[Clas12_photon] FT meeting tomorrow + proposal abstract

[Marco Battaglieri]

Dear Colleagues,
1) the FT meeting tomorrow is canceled since it overlaps Stepan's 
presentation at LNF workshop. Nevertheless, we set up a meeting agenda 
page on the wiki 
(http://clasweb.jlab.org/wiki/index.php/10/20/2010_Meeting) where you 
can upload your updates for an off-line discussion by e-mail next days.

2) we have to submit to Marco Ripani the abstract of the proposal within 
tomorrow.
Please take a look to this draft and send me back your comments/changes 
within today.
It has not to be necessary the one that we'll put on the proposal but 
should state the main ideas.


*Meson Spectroscopy with low $Q^2$ electronscattering in CLAS12

*/Understanding quark and gluon confinement in Quantum Chromo Dynamics is
one of the main issues in hadronic physics. Meson spectroscopy with 
electromagnetic probes is a powerful tool to investigate how the QCD 
partons manifest themselves in strong interaction at the energy scale of 
the nucleon mass (GeV).
We are proposing to extend  the Hall-B CLAS12 capability to run experiments
with quasi-real photons to study conventional and unconventional 
(hybrids and exotics) hadrons. The proposed technique, electroscattering 
at very low $Q^2$, providing a high photon flux and a high degree of 
linear polarization represents a  competitive and complementary  way to 
study the hadron spectrum and the production
mechanisms with respect to standard real photo-production experiments 
with bremsstrahlung beams.
A forward tagger made by a calorimeter, a veto counter  and a tracking 
device will be added to the standard equipment to detect the
scattered electrons in the angular range $ \theta_{e'}=2^\circ - 
5^\circ$ and energy range $E_{e'}=0.5-4$ GeV, with an effective 
quasi-real photon flux of $10^7-10^8$ $\gamma/s$.
The operations of the new device will be compatible with standard 
electron scattering experiments planned for Hall-B, allowing the 
proposed measurements to be run in parallel to the already approved program.
The unique combination of CLAS12 and the new forward tagger facility 
will give access to an extensive physics program, which belongs to the 
main physics focus of the Jefferson Lab upgrade./

Cheers
Marco, Raffaella, Stepan and Igor

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