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Dear Colleagues,<br>
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
(<a href="http://clasweb.jlab.org/wiki/index.php/10/20/2010_Meeting">http://clasweb.jlab.org/wiki/index.php/10/20/2010_Meeting</a>) where you
can upload your updates for an off-line discussion by e-mail next days.<br>
<br>
2) we have to submit to Marco Ripani the abstract of the proposal
within tomorrow.<br>
Please take a look to this draft and send me back your comments/changes
within today. <br>
It has not to be necessary the one that we'll put on the proposal but
should state the main ideas.<br>
<br>
<br>
<b>Meson Spectroscopy with low $Q^2$ electronscattering in CLAS12<br>
<br>
</b><i>Understanding quark and gluon confinement in Quantum Chromo
Dynamics is<br>
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).<br>
We are proposing to extend the Hall-B CLAS12 capability to run
experiments<br>
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 <br>
mechanisms with respect to standard real photo-production experiments
with bremsstrahlung beams.<br>
A forward tagger made by a calorimeter, a veto counter and a tracking
device will be added to the standard equipment to detect the <br>
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 $10^7-10^8$ $\gamma/s$. <br>
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.<br>
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.</i><br>
<br>
Cheers<br>
Marco, Raffaella, Stepan and Igor<br>
<br>
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