Fall Production Pass Status

1
Fall Production Pass Status

• Run 10 total statistics
• 8.6 e9 mu-minus
• From May 3rd to June 2nd
• Production pass used 3 groups from Run 10 data
• May 6th , 4.8 e8
• May 14th, 2.6 e8
• June 2nd, 5.7 e8
• Total 1.308 e 9 ( 15 of Run 10 mu minus
  statistics)
• Total mu-minus (Runs 9-11) 1.81 e10
• Total mu-plus (Runs 9-11) 0.84 e10
• More complete table located at
  http//www.npl.uiuc.edu/twiki/bin/view/Main/Analys
  isOverview

2
Lifetime information

• Check the lifetime vs. various parameters that
  have been looked at before
• Use Run 8 impact parameter value (120mm)
• Lifetime vs. Gondola
• Start time scan
• Check lifetime vs impact parameter
• Impurity information

3
Lifetime Vs. Gondola
Rate 466.8 /- 0.02 103 sec-1 Chi2 / NDF
56.7/15 3.78
Val 1.014 /- 0.023 Chi2/NDF 8.478/150.565
4
Open Questions, Solutions I

• What causes the variation in lifetime vs. phi?
• In the past, such variation has stemmed from
  non-ideal mustop definition
• With cleaner gas, use tighter diffusion
  requirements?
• Investigate track characteristics, mustop
  definition.
• Check variation in fiducial volume definition
• Fred proposes looking at mu-plus with simple def
  to narrow focus to stop definition

5
Lifetime Start Time Scan
6
Later band start times
7
Open Questions , Solutions II

• What causes the variation in the start time scan?
• Background instability?
• Improper pileup rejection definition?
• Use clean muon definition only
• Investigate kicker time distributions, coupling
  to various entrance counters

8
Lifetime Vs. Impact Parameter
Bins 1-12 represent impact Cuts of 10-120 mm Bin
13 is no impact cut
9
Notes about deviation

• ? (b120mm ) ? (bnocut) 466843 466833 10
  sec-1
• In Run 8 , this difference was 17 sec-1 , however
  12 sec-1 was accounted for by the mud correction
• Assuming that we have 0.1 ppm this year and 1.5
  ppm in run 8, we can account for at most, 1 sec-1
• Set-subset allowed deviation between b120mm and
  no cut implies an allowed variation of 2.5 sec-1
• Run 8 was left with a 5 sec-1 discrepancy in the
  error budget, right now we have 6.5 to 10 sec-1

10
Open Questions , Solutions III

• What accounts for the asymptotic behavior of non
  converging to the no-cut lifetime?
• This is worse than in run 8 and must be solved
• Why does the chisquare exhibit the opposite
  behavior from the simulations Peter K performed?
  (implied bad fits at intermediate b-cuts, good
  fits at low and high b-cuts)