Centrality (was: ZDC cut efficency vs multiplicity)

From: Christian Holm Christensen (cholm@hehi03.nbi.dk)
Date: Tue Jan 09 2001 - 08:32:10 EST

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    Hi Bjorn et al, 
    
    I'd like to direct your attention to the mail I sent yesterday, in
    reply to Bjorns mail. 
    
    In that mail, I provide a strong argument why you _must_ consider your
    centrality cut as dependent on the vertex location. This is not
    something that can be ignored. If you do not include this dependency
    in your analysis, your the errors results will be
    undetermined. Therefore I strongly urge you to read that mail again. 
    
    As a supplement to the privious mail, here's a diagram of the trigger
    word generation:
    
       +---+      +------------+    +---+ 
       | E |--+---| Scaler box |----| L |
       | x |  |   +------------+    | o |  
       | p |  |   +------------+    | g |
       | e |--|+--| Scaler box |----| i |
       | r |  ||  +------------+    | c |-------------------+          
       | i |  ||                    | a |                   |
       | m |  ||   ...              | l |   +----------+----------+       
       | e |  ||                    |   |   | Second   | First    | 
       | n |  ||  +------------+    | O |   | 8 bit of | 8 bit of | 
       | t |--||+-| Scaler box |----| R |   | trigger  | trigger  |  
       +---+  ||| +------------+    +---+   | word 1   | word 1   |
    	  |||                           +----------+----------+
    	  |||   +---------+                  |
    	  ||+---| Logical |                  |
              |+----|         |------------------+
              +-----| OR      |
                    +---------+
    
    As far as I gather, no event will be written if the second 8 bits of
    trigger word 1 is identical 0, though Konstantin would probably be
    able to tell you all the gory details.  
    
    Yours, 
    
    Christian  -----------------------------------------------------------
    Holm Christensen                             Phone:  (+45) 35 35 96 91 
      Sankt Hansgade 23, 1. th.                  Office: (+45) 353  25 305 
      DK-2200 Copenhagen N                       Web:    www.nbi.dk/~cholm    
      Denmark                                    Email:       cholm@nbi.dk
    



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