Re: some thoughts on the Calorimeter Workshop

[beni zihlmann <bzihlman@indiana.edu>]

Hi Alex, dear GlueXers,

I probably did not express myself properly. The 150ps I quoted as TOF 
resolution
is for one plane.
So one can assume that for two planes (horizontal+vertical) the timing 
resolution
from the full device could reach 150ps/sqrt(2)=106ps. So there is 
justified hope
that for the full device we can reach 100ps or even below. The only 
caveat is that
while the efficiency will be high it will be not 100%, in particular 
because we
do not stager the paddles but they are on top of each other or side by side.

cheers,
Beni

Alex Dzierba wrote:
> Hall D PID Mail List:
>
> Dear Friends
>
> I thought the Calorimeter Workshop was very productive.
> Thanks to Matt S. for a great job organizing and chairing
> the workshop and to the JLab folks for helping with the
> local organization.  It was also nice to  see some new faces
> at the workshop - always welcome :-)
>
> I put together a short note on some thoughts following the
> Workshop:
> http://dustbunny.physics.indiana.edu/~dzierba/calor_ard.pdf
>
> In summary (more details in the note):
>
> 1 - we need to focus in particular on the BCAL test data
> especially the 10 and 20 degree data
>
> 2 - Mihajlo's preliminary photon reconstruction efficiency
> applied to the eta pio reaction
>
> 3 - There may not be much gained by moving FCAL upstream.
> And we may not want to too quickly give up on TOF.   In fact,
> using TOF to insure the purity of the pion sample for PWA
> may impose different requirements than positive K i.d. for
> "strange physics".   I know Beni is being cautious - but we
> should make an effort to achieve a robust - steady
> 100 ps TOF resolution.
>
> I plan to start working on this latter point and also to understand
> (along with Paul E) what is required of a UPV w.r.t. veto on soft
> photons from N* and Deltas.
>
> Cheers
> Alex

-- 

B. Zihlmann
Indiana University
Physics Department
727 E. Third Street
Bloomington, IN 47405
phone: (812) 855 6973
Fax:   (812) 855-5533