[A1n_d2n] Version1 update for new C3q proposal

[Xiaochao Zheng]

Dear e+ and SoLID supporters:

Many thanks to those who signed up for the new C3q proposal and those who provided helpful discussions and checks.  I have posted an updated version (now #1) at
https://drive.google.com/file/d/1DIPddmyMwKzlCE0tgSYWuchSBdOc38jc/view?usp=sharing

changes compare to v0 include:  updates to pair production background calculations; moving projected physics results to a separate section (looks much better now); relating to other e+ experiments on TPE study; and adding projected results on F3gammaZ. I hope to provide weekly updates from now on.  (Next detail to add will be DAQ deadtime and GEM tracking efficiency.)

Please be critical and send me comments and suggestions.  If PVDIS was K2, then this one is like going to the Moon. We need a well developed plan (and a e+ beam) to get there.

Please also feel free to forward this to anyone who may be interested in the physics.

Best regards,

Xiaochao
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