Re: [Brahms-dev-l] spectrum challenge

Hi all

I want to give you an update on the spectrum generation. I had identified two issues.
a) The sequences were all identical due to a random number issue. In particular the
cernlib routine uses the rndm() function. To use the same random number as used for other parts of the
spectrum generation, a copy of hrndm1(myhnrndm1)  was added to brag to use the ranluz generator.
This solves the problem nicely.
b) When I ran the simulated files for geant option 0 (only energy loss) I notice the input could not be reproduced.
The program that figures out the phi-range was in error. This is now fixed. This requires you use new
scaledown factors (given in the table below)

In addition to the files with geant option 5, a smaller set of files with option 0 has been generated for run  (14071).
This should reproduce the input w/o any corrections applied.
c) geant corrections should be picked up for 4 deg run-5 (e.g. if you pick it up from the run number in the list
it should work just correctly. Recall the geantCorrection object uses a runperiod nit a specfic run. There is no difference between 
cucu and pp in run5 when it comes to corrections.



 430A 14199 29.46  (46.79)
      861A 14118 36.13  (57.23)
      1219A 14200  43.39   68.50)
      1723A 14071 56.04    (88.53)
      2442A 15145 81.31   (128.2)
      3450A 14889 135.83  (213.6)


--------------------------------------------
Flemming Videbaek
Physics Department
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl.gov
----- Original Message ----- 
From: "Bekele, Selemon" <bekeleku@ku.edu>
To: "Flemming Videbaek" <videbaek@bnl.gov>
Sent: Friday, April 14, 2006 6:36 PM
Subject: RE: [Brahms-dev-l] spectrum challenge



Hi Flemming,

   which run is to be used for the geant corrections
to apply to the pp simulated data?

thanks,

Selemon,

-----Original Message-----
From: brahms-dev-l-bounces@lists.bnl.gov on behalf of Flemming Videbaek
Sent: Thu 4/13/2006 7:16 PM
To: devlist
Subject: [Brahms-dev-l] spectrum challenge

Hi
I have discovered that thorugh some mystirous interaction with Geant, that the random numbers did not change between
different sequences, even though the ranlux seed was supposely changed between runs. This may be beacuse the y and pt distributions
were generated using hbook routines.
In any case each of the sequences appers to be identical.
I will look into this and hopefully soon have a sample truly statistically different between sequences.
stay tuned

Flemming

--------------------------------------------
Flemming Videbaek
Physics Department
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl.gov


_______________________________________________
Brahms-dev-l mailing list
Brahms-dev-l@lists.bnl.gov
http://lists.bnl.gov/mailman/listinfo/brahms-dev-l