[Hallc_sidis_analysis] HMS gas cherenkov counter

[bosted at jlab.org]

Hi all,
   In case you didn't see this, here is a nice review of Cherenkov counters:
https://www.jlab.org/indico/event/296/session/11/contribution/11/material/slides/0.pdf
   So the HMS should have 0.5 atm of C4Fsomething. I didn't see the pion
threshold mentioned. Brad, can you give us the number?
I imagine that it is aobut 5.2 GeV.
   Of particular note: one HMS mirror was broken until it was fixed in
summer 2018. I use a cut dp/p > -5% for runs in Spring18 to keep an
efficiency >98%.
   Peter
p.s. Sorry I left the meeting early: my computer crashed.  If anyone is
interested in using my "fiducial acceptance" regions for each
spectrometer, let me know. But maybe just as a starting point: you may
want to make your own. I know I should make a writeup, but I am swamped
with music gigs at the moment and won't be doing much physics until after
Jan. 5.

> Hi All,
> We will have the regular SIDIS analysis meeting tomorrow (Wednesday) at
> Noon EDT.
> For those at JLab Room F227 has been reserved.
>
> The Meeting URL is
> https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_648672553_&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=6UVi9h7XDe4YpNVl1Pr7kJfw2N_A9rNcjJ8jEvLZw2M&m=f7d6ByT3-txcF1NO4fsLtaywcI8WqZO7nQA_6IggV4c&s=oeiE0cXfAVyCM_Y8U2x5IzW7OENJLCIAj3KVoVfRZ5k&e=
>
>
> Please plan on showing a few slides on your work and please upload the
> slides to the SIDIS elog at:
> https://hallcweb.jlab.org/elogs/SIDIS+Pt+and+CSV+Experiments+Analysis/
> <https://hallcweb.jlab.org/wiki/index.php/SIDIS#Weekly_Meetings>
>
> Cheers
> Dipangkar
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