[PPT] - Search for Stan Lai, Pekka K. Sinervo Exotics Meeting, April 20, PowerPoint Presentation

SLIDE 1

Search for

✁
✂

Stan Lai, Pekka K. Sinervo Exotics Meeting, April 20, 2006 Result Blessing Outline:

✄

Review of Procedure

✄

Result

✄

Plots to be blessed

1

SLIDE 2

Event Selection and Acceptance

Look for decay

✁
✂

✄ ✁ ✄ ☎ ✂ ✆✞✝ ✆✠✟ ✡ ✁ ✡ ✡ ✁ ✡

Event Selection:

☛

1 loose lepton (

☞ ✌ ✍ ✎ ✏

GeV)

☛ ✍

5 jets (

☞ ✌ ✍ ✑ ✒

GeV,

✓ ✔ ✓✖✕ ✎✗ ✏

)

☛ ✘ ☞ ✌ ✍ ✑ ✏

GeV

☛ ✙

boson, Cosmic/Conversion rejection

☛ ✚✜✛

loose SecVtx tags

Higgs Mass [GeV]

100 105 110 115 120 125 130 135

) (%) b b → H)/BR(H t A(t

0.5 1 1.5 2 2.5 3 3.5 4 CDF II Preliminary CDF II Preliminary

Source Uncertainty (%) JES 4.2 PDF 1.0 ISR/FSR 1.6 MC Model 0.5 Lep.ID 5 BTag 18 MC stats 1 Total 19 2

SLIDE 3

Acceptance Plots for Blessing

Higgs Mass [GeV]

100 105 110 115 120 125 130 135

) (%) b b → H)/BR(H t A(t

0.5 1 1.5 2 2.5 3 3.5 4 CDF II Preliminary CDF II Preliminary

tag

N

1 2 3 4 5

Fraction of events per tag bin

0.05 0.1 0.15 0.2 0.25 0.3 CDF II Preliminary CDF II Preliminary

2

= 115 GeV/c

H

m

2

= 115 GeV/c

H

m

3

SLIDE 4

Background Evaluation

We evaluate three backgrounds: Mistag Background - events with

✕ ✛ ✡

jets

☛

Use the Mistag Matrix to predict multi-mistags

☛ ✏ ✗ ✁ ✂ ✏ ✗ ✑ ✏

events Multijet Background - events without a

✆

boson in final state

☛

Using the

✘ ☞ ✌

vs Isolation method to find component in pretag sample

☛

Scale to the number of observed double tag + mistag events

☛ ✏ ✗ ✏

✂

✏ ✗ ✏

events

Irreducible Background - events with a

✆

boson and

✚ ✛ ✡

jets

☛

Find the MC fraction of these events compared to events with one fake

✡

tag

☛

Multiply this fraction by the single fake tag background that was found in mistag background

☛

Sources considered are

✄ ✁ ✄ ✡ ✁ ✡

,

✄ ✁ ✄ ✁ ✄

AND

✄ ✁ ✄

,

✄ ✁ ✄ ☎ ✆ ✆

where there is a

✆ ✂ ✄ ✝

decay

☛ ✏ ✗ ✛ ✞ ✂ ✏ ✗ ✏✟

events 4

SLIDE 5

Mistag Evaluation Plots for Blessing

[GeV]

T

E

20 40 60 80 100 120 140 160 180 200

events / 10 GeV

100 200 300 400 500

predicted tags

bserved tags
1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

η pseudorapidity

4
3
2
1

1 2 3 4

events / 0.4 units

20 40 60 80 100 120 140 160 180 200

predicted tags

bserved tags
1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

5

SLIDE 6

Event Tally and Result

Source Yield (events) Mistag

✏ ✗ ✁ ✂ ✏ ✗ ✑ ✏

Irreducible

✏ ✗ ✛ ✞ ✂ ✏ ✗ ✏ ✟

QCD

✏ ✗ ✏

✂

✏ ✗ ✏

Total Background

✏ ✗

✁

✂ ✏ ✗ ✑ ✎

Signal

✏ ✗ ✏ ✎

✂

✏ ✗ ✏ ✏ ✒

(

✁ ✂ ✄ ✑ ✑ ✒

GeV) Observed 1 Plot for blessing:

Higgs Mass [GeV]

100 105 110 115 120 125 130 135

) [fb] b b → BR(H × σ

1 10 10

2

10

3

10

4

Higgs Mass [GeV]

100 105 110 115 120 125 130 135

) [fb] b b → BR(H × σ

1 10 10

2

10

3

10

4

95% C.L. Limit ) b b → BR(H ×

H t t

σ Standard Model

1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

☛

Once backgrounds estimates finalized, the signal region was unblinded

☛

One event observed in the signal region

☛

95% C.L. Limit (

✁ ✂ ✄ ✑ ✑ ✒

GeV) on

☎ ✆✞✝ ✆ ✂ ✟ ✠ ✡ ☛ ☎ ✂ ✡ ✁ ✡ ☞

is 660 fb.

☛

For 95% C.L. limit

✌

we find

✍ ✎ ✆ ✝ ✆ ✂ ✄ ✑ ✞

.

6

SLIDE 7

Event Display for Blessing

Event with an identified, central muon, 5 jets, and three

✡

tagged jets:

X (cm)

1.5
1
0.5

0.5 1 1.5 Y (cm)

0.5

0.5 1 1.5 2

= 7.6 mm

xy

L = 3.4 mm

xy

L = 3.5 mm

xy

L Muon 26.9 GeV MET 48.1 GeV Jet 2: 41.4 GeV Jet 1: 73.8 GeV Jet 5: 15 GeV Jet 4: 23.6 GeV Jet 3: 27.9 GeV CDF II Preliminary Run 167551, Event 3626393

7

SLIDE 8

Event Display for Blessing

Event with an identified, central muon, 4 jets, and three

✡

tagged jets:

X (cm)

2.5
2
1.5
1
0.5

0.5 1 1.5 2 Y (cm)

2
1

1 2

= 16 mm

xy

L = 2 mm

xy

L = 1.1 mm

xy

L Jet 3: 50.1 GeV Jet 1: 56 GeV MET 60.9 GeV Muon 84.6 GeV Jet 2: 54.8 GeV Jet 4: 37.1 GeV CDF II Preliminary Run 178151, Event 179433

Note this event does not pass our selection criteria 8

SLIDE 9

Distribution Plots for Blessing

[GeV]

T

H

100 200 300 400 500 600 700 800 900 1000

events / 40 GeV

0.1 0.2 0.3 0.4 0.5 0.6

[GeV]

T

H

100 200 300 400 500 600 700 800 900 1000

events / 40 GeV

0.1 0.2 0.3 0.4 0.5 0.6

)

2

=115/c

H

ttH (m irreducible mistags and QCD

1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

bserved event
bserved event

Lepton Pt [GeV/c]

20 40 60 80 100 120 140 160 180 200 220 240

events / 10 GeV/c

0.1 0.2 0.3 0.4 0.5 0.6

Lepton Pt [GeV/c]

20 40 60 80 100 120 140 160 180 200 220 240

events / 10 GeV/c

0.1 0.2 0.3 0.4 0.5 0.6

)

2

= 115 GeV/c

H

ttH (m irreducible mistags and QCD

1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

bserved event
bserved event

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

bserved event
bserved event

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6 )

2

= 115 GeV/c

H

H (m t t irreducible mistags and QCD

bserved event
bserved event

bb Mass [GeV]

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

bb Mass [GeV]

50 100 150 200 250 300 350 400 450 500

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

bserved event
bserved event

9

SLIDE 10

Distribution Plots for Blessing

Missing Transverse Energy [GeV]

50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

Missing Transverse Energy [GeV]

50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

)

2

= 115 GeV/c

H

H (m t t irreducible mistags and QCD

bserved event
bserved event
1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb 50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6 50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

1

CDF II Preliminary L = 320 pb

1

CDF II Preliminary L = 320 pb

bserved event
bserved event

50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6 50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6 )

2

= 115 GeV/c

H

H (m t t irreducible mistags and QCD

bserved event
bserved event

Jet Et [GeV]

50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

Jet Et [GeV]

50 100 150 200 250 300

events / 20 GeV

0.1 0.2 0.3 0.4 0.5 0.6

bserved event
bserved event

10

SLIDE 11

Summary

Performed blind search for

✁✄✂ ✁ ☎

production

First Limits set on

✁✄✂ ✁ ☎

production

Expect background of

✆ ✝ ✞✟ ✠ ✆ ✝✡ ☛

events, observe 1 event

Another event has 3

☞

tags, but misses the jet cut
Limit set at 660 fb, 168 times above SM expectation for

✌✎✍ ✍ ✏ ✑✓✒ ✑ ✔ ✝