Transcript BELLE-BABAR template

BELLE-BABAR template
Guy Wormser
LAL Orsay
Completing the template
• Very good response to my extra requests: thanks to
everydoby!
• Now we can make direct comparisons for the three
subdetectors!
– Compute the fudge factor
– Compute the quantities at 10**34
• For BABAR HER=1,5 A LER=2,5 A
• For BELLE HER=1,1 A LER+1,6 A
• Still some work to do !
– BABAR calorimeter dose is missing
– BELLE does not always give extrapolation formula (but values at
10**34)
• I will ask somebody back in Orsay to produce a nicelooking version
SVT
• Occupancy Fudge Factor
– Same width but not same solid angle since radius is
nit the same
– Different lenght for Phi strips
– Different integrating time
• To convert BELLE numbers to BABAR units:
K=(2/3.3)**2 *(8.2/7.68)*(1/1.2)=0,33
• Occupancies at 10**34 in the first layer:
– BELLE =8%=2,3% BABAR equivalent
– BABAR= 12% West 3% East
• BABAR/BELLE = 5 for West and 1.3 for East
DCH
• Fudge factor for current: Gain*Volume
– K=5.2/5*(40000/20000)=2.08
• Fudge factor for Cell:CellxSize*Integrating time*Length
– K=0,77*5*2.76/2.2=5
• At 10**34:
– Current BELLE 20 uA BABAR ~600 uA
– Occupancies BELLE 2% BABAR 10%
Does not make sense!!!!
Error on Gas gain?
Units error?
Role of neutrons ?
My mistake?
EMC
• Fudge factor=Integrating time (oops, BABAR’s is
missing
• AT 10**34:
• Single crystals above 1 MeV:
– BELLE 620/160/150 sum 930
(Is electronic noise removed? If not , please do so)
– BABAR 400/275
sum 675
• Numbers of CLUSTERS of 20 MeV, 100 MeV
BELLE 10/3
BABAR 3,7/1
Get BABAR Integration time
Check Cluster definition
BABAR Dose information yet to be filled in(~1 krad but a large part
is Injection)
Summary
• The exercice is almost complete!
• SVT: Meaningful comparison possible
– BABAR/BELLE ratio from 4 to 1.5
• DCH : Comparison in principle possible
but strong discrepancies between the ratio
from the current and from the occupancies
• EMC one number missing and some
definition checks to allow comparison