Test Beam 2003Test Beam 2003Some Preliminary ResultsSome Preliminary Results

CMS Week Sep-2003

Trigger “quality” for normal incidence

TRAC0 resolution (position and angle) for different angles

OutlookOutlook

Trigger (BTI & TRACO) information from the output of TSS-TSM is checked using tracks obtained from chamber TDC hits

( Trigger Configuration: SET STD-DEF)

Selection of “good” eventsBy cutting on 2

No trigger for some “good” eventsHLT correspond to “good” hit timesMost of LLT correspond with delta rays

TSS-TSM: TSS-TSM: BTI Trigger qualityBTI Trigger quality vs Meantimers vs Meantimers

Taking out -rays (by cutting on

2)

NO BTI trigger events are concentrated mainly near Ibeams but still ~0.65% out of Ibeams.

Trigger on Correct BX

Tracks with hits in the 4 layers

Meantimers from SL

TSS-TSM: TSS-TSM: BTI Trigger qualityBTI Trigger quality vs track fit quality (I) vs track fit quality (I)

Fitted track “quality” redefined:

If track of N-hits has 2 > 2 the ¨worst¨ hit is removed and refitted with N-1 hits.

Selection of N´= 4 hit tracks 2 Cases studied depending on the number of hits per cell in track A) At least 1 cell with 2 hits

(Multi-hit) B) ONLY 1 hit per cell

(Single-hit)

TSS-TSM:TSS-TSM: BTI Trigger quality BTI Trigger quality vs track fit quality (II)vs track fit quality (II)

Total Trigger efficiency: 97.56 0.08

HLT: 94.86 0.12 LLT: 5.14 0.12

Total Trigger efficiency: 99.49 0.03

HLT: 98.99 0.04 LLT: 1.01 0.03

Trigger on Correct BX Trigger on Correct BX

A) Multi-hit B) Single - hit

Selection of “good” eventson SL PHI2 based on:

Hits on 4 layersGood fitted track

(cut on 2)

Selection of Events on SL PHISelection of Events on SL PHI22

High Trigger Quality “expected”

TSS-TSM: TSS-TSM: TRACO qualityTRACO quality vs Meantimers vs Meantimers

HL triggers correspond mostly with delta raysThere is a small fraction of events with “good MT” and no HH trigger

Previous events selected on SL phi2 and track with hits in 4 layers on SL phi1

HH = 89.2 %HL = 7.5 %HH = 89.2 %HL = 7.5 %

Triggers on Correct BX

Selection of “good” eventson SL PHI2 AND SLPHI1

Hits on 4 layersGood fitted track

(cut on 2)

HL 1.7%Ho,Hi 0.9%LL,Lo,Li 0.1% NO TRACO 0.3%

Statistics for “good” events on both SLsStatistics for “good” events on both SLs

HH 97%

No correlations for “no HH” with respect to MT values

No HH events No HH events

No correlations for missing TRACO events with respect to chamber position.

Dependence of Dependence of TSS-TSM:TSS-TSM: TRACOTRACO Trigger quality with Trigger quality with fit qualities (I)fit qualities (I)

Again fitted track “quality” redefined

2 Cases studied depending on the number of hits per cell in track

A) At least 1 cell with 2 hits (Multi-hit)

B) ONLY 1 hit per cell (Single-hit)

HHHLNo trigger

Dependence of Dependence of TSS-TSM:TSS-TSM: TRACOTRACO Trigger quality with Trigger quality with fit qualities (I)fit qualities (I)

Trigger on Correct BX

Trigger on Correct BX

A) Multi-hit

B) Single - hit

Quality of reconstructed Track

4 + 44 + 3

& 3 + 4

4 + x&

x + 4

Total Trig. Eff.98.03 0.18

94.71 0.65

94.38 0.67

Qual expect.

89.33 0.41

61.30 1.46

90.61 0.88

Qual expect.

10.67 0.41

38.70 1.46

9.39 0.88

A) Multi-hit

Quality of reconstructed Track

4 + 44 + 3

& 3 + 4

4 + x&

x + 4

Total Trig. Eff.99.83 0.02

99.83 0.04

99.42 0.13

Qual expect.

99.86 0.06

76.59 0.46

99.27 0.15

Qual expect.

1.14 0.06

23.41 0.46

0.73 0.15

B) Single - hit

4 + 4

4 + 4

A first look at 2-A first look at 2- Trigger Trigger

Selection of 2- events: 2 fitted tracks 4+4 on chamber && TRACO HH, HL, LL Position of the best track different from TRACO position THEN We look for a second muon on TRACO compatible with the chamber track

4 + 4 & HHQuality of the second muon

Quality of first TRACO muon

HH HH,HL,LL

Total Trig. Eff.

for 2nd muon69.90 4.52

63.50 0.50

Qual expect.

90.28 3.49

88.50 1.46

Reconstruction of tracks Reconstruction of tracks TRACO vs ChamberTRACO vs Chamber

Selection of “golden” tracks on chamber and TRACO: Chamber:

Tracks with hits in 4 layers on SL PHI1 with 2 < 0.6 &

Tracks with hits in 4 layers on SL PHI2 with 2 < 0.6

TRACO: HH triggers on correct BX

TRACO PHI coordenate correlated with chamber position Trigger Position = 1.06 x Chamber + offset

Different offsets for different regions (TRACO’s)

TRACO vs Chamber positions TRACO vs Chamber positions

TRACO: Position resolution for different anglesTRACO: Position resolution for different angles

TRACO resolution in position similar for allangles:

~0.5-0.6 mm

Different region of cellson SL PHI2

AngleAngle ReconstructionReconstruction

Traco–Chamberangle

= 1 mrad

=-4 mrad

=-1 mrad

= 3 mrad

= 7 mrad

= 3 mrad

Angle resolution

~0.3-0.4 deg (~ 5-7 mrad)

SummarySummary

Preliminary results show a good trigger performance for TRACO and BTI

There is a clear correlation between chamber performance and trigger response (as expected ! )

Data indicate trigger “intrinsic inefficiencies” (good chamber track but no trigger) lower than 1%.

TRACO track resolution (for HH) at different angles:

~ 0.5-0.6 mm ~ 5 - 7 mrad

are in good agreement with the “theoretical” expectations