Subject: Re: sim mtg tomorrow - anything on muons?

	OK, here is what I know about this new Z -> mu mu simulation sample.  
The executive summary is that I can't detect any changes in behavior between
this sample and the one from two weeks ago that was made with 4.8.3.

	I went through my usual acceptance calculation for a CMUP plus a 
minimum ionizing track, and found the results unchanged.  Here are the 
blow-by-blow relative acceptances as I apply cuts:

Cut		4.8.3		4.8.4pre2
One CMUP	0.331		0.335
w/pT > 20 GeV	0.913		0.914
2nd track > 20	0.570		0.571
Opp sign	0.996		0.990
66 < M < 116	0.991		0.989

Bottom line	0.1705 +- 0.0073	0.1710 +- 0.0040

Note that this still makes us differ from what we had in 4.5.3, but we already 
agree that we're not comparing the same apples there.

	Then, you can ask where the different second legs materialize in the 
detector.  Here too, we see the same results as before:

Muon type	4.8.3		4.8.4pre2
Stubless	0.208		0.200
CMU		0.069		0.075
CMP		0.120		0.115
CMUP		0.145		0.178
CMX		0.257		0.261
CMUX		0.004		0.001
BMU		0.176		0.151
BMUX		0.020		0.017

I haven't written in the errors, but I'm not too worried...the change in CMUP 
is a 1.6 sigma effect, the change in BMU is 1.3 sigma.  Note that the keystone 
and miniskirt are still on in this simulation; we ultimately want them to be 
turned off by the average user.

	So if this is OK, and if the MuonValidation plots are OK, then I think 
we're OK.  However, I think there were more changes in the sim that went in 
just this week, or maybe it was the end of last week -- who can tell anymore?  
We'll want to do all of this over for that.  Best wishes.

						Ken

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Ken Bloom, Karma Adjuster                                Department of Physics
734-763-2329 / 734-936-1817 (fax)                       University of Michigan
kenbloom@umich.edu                              http://www.umich.edu/~kenbloom