MuCap analysis update, July 4, 2006

[Tom Banks <tbanks@socrates.berkeley.edu>]

Dear MuCappers,

since we will not be holding our customary analysis teleconference
tomorrow, I wanted to call your attention to some recent Run8-related
analysis results:

1. The Berkeley analysis of the "common runlist" Run8 files (using the PSI
merlin cluster and "big cats" computers) has finished, and the results are
posted on the webpage

  http://weak0.physics.berkeley.edu/weakint/research/muons/private/tbanks_dir/TeleConf/2006Jun27/2006Jun27_updated.html

These numbers update the preliminary results that I presented last week
(June 27), on the webpage

  http://weak0.physics.berkeley.edu/weakint/research/muons/private/tbanks_dir/TeleConf/2006Jun27/2006Jun27.html


2. I have used my Monte Carlo software to investigate the details of
performing a zero-extrapolation procedure to correct for muSC deadtime
effects.  The results are posted in my July 4 worklog,

  http://weak0.physics.berkeley.edu/weakint/research/muons/private/tbanks_dir/TeleConf/2006July4/2006July4.html

My basic conclusions are this: The second "lever-arm" point's deadtime
value cannot exceed 100ns, the start time in our lifetime fits.  Given
this fact, the error propagation formula suggests that we would need to
analyze ~ 10% of the unskimmed data set to obtain sufficient statistics
on the second deadtime point for a reasonable correction.


3. Fred has begun compiling trend plots for the Run8 data rates, using the
software from during Run10.  The resulting root files are available on his
analysis page at

  http://kaon.physics.berkeley.edu/~fegray/mucap/rates-2006-07-03/

I think we still need to carefully consider what runs to include, and
perhaps perform studies on how the results change according to the
selected runset.

Have a happy Fourth,
Tom