Download Protection Circuit for LVPS - Indico

Search For the Higgs
o
H ->ZZ*->bbll
Philip Davis (NMSU)
Mentor: Dr. Teuscher (U of T)
Aided by Christophe Le Maner (U of T)
Invariant Mass of Higgs
for mH of 150 GeV before Cuts
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Electron (shown) and Muon System
Luminosity 30 fb-1
Mass Analysis on mH of 150 GeV
Higgs Signal
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Back Grounds
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tt
ZZ
Zbb
bb
Zee
Zmm
Intro
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Previous analysis of this decay channel
done by Christophe Le Maner
 Monte
Carlo Data created using Pythia,
MCatNLO, and AcerMC
 New Monte Carlo Data simulated after first
analysis
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What I did
 Try
to recreate old analysis
 Apply my own analysis
 Create automated system of applying cuts
Cuts for mH of 150 GeV on Electron Channel
(Previous Analysis)
Cut
Value
Zero total charge on lepton pair
Charge e1 + e2 = 0
Inv. Mass of Virtual Z System
10 < mZ < 65 GeV
Inv. Mass of Z System
50 < mZ < 110 GeV
η1 and η2 of VBF jets opposite dir.
η1*η2 < 0
Diff. in pseudo rapidity of VBF jets
|∆η| > 3.3
Mass of VBF jets
mjj > 300 GeV
Missing Pt
Ptmiss < 25 GeV
b jet and lepton in between VBF jets
Mass window
130 < mH < 170 GeV
Previous Analysis
Higgs Mass
S
S/√BG
H130 (ee channel)
0.14
0.057
H150 (ee chanel)
0.79
0.227
H130 (μμ chanel)
0.13
0.052
H150 (μμ chanel)
0.75
0.18
- Christophe Le Maner
Repeating Previous Analysis
Higgs Mass
S
S/√BG
Relative Error
H130 (ee channel)
0.246
0.025
25.88%
H150 (ee chanel)
0.901
0.0812
20.63%
H130 (μμ chanel)
0.209
0.027
33.59%
H150 (μμ chanel)
0.877
0.0938
25.10%
(New Data)
Cuts for mH of 150 GeV on Electron Channel
Cut
Value
2 b-jets required
Invariant mass of
di-electron System
Missing Pt
Diff. in pseudo rapidity of VBF jets
Sum of Pt of VBF Jets
Mass of VBF jets
10 < mee < 65 GeV
Pt < 25 GeV
|∆η| > 3.3
Pt 1 + Pt 2 > 90 GeV
mjj > 300 GeV
η1 and η2 opposite dir.
η1*η2 < 0
Inv. Mass of Z System
50 < mZ < 110 GeV
Zero total charge on lepton pair
Charge e1 + e2 = 0
Mass window
130 < mH < 170 GeV
Histograms
Gev
• 50 < mzo < 110 GeV
•10 < mee < 65 GeV
•(constrain leptons to come from Virtual Z)
More Histograms
GeV
Missing Pt < 25 GeV
GeV
Mass of VBF jets > 300 GeV
Pt of Forward Jet 1 Vs. Jet 2
Sum > 90 GeV
Pt of 2 jet (GeV)

Pt of 1 jet (GeV)
New Cuts
Higgs Mass
S
S/√BG
Relative Error
H130 (ee channel)
0.232
0.0339
39.57%
H150 (ee chanel)
0.882
0.103
28.23%
H130 (μμ chanel)
0.207
0.032
41.64%
H150 (μμ chanel)
0.878
0.116
31.13%
•Problem with H130 data is that it start out with low number of events
•Increase in S/√BG from old cuts
•Increase in Relative Error from old cuts
•H150 data gives better results but still low significance
•Signal Rejection ~ 21% (H150 ee chanel)
•Background Rejection ~ 0.028% (H150 ee chanel)
Signal after Cuts
Higgs Signal
Fully Automated Cut System
Program run cuts over a range of values
and stores results to root file.
 Results searched my another program to
return cuts with best outputs.
 Only used old data on this program.
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 Relative
Error usually about 100%
 Next step should be to uses this method on
new data
Protection Circuit for LVPS
Background
Front end electronics of the Tile Calorimeter
in ATLAS are kept in drawers as seen
above.
 TileCal has 256 of these drawers
 Each drawer requires its own power supply.
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Background/Problem
The Low Voltage Power Supply (LVPS)
converts a 200 V DC power supply to 8
DC voltages required by the front end
electronics in the TileCal.
 When installed in the pit the LVPS has
burned up components due to voltages
going over their ratings.
 Important issue for LHCC
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Solution
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Regulating Circuit that monitors the 8 voltages and
currents going to the detector.
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Monitors for under-voltage, over-voltage, and over-current.
Circuit switches power off in TileCal when voltage or
current goes out of range.
Voltages put into two groups. High Voltage side and
Digitizer side.
High Voltage
When one side is triggered the other side can still
operate.
Circuit Simulation
Circuit simulated in Quartus II
 Implemented in Embedded Local Monitor
Board (ELMB) in the LVPS
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Circuit Explanation
Current input
Voltage input
Trip
Outputs
32 bit Shift
Register
Redundancy
circuit
Wave form of Inputs and Outputs
Outputs of Digitizer and High Voltage Trigger
Output of Shift Register
Special Thanks
Dr. Teuscher
 Christophe Le Maner
 CERN
 University of Michigan
 NSF
 Ford
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Backup slides
Cut Table
Cuts with weights for Electron Channel
Cut
mH
tt
Zbb
ZZ
Zee
Zmm
bb
Total BG
Total number of events
4.19315
41968.3
19334.4 64.86
8802.7 8911.03 176032
number of bjets
3.92187
40309.1
18031.2 59.891
8723
0
117355
invariant mass of electrons 2.63913 16928
1034.99 7.46192
55.3264
0
9338.7
missing pt
2.05103
1380.35
815.202 5.61553
49.5229 0
0
Delta of eta for VBF jets
2.05103
1380.35
815.202 5.61553
5.41657 0
0
sum pt of vbf jets
1.35695
481.919
245.217 0.517659
0.386898 0
0
mass of vbf jets
1.32322
441.759
218.973 0.436551
0
0
0
eta1*eta2<0
1.32322
441.759
218.973 0.436551
0
0
0
zed mass
1.09917
115.89
91.0336 0.34113
0
0
0
even charge
1.0972
102.121
90.2135 0.331588
0
0
0
mass window
0.881866 33.2754
39.3659 0.0978065 0
0
0
Signal/sqrt(BG)
255113
184478
47364.4
2250.7
2206.59
728.041
661.169
661.169
207.265
192.666
72.7391
0.00830183
0.00913106
0.0121265
0.0432329
0.0436628
0.0502907
0.0514607
0.0514607
0.0763487
0.0790467
0.1034
Cuts with weights for Muon Channel
Cut
Total number of events
Total number bjets
invariant mass of muons
missing pt
Delta of eta for VBF jets
sum pt of vbf jets
mass of vbf jets
eta1*eta2<0
zed mass
even charge
mass window
mH
3.62164
3.39871
2.29167
1.97626
1.97626
1.31479
1.28302
1.28302
1.07471
1.07415
0.87793
tt
37159.4
35726.3
13948.1
1040.72
1040.72
346.523
316.69
316.69
81.4673
78.025
19.5063
Zbb
15123.9
14185.7
773.376
666.76
666.76
223.073
209.131
209.131
83.6525
83.6525
37.7256
ZZ
48.7148
45.2463
5.44377
4.52534
4.52534
0.527201
0.474719
0.474719
0.372142
0.372142
0.145517
Zee
8802.7
0
0
0
0
0
0
0
0
0
0
Zmm
8911.03
8818.64
6.70331
4.66317
0.874345
0
0
0
0
0
0
bb
176032
58677.3
29338.7
29338.7
0
0
0
0
0
0
0
Total BG
246078
117453
44072.3
31055.3
1712.88
570.124
526.296
526.296
165.492
162.05
57.3774
Signal/sqrt(BG)
0.00730077
0.00991704
0.0109161
0.0112144
0.0477508
0.0550644
0.0559266
0.0559266
0.0835418
0.0843803
0.115902
Output of HV and Digitizer Pins
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Wave of output pins
Shows that each input works and that the
corresponding output pin is triggered.