Trigger systematics on cusp effect
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Trigger systematics on cusp-effect. Spasimir Balev 28.04.2005. Codes to MBX. For version 15.21 of MBX (27.07.2003) and later, MFKTRIG needs L1code0 OR L1code2 . L1code0 : (Q1+Q2) * [ NUT(ntpeakloose) + Q1/10*NUT(LKRminbias) + (Q1*!Q2*1u*!AKL/D4)*(KMU3-PRE) ] L1code2 :

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Trigger systematics on cusp-effect

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Trigger systematics on cusp effect

Trigger systematics on cusp-effect

Spasimir Balev

28.04.2005


Codes to mbx

Codes to MBX

  • For version 15.21 of MBX (27.07.2003) and later, MFKTRIG needs L1code0ORL1code2.

  • L1code0:

    (Q1+Q2) * [ NUT(ntpeakloose) +

    Q1/10*NUT(LKRminbias) +

    (Q1*!Q2*1u*!AKL/D4)*(KMU3-PRE) ]

  • L1code2:

    (Q1+Q2) * [ Q2*!AKL +

    Q1/100 +

    KLrandom ]

  • In the normal data-taking periods:

    • 99.9% of triggered by MFAKE events have L1code0 set to 1

      • almost all of them pass through NUT(ntpeakloose)

      • 9.5% of them pass through Q1/10*NUT(LKRminbias)

    • 31.6% of triggered by MFAKE events have L1code2 set to 1

      • 98% of them pass through Q2*!AKL

      • 3% of them pass through Q1/100


Nt peak bad periods

NT-PEAK bad periods

  • In the bad NT-PEAK periods:

    • only 26% of the triggered by MFAKE events have L1code0 set to 1

      • 93% of them pass through Q1/10*NUT(LKRminbias)

      • 99% of them have NUT(ntpeakloose) bit set to 1, but it is switched OFF from L1 code

    • 82% of triggered by MFAKE events have L1code2 set to 1

      • 98% of them pass through Q2*!AKL

      • 3% of them pass through Q1/100

Good events / all events

SS0

SS123

15663

15753

15732

15652

15688


Nt peak bad periods summary

70%

L1 to MBX inefficiency

40%

L1 to MBX inefficiency

3%

0.7%

NT-PEAK bad periods (summary)

  • Bad period [15652 – 15663]

  • Bad period [15688 – 16732]

    NT-PEAK with huge rate, switched OFF from L1 to MBX (also switched OFF from L2)

  • Bad period [15733 – 15753]

    NT-PEAK is only with Y-projection requirement  huge inefficiency

  • Rejection level for SS123  -18%

    (only bad periods  and  removed)

  • To do:

    • NUT bad bursts?

    • They reject mostly events from the bad NT-PEAK periods, but not all of them

    • May be we can cut the oscillations of NT-PEAK before the bad periods…


Kaon mass vs day sample

Kaon mass vs. day-sample

Full SS123

Bad periods rejected

<MK> - MKPDG, keV

Day-sample


Q1 q2 inefficiency

(Q1+Q2) inefficiency

Without bad periods 1 and 2

Full SS123

117/140

123/141

Slope: -0.012 ± 0.017

Slope: 0.011 ± 0.015

114/140

123/140

M002

* Control trigger: NT-PEAK (or T0N for NT-PEAK bad periods)


Nt peak inefficiency

NT-PEAK inefficiency

152/148

Slope: -0.0005 ± 0.0425

Without bad periods 1 and 2

M002

151/147

* Control trigger: 1TRK-P (and L1code0 through Q1/10*NUT(Minbias))


1 trk p bit inefficiency

1-TRK-P bit inefficiency

Without bad periods 1 and 2

Full SS123

137/148

139/148

Slope: -0.030 ± 0.074

Slope: -0.023 ± 0.075

136/147

138/147

M002

* Control trigger: NT-PEAK (or T0N for NT-PEAK bad periods)


1 trk p trigger inefficiency

1-TRK-P trigger inefficiency

Without bad periods 1 and 2

Full SS123

153/148

178/148

Slope: 0.56 ± 0.20

Slope: 0.63 ± 0.22

151/147

177/147

M002

* Control trigger: T0N


Summary

Summary

  • We have to be careful with the good events in bad NT-PEAK periods, because they are going through different trigger chain (Q2*!AKL)

  • The rejection of these periods simplify the evaluation of systematics from the trigger, but leads to big distortions in achromat UP/DOWN ratio, which is important for “neutral asymmetry” analysis (but not for cusp-effect).

  • The c2 of the fits of inefficiency as a function of M002 are practically the same for linear and quadratic fitting function

  • c2 is good for each component of the trigger chain

  • The slopes in linear fit are compatible with 0 for each component of the trigger chain and within 3s for the trigger itself


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