Nuclear and Nucleon Structure Through Dileptons Production
October 24-28, 2016
ECT Trento, Italy
Strada delle Tabarelle, 286
I-38123 Villazzano TRENTO (TN)
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Meeting title: ECT Trento Workshop
Announcement
Similarly to electroproduction with respect to the photoproduction,
looking at a virtual photon in the final state gives an additional
degree of freedom to study the nucleon structure. The virtual photon
can be detected by detecting its decay in a lepton pair. Such
processes were already studied in the Hall B CLAS 6 GeV data but due
to the limited beam energy it was difficult to have enough virtuality
on both incoming and outgoing photon to ensure a description of the
process only in term of quarks.
With the 12 GeV beam availability the situation is much improved
opening the door to an extensive study of this processes. Another main
drawback of such processes is the suppression of the cross-section
roughly by a factor 100 ( alpha electromagnetic constant ) compared to
real photon cross-sections. New detector technologies can allow a
factor 10 to 100 luminosity increase compared to what was done before
making the study of these processes feasible in a reasonable
timeframe.
Thus the goal of this workshop is to determine what the impact of the
production of dilepton can have on our knowledge of the nucleon
structure in particularly in terms of Generalized Parton
Distributions.
Each day of the workshop will have a topic with discussion time at the
end of day.
After an introduction about the current status of Generalized Parton
Distribution program and the different models currently available to
describe them, the Double Doubly Virtual Scattering, Timelike Compton
Scattering and meson productions processes will be presented both on
the theoretical side to emphasize their contribution in the GPDs
determination and on the experimental side to show which measurements
could be carried. Finally the current GPDs fitting techniques will be
presented to see how much the production of dileptons can help in the
GPDs extraction and what work is needed to be able to include the
dileptons processes in those fitting techniques.
We hope that this workshop will be a starting point, giving first
directions on what measurements and what accuracies will be needed for
the measurement of dileptons processes in order to optimize the
process of GPDs extraction.
Main Topics:
Dileptons production processes
GPDs modeling,extraction and fitting
D-term and dispersion relations
Time-like Compton Scattering on Nucleon
Double Deeply Virtual Compton Scattering
Vector Meson Production
Drell Yann process
Keynote Participants:
Igor Anikin (JINR,Dubna, Russia)
Nathan Baltzell (Jefferson Laboratory, USA)
Marie Boer (Los Alamos National Laboratory, USA)
Stanley Brodsky (SLAC National Accelerator Laboratory, USA)
Vladimir Braun (University of Regensburg, Germany)
Michel Guidal (IPN Orsay, France)
Vadim Guzey (Petersburg Nuclear Physics Institute (PNPI), Russia)
Kondo Gnanvo (University of Virginia, USA)
Charles Hyde (Old Dominion University, USA)
Yordanka Ilieva (University of South Carolina, USA)
Peter Kroll (University of Wuppertal, Germany)
Kresimir Kumericki (University of Zagreb, Croatia)
Simonetta Liuti (University of Virginia, USA)
Zein-Eddine Meziani (Temple University, USA)
Pawel Nadel-Turonski (Jefferson Lab, USA) (TBC)
Maxim Polyakov (University of Bochum, Germany)
Kirill Semenov (Petersburg Nuclear Physics Institute (PNPI), Russia)
Stepan Stepanyan (Jefferson Lab, USA)
Vardan Tadevosyan (A.I.Alikhanian National Science Laboratory former
YerPhi, Armenia)
Oleg Teryaev (JINR, Dubna, Russia)
Jakub Wagner (National Center for Nuclear Research, Poland)
Samuel Wallon (LPT Orsay, France) (TBC)
Christian Weiss (Jefferson Lab, USA)
Zhiwen Zhao (Duke University, USA)
Organizers:
Alexandre Camsonne (Jefferson Lab)
Eric Voutier (IPN Orsay, France)
Lech Symanowski (National Centre for Nuclear Research, Warsaw)