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Vub measurement using recoil of fully reconstructed Bs

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Subject:
From:
Urs Langenegger <[log in to unmask]>
Reply To:
Date:
10 Jan 2003 08:37:37 -0800 (PST)Fri, 10 Jan 2003 08:37:37 -0800 (PST)
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Hoi,

I used the command e.g. 

  skimData -g 1620000-1799999 --tableprefix objy --s SP -m "B+B- generic"

to obtain  the numbers  in the  table below on  01/08/03.  I  used the
runnumbers as given in

  http://www.slac.stanford.edu/BFROOT/www/Computing/Offline/Production/run_ranges.html

for the division into years: 

  2000 with bug  600000-759999
  2000 w/o  bug  1200000-1344999 

  2001 with bug  770000-1009999
  2001 w/o  bug  1370000-1609999

  2002 w/o  bug  1010000-1199999 1620000-1799999

As of today, I find the following numbers of events: 
=========================================================
MC <10.3.1a         B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                 9.6                 9.3
2001                24.9                24.9
---------------------------------------------------------
Total               34.2                34.2
=========================================================
MC >=10.3.1a        B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                22.2                22.2
2001                34.6                37.3
2002                56.6                54.7
---------------------------------------------------------
Total               113.4               114.2
=========================================================

The lumis for the data is 
  2000, 1900V  10.6/fb  
  2000, 1960V   9.6/fb
  2001, 1930V  35.6/fb
  2002, 1930V  25.6/fb

This amounts to 81.4/fb (on  resonance), which I take to imply 90x10^6
BB pairs.  The lumis are  in a ratio  of 1/1/3.5/2.5 or  (in integers)
2/2/7/5. I do not understand Concezio's 

 > Luminosity ratios: 2:1:6:3

>From this  one can see that currently  we have too much  2002 MC.  The
2000 data  should always be split  1:1 into 1900  and 1960 conditions.

If we want to  
 o replace the runs with <10.3.1a 
 o have 3x data statistics in MC 

we would need an additional 42x10^6 BBbar events: 
=========================================================
new MC              B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                 8.5                 8.5     
2001                12.5                12.5      
---------------------------------------------------------
In this minimal scenario the total sample is not properly lumi-mixed
since we still have too much 2002 MC. 

This can be remedied with the following scenario (removing part of the
2002 MC): 
=========================================================
new MC              B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                11.0                11.0 
2001                24.0                21.0      
2002                -12                 -10
---------------------------------------------------------
This would give a total sample of 
=========================================================
new MC              B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                33.2                32.2 
2001                58.6                58.3
2002                44.6                44.7
---------------------------------------------------------
Total               136.4               135.2

which is quite close to  the proper lumi-weighting. This is also quite
close to the 60x10^6 events needed posted by Concezio.

If we do not want to remove 2002 MC, we would need something along the
lines of: 
=========================================================
new MC              B+ (10^6 events)    B0  (10^6 events)
=========================================================
2000                21.8                21.8
2001                43.4                40.7      
---------------------------------------------------------

This picture  will change somewhat with the  additional 30x10^6 events
to be swept tomorrow, but since I don't know how much of those will be
BB, I cannot include them in my calculation at the moment.

Since I am still a bit jet-lagged, I may have erred somewhere above.

Cheers,
--U.






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