SiW luminosity from ROCROS for LEPC

• Subject: SiW luminosity from ROCROS for LEPC
• From: Nobody <nobody@www.cern.ch>
• Date: Wed, 22 Oct 1997 12:03:37 +0200 (MET DST)

 Here is a short summary on the 
 luminosity uncertainty and scaling factors 
 which have to be applied to the output
 from Rocros to get the "best" luminosity value. 
 The reference Luminosity is always SWRL.  
 These are preliminary results for LEPC.

--------------------------------------------
Systematic error on Lumi (set to 100% in Rocros output):

 experimental  :       0.23%
 bhabha theory :       0.25%
                     -------
                       0.34%

--------------------------------------------

 beam energy uncertainty 
 (+/- 100 MeV)             :     dL/L = 0.22%
--------------------------------------------

 Scaling factors:

 o  Adjustment to default cross-section in rocros:
    scale luminosity DOWN  as

    Lumi(true) = Lumi(rocros)*0.9918 

 o  Rope nominal beam energy higher by 150 MeV:
    scale luminosity DOWN  as

    Lumi(true) = Lumi(rocros)*0.9968 

 Overall scaling factor:


    Lumi(true) = Lumi(rocros)*0.989

    For any question/problem don't hesitate to contact me 
    or Silvia 




Silvia Arcelli and Anna Macchiolo Anna.Macchiolo@cern.ch 

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