson links oriented in different directions, so that
the rapidity singularity appearing in usual $k_T$ factorization is regularized,
and the pinched...
