Tau

Lep

ton

s at

CD

FC

DF

Ana

diC

anep

aU

nive

rsity

of P

enns

ylva

nia

Exp

erim

enta

l HE

P S

emin

ar

Uni

vers

ity o

f Pen

nsyl

vani

a

Apr

il 15

th, 2

008

OU

TLI

NE

Why

?

How

?

Sea

rche

s w

ith ta

usat

CD

F

Tau

sat

AT

LAS

Con

clus

ions

TE

VA

TR

ON

Pro

ton-

antip

roto

n co

llide

rC

ente

r of

mas

s en

ergy

√s

= 1

.96

TeV

∆t =

396

ns

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

22

Hig

gs s

ecto

rS

M-li

ke h

, H± ,

H±±

RP

V, t

1→

bτ, s

ν→

τlA

t lar

ge ta

nβ,

mS

UG

RA

χ 20→

τνχ 1

0

GM

SB

tanβ

, τ1→

τG

Tau

sin

the

SM

and

bey

ond

H →

ττ

~ 1

0% in

low

mas

s re

gion

Hig

gs m

ass

(GeV

)

ττ ττττττ

Sta

ndar

d M

odel

Sta

ndar

d M

odel

Sup

ersy

mm

etry

Sup

ersy

mm

etry

New

gau

ge b

oson

sN

ew g

auge

bos

ons

Seq

uent

ial Z

’LF

V Z

’Z

’ →τl

ud

HHta

nβ=

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

33

Sho

rt li

ved

Mea

n lif

etim

e 29

1 ps

Dec

ay le

ngth

87

µmm

= 1

.8 G

eVR

ich

phen

omen

olog

y!

The

tau

lept

on

35% τ τττ l lll

65% τ τττ h

HA

D. C

alo

rim

eter

Dri

ft c

ham

ber

Sili

con

Det

ecto

r

EM

. Cal

ori

met

er

Em

Eπ πππ0

Had

Eπ πππ± ±±±

, K± ±±±

Tra

cks

π πππ± ±±±, K

± ±±±

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

44

Tau

reco

nstr

uctio

n (I

)R

econ

stru

ctio

n of

vis

ible

pro

duct

s of

had

roni

cally

deca

ying

taus

Rec

onst

ruct

ion

of v

isib

le p

rodu

cts

of h

adro

nica

llyde

cayi

ng ta

us

ST

EP

3G

eom

etry

“Sig

nal”

and

“Iso

latio

n”T

rack

s

αsig

≡α(

ϕ,θ)

< m

in (

0.17

, 5/E

τ)0.

17 <

αis

o<

0.5

2p T

> 1

GeV

ϕ ϕϕϕ

η ηηηU

nfol

ded

CD

F c

alor

imet

er

ST

EP

2T

rack

mat

chin

gH

ighe

st p

Ttr

ack

poin

ting

to th

e cl

uste

r in

co

ne R

≡R

(η,ϕ

) =

0.4

See

d tr

ack

beco

mes

tau

dire

ctio

n

ST

EP

1C

alor

imet

er c

lust

er“C

lum

p”cl

uste

ring

See

d (s

houl

der)

tow

er E

> 6

(1)

GeV

N to

wer

s <

6

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

55

Tau

Rec

onst

ruct

ion

(II) Pr

opor

tiona

l str

ip/w

ire d

rift c

ham

ber

2 co

ordi

nate

s

Loca

ted

at 6

χ 0 in

CE

MP

ositi

on r

esol

utio

n 2-

3 m

m

Ene

rgy

reso

lutio

n ~

30%

C

lust

erin

g:se

ed s

trip

clus

ter

±5 s

trip

s th

e se

ed

calc

ulat

es χ

2

Ei(π

0 ) =

C

EM

E⋅E

CE

Si/E

CE

S

CE

M E

ass

igne

d to

π0

Rec

onst

ruct

ed τ

iden

tifie

d w

ithV

isib

le m

omen

tum

pvi

s=

ptra

cks +

pπ0

no π

0 E

(π0 )

=

CE

M E

–0.

32 G

eV

Rec

onst

ruct

ion

of n

eutr

al π

0

from

sho

wer

s in

the

CE

S d

etec

tor

Rec

onst

ruct

ion

of n

eutr

al π

0

from

sho

wer

s in

the

CE

S d

etec

tor

Ass

umpt

ions

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

66

Tau

iden

tific

atio

n at

EW

K s

cale

Tau

sar

e re

cons

truc

ted

from

Nar

row

clu

ster

in H

AD

cal

orim

eter

Tra

ck p

oint

ing

to it

Sho

wer

s in

the

CE

S d

etec

tor

elec

tron

s re

cons

truc

ted

as ta

us

~ 1

/3 je

ts r

econ

stru

cted

as

taus

Vis

. Mas

s <

1.8

GeV

1 or

3 s

igna

l tra

cks

Isol

atio

ntr

ack

isol

atio

n

π0 is

olat

ion

calo

rimet

er is

olat

ion

elec

tron

sup

pres

sion

Ene

rgy

base

d cu

tE

xplic

it ID

ele

ctro

n re

mov

al

Iden

tifi

cati

on c

rite

ria

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

77

…at

larg

e E

Ene

rget

ic ta

usco

llim

ated

dec

ay p

rodu

cts

trac

k re

solu

tion

σ(p T

)/p T

2 =0.

0015

GeV

-1

Loos

en u

p th

e re

quire

men

ts o

n ta

uca

ndid

ate

mas

s

Tau

calo

rim

eter

E (

GeV

)

Visible Mass (GeV)

m <

1.8

GeV

m <

mm

ax=

f(E

)

Cal

ibra

tion

of C

ES

det

ecto

r P

ositi

on a

nd e

nerg

y de

vice

no

w!

Vis

ible

mom

entu

m r

esol

utio

n:1-

pron

g τ

from

66%

to 8

2%

3-pr

ong

τfr

om 8

2% to

85%

CE

S Y

ield

vs.

cha

nnel

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

88

MC

mea

sure

men

tS

elec

t τor

igin

atin

g in

W→

τνD

ata

mea

sure

men

tT

aus

are

diffe

rent

from

muo

nsan

d el

ectr

ons,

no

reso

nanc

e!

Thr

ee a

ppro

ache

s

Nor

mal

izat

ion

to W

→τν

Tau

embe

ddin

g

Bac

kgro

und

from

fit t

o da

ta

Effi

cien

cy m

easu

rem

ent

real

ID

NN=

ε

nb

2

.7ε

LA

N-N

σb

kgo

bs

≡⋅

⋅=

ba

ckg

τ

ba

ckg

ID

τID

NN

NN

ε−−

=

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

99

Jets

faki

ng ta

usF

ake

rate

FR

= N

ID τ/N

jet

Mea

sure

d in

dat

a sa

mpl

es c

olle

cted

with

jet

trig

gers

If m

easu

red

in M

C s

ampl

es, m

ust t

une

the

tau

shap

e an

d ha

dron

icre

spon

se

Ele

ctro

ns fa

king

taus

Fak

e ra

te F

R =

NID

τ/N

ele

Mea

sure

d in

dat

a

Sel

ect e

vent

s in

the

Z m

ass

win

dow

One

ID e

lect

ron

& O

ne r

econ

stru

cted

tau

Sub

trac

t bac

kgro

und

from

sid

e-ba

ndF

ake

rate

~ 1

0-3

Mis

iden

tific

atio

n (f

ake)

rat

es

mas

s (G

eV)

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1010

EW

K M

easu

rem

ents

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1111

The

W c

ross

sec

tion

W’s

as

the

larg

est s

ourc

e of

isol

ated

taus

Bes

t cho

ice

for

unde

rsta

ndin

g τs

Tes

t of l

epto

n un

iver

salit

y!

Eve

nts

sele

cted

if

τV

isE

T>

25

GeV

& M

ET

> 3

0 G

eV

τba

ck-t

o-ba

ck w

.r.t

ME

T (

no e

xtra

jets

)A

ccep

tanc

e ~

1%

Bac

kgro

unds

QC

D m

easu

red

in Q

CD

enr

iche

d in

depe

nden

t sa

mpl

e

W→

eνfr

om fi

t to

data

Obs

erve

d:23

45B

ackg

roun

d:61

2 ±

61

σ(p

p-ba

r→W

)·B

R(W→

τν)

=

2.62

± 0

.07(

stat

) ±

0.21

(sys

t) ±

0.1

6(lu

m)

nbσ

(pp-

bar→

W)·

BR

(W→

τν)

=

2.62

± 0

.07(

stat

) ±

0.21

(sys

t) ±

0.1

6(lu

m)

nb

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1212

The

Z c

ross

sec

tion

Zas

a “

calib

ratio

n”fo

r a

num

ber

of s

earc

hes!

Gol

den

chan

nel w

ith o

ne h

adro

nic

and

one

lept

onic

tau

Eve

nts

sele

cted

if

τV

isE

T>

10

GeV

& e

lect

ron

ET

> 10

GeV

Ele

ctro

n an

d ta

uw

ith d

iffer

ent c

harg

e (O

S e

vent

s)

Acc

epta

nce

~ 5%

Dom

inan

t bac

kgro

unds

from

QC

D

τ h τ e

Jet →

τJe

t →e

Fla

t ele

ctro

n is

olat

ion

Nev

LS=

Nev

OS

Jet →

τγ→

eIs

olat

ed e

lect

rons

Nev

LS=

Nev

OS

Jet →

τW

→eν

Nev

LS<

< N

evO

S

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1313

Bac

kgro

unds

ME

Tp

pel

eT

T+

=

)co

s∆(1

ME

Tp

2m

ele

TT

ϕ−

⋅⋅

⋅=

QC

D b

ackg

roun

d su

ppre

ssed

ask

ing

for

larg

e p T

and

low

mT(e

,ME

T)

Bac

kgro

und

estim

ate

QC

D d

ijet

LS d

ata

even

ts w

ith n

on is

olat

ed e

lect

rons

γ+je

t LS

dat

a ev

ents

with

isol

ated

ele

ctro

ns

W+j

ets

MC

bas

ed e

stim

ate

Z/γ

*→ee

MC

bas

ed e

stim

ate

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1414

Sig

nal e

xtra

ctio

n4

regi

ons

in m

T(e

,ME

T)

and

elec

tron

is

olat

ion

split

into

OS

and

LS

sam

ples

Nor

mal

izat

ions

from

fit t

o da

ta

Res

ults

σ(p

p-ba

r→Z

)·B

R(Z→

ττ)

=

264

± 23

(st

at)

± 13

(sy

st)

± 15

(lu

m)

pbσ

(pp-

bar→

Z)·

BR

(Z→

ττ)

=

264

± 23

(st

at)

± 13

(sy

st)

± 15

(lu

m)

pb

Obs

erve

d:50

4B

ackg

roun

d:19

0 ±

18

OS

eve

nts

Iso

2:8

Iso

0:1

QC

DZ→

ττM

T

0:50

GeV

QC

DW

+jet

sM

T

50:1

00 G

eV

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1515

Sea

rche

s

Rec

ord

lum

ino

sity

3.15

·103

2cm

2 s-1

3.2

fb-1

on

tap

e!

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1616

MS

SM

Hig

gs s

ecto

r w

ith 2

dou

blet

s

h,H

(CP

-eve

n), A

(C

P-o

dd),

H±

h ex

pect

ed to

be

low

mas

s

tanβ

rele

vant

par

amet

er

In th

e lo

w m

ass

regi

on, h

dege

nera

te w

ith A

, at

larg

e ta

nβ

Acr

oss

sect

ion

enha

nced

by

tan2

β!

Ligh

t mas

s S

US

Y H

iggs

Hig

gs d

ecay

sbb

~90

%

ττ~

10%

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1717

Eve

nt s

elec

tion

Eve

nts

sele

cted

in th

e sa

mpl

e us

ed fo

r th

e Z→

ττcr

oss

sect

ion

mea

sure

men

tτ

Vis

ET

> 1

5(20

) G

eV&

lept

on E

T>

10

GeV

new

cha

nnel

, τeτ

µ

Bac

kgro

unds

W+

jets

Sup

pres

sed

with

ζ ζζζcu

t

Sof

t QC

DS

uppr

esse

d w

ith H

Tcu

t

Rem

aini

ng Q

CD

bac

kgro

und

τ eτ µ

chan

nel,

from

eve

nts

with

no

n-is

olat

ed le

pton

s

τ h c

hann

els,

com

pute

d fr

om

fake

rat

e pa

ram

eter

izat

ion

Z→

lles

timat

ed fr

om M

C

ME

Tp

vis

+=

ξςp

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1818

Res

ults

Sea

rch

acce

ptan

ce A

(mh=

100

GeV

) ~

1%

No

exce

ss w

.r.t

SM

pre

dict

ions

Like

lihoo

d fit

to th

e vi

s. m

ass

to s

et li

mits

thre

e fin

al s

tate

s as

sep

arat

e ch

anne

ls

back

grou

nds

subj

ect t

o ga

ussi

anco

nstr

aint

s

Rea

ch e

xten

ds b

elow

tanβ

~ 5

0 fo

r m

Ain

[120

;160

] GeV

Rea

ch e

xten

ds b

elow

tanβ

~ 5

0 fo

r m

Ain

[120

;160

] GeV

L =

1.8

fb-1

L =

1.8

fb-1

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

1919

Sta

ndar

d M

odel

Hig

gsT

he H

iggs

bos

on is

cru

cial

for

conf

irmin

g th

e S

M!

expe

cted

to b

e lo

w m

ass

( <

180

GeV

)

in th

e lo

w m

ass

regi

on, B

R (

H→

ττ)

~ 1

0%

reco

ver

acce

ptan

ce le

tting

W a

nd Z

to d

ecay

ha

dron

ical

ly

W →

lν(2

2%),

Z →

ll(6

%),

Z →

νν(2

0%)

W →

jj(6

7%),

Z →

jj(70

%)

Sea

rch

for

WH

, ZH

, VB

F H→

ττ, a

nd g

gfu

sion

in e

vent

s w

ith tw

o ta

usan

d tw

o je

tsS

earc

h fo

r W

H, Z

H, V

BF

H→

ττ, a

nd g

gfu

sion

in e

vent

s w

ith tw

o ta

usan

d tw

o je

ts

One

had

roni

can

d on

e le

pton

icta

u!

One

had

roni

can

d on

e le

pton

icta

u!

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2020

Eve

nt s

elec

tion

Eve

nts

sele

cted

if

τV

isE

T>

15

GeV

& le

pton

ET

> 1

0 G

eV

Tw

o je

ts w

ith c

orre

cted

ET

> 15

GeV

Vet

o Z

and

acc

ept e

vent

s w

ith O

S le

pton

s

Acc

epta

nce

A(m

=11

0 G

eV)

~ 5

%

Bac

kgro

unds

Dib

oson

, t-t

bar,

Dre

ll-Y

anfr

om M

C

QC

D (

dije

t,γ+

jet,W

+jet

) fr

om L

S d

ata

Cor

rect

ing

for

DY

con

trib

utio

n an

d W

+jet

char

ge c

orre

latio

n

Z→

ττcr

oss

sect

ion

mea

sure

men

t for

val

idat

ion

of b

ackg

roun

d m

odel

Bac

kgro

und

~ 37

0 ev

ents

Ver

y sm

all s

igna

l !

Bac

kgro

und

~ 37

0 ev

ents

Ver

y sm

all s

igna

l !

Dat

a: 4

00

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2121

Res

ults

Neu

ral N

etw

ork

tech

niqu

e!

Neu

ral N

etw

ork

tech

niqu

e!

Tra

in N

N fo

r m

ixed

Hig

gs s

igna

l vs

Z→

ττ(2

5% o

f bac

kgro

und,

ττ

peak

)

t-tb

ar(5

% o

f bac

kgro

und,

Q2 )

QC

D (

60%

of b

ackg

roun

d, e

nerg

y ra

nge)

Inpu

t 16

varia

bles

, ran

k w

ith it

erat

ive

met

hod

3 N

N s

core

s pe

r ev

ent,

choo

se th

e m

in. o

ne

No

exce

ss w

.r.t

SM

bac

kgro

und

L =

2.0

fb-1

L =

2.0

fb-1

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2222

Mor

e ex

otic

Hig

gs

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2323

Dou

ble

char

ged

SU

SY

Hig

gs

Left-

Rig

ht S

ymm

etric

Mod

el (

LRS

M)

Rig

ht h

ande

d w

eak

forc

e

Mec

hani

sm fo

r ge

nera

ting

neut

rino

mas

ses

Hig

gs s

ecto

r w

ith 3

new

trip

lets

10 s

cala

r bo

sons

, am

ong

whi

ch H

R/L

++/-

--

Hig

gs tr

iple

ts,

Littl

e H

iggs

mod

el

Hig

gs tr

iple

ts,

Littl

e H

iggs

mod

el

Dom

inan

t

prod

ucti

on

proc

ess

Γ ll’

~ h2

ll’⋅m

H

Yuk

awa

h ll’

give

mas

s to

neu

trin

osh l

τex

pect

ed to

be

larg

e!

CD

F E

xclu

sion

Lim

its:

m(

HL+

+/-

--)

> 1

12 (

114)

GeV

CD

F E

xclu

sion

Lim

its:

m(

HL+

+/-

--)

> 1

12 (

114)

GeV

L =

1.1

fb-1

L =

1.1

fb-1

Exc

lusi

on L

imits

: m

( H

L++

/---)

> 1

50 G

eVm

( H

R+

+/-

--)

> 1

27 G

eV

Exc

lusi

on L

imits

: m

( H

L++

/---)

> 1

50 G

eVm

( H

R+

+/-

--)

> 1

27 G

eV

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2424

In th

e M

SS

M, H

±co

uld

be li

ghte

r th

an th

e to

p

H±

from

t→bH

+

acce

ssib

le a

t Tev

atro

n!

prob

ing

mH

< m

t-mb

Top

BR

’s m

odifi

ed

Diff

eren

t top

olog

ies

in W

±an

d H

±de

cays

Cha

rged

Hig

gs

H-

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2525

New

par

ticle

s

In th

e M

SS

M, t

he li

ghte

st s

top

(t1)

can

be

very

ligh

t (la

rge

tanβ

scen

ario

s)

Ligh

ter

than

SM

top!

Dec

ay in

to τ

b t 1t 1

New

gau

ge b

oson

s

Z’,

ED

, …

Is th

e th

ird g

ener

atio

n sp

ecia

l ?

Z’,…

ττ

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2626

Tau

sat

AT

LAS

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2727

Sta

te o

f the

art

Tau

reco

nstr

uctio

n se

eded

from

cal

orim

eter

cel

l or

cha

rged

trac

k

Ene

rgy

flow

for

soft

taus

(fro

m 2

0 to

70

GeV

)

Cal

orim

eter

bas

ed is

olat

ion,

clu

ster

sha

pe a

nd

trac

k m

ultip

licity

Rad

ius

of E

M je

t

Isol

atio

n E

TE

M/E

TH

AD

0.1

<∆R

< 0

.2 fo

r E

> 7

0 G

eV

0.2

< ∆

R <

0.4

for

soft

taus

Impa

ct p

aram

eter

Cut

bas

ed o

r m

ultiv

aria

te c

lass

ifica

tion

Mis

iden

tific

atio

n ra

te a

s a

func

tion

of

jet t

ype

(qua

rk o

r gl

uon)

ener

gy a

nd η

effic

ienc

yfake rate

20<

Pt<

40G

eV40

<P

t<60

GeV

60<

Pt<

100G

eV10

0<P

t<14

0GeV

prel

imin

ary

Ligh

t Qua

rkG

luon

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2828

Hig

gs s

earc

hes

VB

F p

rodu

ctio

n w

ith H→

ττ�

For

war

d je

ts�

Col

linea

r ap

prox

imat

ion

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

2929

Con

clus

ions

The

tau

lept

on w

as d

isco

vere

d in

the

late

‘70

Ele

ctro

wea

k pr

oces

ses

invo

lvin

g ta

usar

e no

w

mea

sure

d pr

ecis

ely

CD

F (

and

D0)

est

ablis

hed

robu

st to

ols

for

iden

tifyi

ng h

adro

nica

lly

deca

ying

taus

at

hadr

onco

llide

r

Tau

spr

ovid

e in

sigh

ts in

to E

WK

sym

met

ry

brea

king

Tau

sar

e ex

celle

nt p

robe

s fo

r N

ew P

hysi

cs!

Abu

ndan

ce o

f tau

sin

SU

SY

, L-R

sym

met

ric

mod

els,

theo

ries

with

new

gau

ge b

oson

s, e

tc

Just

lim

its, s

o fa

r

But

mor

e da

ta to

com

e at

Tev

atro

n…

Whe

re is

the

Hig

gs b

oson

?W

here

is th

e H

iggs

bos

on?

And

a n

ew e

ra a

t the

LH

C!

And

a n

ew e

ra a

t the

LH

C!

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3030

Bac

kup

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3131

W a

t CD

F•

Ele

ctro

n re

ject

ion

90%

•V

isib

le m

ass

85%

QC

D

•U

se e

vent

s in

L3_

PS

100_

L1_M

ET

25

•S

elec

t onl

y ev

ents

with

taus

0.1<

EM

F<

0.9

–> a

ssum

e fla

t dis

trib

utio

n of

EM

F fo

r je

ts

W d

ecay

ing

into

ele

ctro

n+ne

utrin

o•

Low

fak

e ra

te, w

e ca

nnot

use

onl

y M

C b

ecau

se o

f lar

ge u

ncer

t

•B

ackg

roun

d if

real

ele

emitt

ed p

hoto

ns a

nd n

ot ID

as

elec

tron

->

use

the

phot

on

show

er in

form

atio

n

•T

ake

W in

to ta

uca

ndid

ates

with

EM

F >

0.9

(lik

ely

ele)

, plo

t ∆Z

(tra

ck,C

ES

) in

Wta

uM

C a

nd W

ele

MC

. Use

as

tem

plat

e, fi

t to

data

, fin

d th

e ba

ckgr

ound

SY

ST

EM

AT

ICS

•T

auID

4.5

% s

tat +

2.8

sys

•P

DF

2%

, mon

ojet

cut 2

.6%

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3232

Z a

t CD

FE

xtra

ct th

e si

gnal

:•

we

now

fit t

he e

xpec

ted

num

ber

of e

vent

s to

th

e ob

serv

atio

ns in

all

regi

ons

sim

ulta

neou

sly

and

extr

act a

ll th

e no

rmal

izat

ions

SY

ST

EM

AT

ICS

(%

)

LS e

vent

s

Iso

2:8

Iso

0:1

QC

DQ

CD

Pho

ton

+je

t

MT

0:50

GeV

QC

DW

+jet

sM

T

50:1

00 G

eV

Geo

met

rical

and

kin

emat

icac

cept

ance

(in

cl. P

DF

s) 3

.0E

lect

ron

ID 1

.9T

auID

3.0

Ele

ctro

n T

rigge

r E

ffici

ency

1.0

Tau

Trig

ger

Effi

cien

cy 1

.0T

opol

ogy

cuts

0.4

Bac

kgro

und

estim

atio

n 1.

3T

otal

: 5.0

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3333

MS

SM

h a

t CD

F

BA

CK

GR

OU

ND

SY

ST

EM

AT

IC U

NC

ER

TA

INT

IES

(%

)E

leID

2M

uon

ID 3

Tau

ID 3

Trig

ger

0.3-

1F

ake

back

grou

nd in

em

uch

anne

l 32

Fak

e ba

ckgr

ound

in ta

uch

anne

ls 6

-9T

heor

y cr

oss

sect

ion

2-13

PD

F 6

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3434

MS

SM

h a

t D0

NN

sel

ectio

n

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3535

MS

SM

h a

t D0

In th

e M

SS

M, t

he m

asse

s an

d co

uplin

gs o

f the

Hig

gs b

oson

s de

pend

on ta

n a

nd m

Aat

tree

leve

l. R

adia

tive

corr

ectio

ns in

trod

uce

addi

tiona

l dep

ende

ncie

s on

SU

SY

par

amet

ers.

In a

con

stra

ined

mod

el, w

here

un

icat

ion

of th

eS

U(2

) an

d U

(1)

gaug

ino

mas

ses

is a

ssum

ed, t

he m

ost r

elev

ant p

aram

eter

s ar

eth

e m

ixin

g p

aram

eter

Xt;

The

mas

s pa

ram

eter

;th

e ga

ugin

om

ass

term

M2;

the

glui

nom

ass

m~

g;th

e co

mm

on s

cala

r m

ass

MS

US

Y.

In th

is a

naly

sis,

the

mm

axh

and

no-m

ixin

g sc

enar

ios

are

stud

ied.

The

sce

nario

s ha

ve th

e fo

llow

ing

para

met

ers:

-m

max

h sc

enar

io:

Xt=

2 T

eV;

M2

= 0

:2 T

eV;

m~

g=

0:8

TeV

;M

SU

SY

= 1

TeV

.-

No

-mix

ing

sce

nar

io:

Xt=

0 T

eV;

M2

= 0

:2 T

eV;

m~

g=

1:6

TeV

;M

SU

SY

= 2

TeV

.

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3636

H+

+ a

t D0

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3737

SM

Hig

gs

BA

CK

GR

OU

ND

SY

ST

EM

AT

IC U

NC

ER

TA

INT

IES

(%

)T

rigge

r 0.

3-3

Ele

ID 2

Muo

nID

3T

auID

3JE

S 1

6M

C s

tat 0

.5N

orm

aliz

atio

n 2

MC

mod

el 2

0

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3838

�Search for

τ-sneutrino

�“S

ingl

e co

uplin

g do

min

ance

”

�λ’

311≠

0 an

d λ 1

32≠

0

�Lo

ok fo

r “b

ump”

in M

eµ µµµ

�M

uon

p T>

25

GeV

/c�

Ele

ctro

n E

T>

30

GeV

�S

M B

ackg

roun

d

�D

rell-

Yan

, dib

oson

, t-t

bar

Tau

sneu

trin

o(I

)

...

21'

++

=k

b ja i

ijkab

kb j

a iijk

abR

PV

DQ

LE

LL

Wλ

ελ

ε

New

!L

= 1

.0 fb

-1

New

!L

= 1

.0 fb

-1�

Lept

on n

umbe

r vi

olat

ion

obse

rved

in th

e ne

utra

l sec

tor

�R

PV

term

s ad

ded

to th

e th

eory

Wha

t if R

Pis

vio

late

d ?

Wha

t if R

Pis

vio

late

d ?

�S

M s

uppr

esse

d ve

toin

g�

even

ts w

ith s

ame

flavo

r le

pton

s

�ev

ents

with

ME

T >

15

GeV

not a

ligne

d w

ith

muo

nsor

with

mor

e th

an o

ne je

t ET

> 3

0 G

eV

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

3939

Tau

sneu

trin

o(I

I)

68D

ata

59.2

±5.3

Tot

al B

ackg

.

1.2±

0.2

WZ

1.4±

0.3

t-tb

ar

13.7

±1.5

WW

42.9

±4.2

Z/γ

*→ττ

Dat

aS

M B

ackg

r.arXiv:0711.

arXiv:0711.

arXiv:0711.

arXiv:0711.3207

3207

3207

3207

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4040

sνat

CD

F

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4141

AT

LAS

SM

H in

VB

F (

10/fb

)

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4242

Acc

epta

nce

x E

ffici

ency

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4343

H+

at L

HC

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4444

Tau

trig

gers

L1

L2

L3

•P

roce

ssor

farm

•F

ull e

vent

rec

onst

ruct

ion

•C

usto

m h

ardw

are

& c

omm

odity

pr

oces

sor

•C

alor

imet

er c

lust

erin

g, tr

ack

isol

atio

n, M

ET

•B

andw

idth

lim

itatio

ns

•C

usto

m d

esig

ned

hard

war

e

•T

rack

ing,

cal

orim

eter

tow

ers,

ME

T•

Prim

itive

s sh

ared

by

othe

r pa

ths

L3 o

utpu

t < 1

50 H

z

L2 o

utpu

t < 1

kH

z

L1 o

utpu

t < 3

0 kH

z

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4545

L2 T

autr

igge

rs

TA

UM

ET

ME

T >

20

Nar

row

isol

ated

jet E

> 1

0 G

eV

DIT

AU

Tw

o na

rrow

isol

ated

jets

E >

10

GeV

ELE

CT

RO

N &

TR

AC

KC

entr

al e

lect

ron

E >

8 G

eVIs

olat

ed tr

ack

p T>

5 G

eV

MU

ON

& T

RA

CK

Cen

tral

muo

np T

> 8

GeV

Isol

ated

trac

k p T

> 5

GeV

R =

σ⋅L

inst

R (

100⋅

E30

cm-2

s-1 )

=

14 *

100

/ 10

00 =

1.4

Hz

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4646

New

bos

ons

New

phy

sics

pre

dict

s ne

w g

auge

bo

sons

Eve

nts

with

τV

isE

T>

15

GeV

lept

on E

T>

10

GeV

Z’,…

τ h,τ

l

τ h

Vec

tor

Bos

on S

M c

oupl

ings

m(Z

’) >

399

GeV

Sca

lar

Bos

on sν

, λ’⋅B

=0.

01

m(s

ν) >

377

GeV

Vec

tor

Bos

on S

M c

oupl

ings

m(Z

’) >

399

GeV

Sca

lar

Bos

on sν

, λ’⋅B

=0.

01

m(s

ν) >

377

GeV

Obs

erve

d:4

Bac

kgro

und:

2.8

± 0.

5

Z’,

RP

V S

US

Y, E

D, …

.Z

’, R

PV

SU

SY

, ED

, ….

Bac

kgro

und

redu

ced

wit

h M

ET

cut

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4747

Dou

ble

Cha

rged

HE

vent

s co

llect

ed v

ia L

EP

TO

N&

TR

AC

K tr

igge

r τ

Vis

ET

> 1

5 G

eV&

lept

on E

T>

20

GeV

Spl

it in

to 2

exc

lusi

ve c

hann

els

+ ≥

1 is

olat

ed le

pton

can

dida

te w

ith E

T>

8 G

eV

Loos

e cu

ts y

ield

larg

e ac

cept

ance

!

Sig

nal e

xtra

ctio

n

30 <

m (

like

sign

pai

r) <

125

GeV

HT

> 1

90 G

eVin

thee

lept

on c

hann

el

HT

> 1

20 (

150)

GeV

in fo

ur le

pton

chan

nel

Bac

kgro

unds

QC

D, c

osm

ics,

W+j

ets,

Dre

ll-Y

an+j

ets

Mea

sure

d in

dat

a ev

ents

with

non

-isol

ated

lept

ons

Dib

oson

and

t-tb

arfr

om M

C

valid

ated

in c

ontr

ol r

egio

ns w

ith n

on-is

olat

ed le

pton

s an

d in

low

HT

regi

on

1 or

3 s

igna

l tra

cks

π0is

olat

ion

trac

k Is

olat

ion

mas

s <

1.8

GeV

Iso

late

d T

rack

Bac

kgro

und

from

mis

-mea

sure

d tr

acks

mig

ht c

onta

min

ate

sign

al r

egio

n.

Hig

hest

pT

trac

k :

σ(cu

rv) ≤

3⋅10

-6(s

ilic

on t

rack

s)

σ(cu

rv) ≤

7⋅10

-6(C

OT

tra

cks)

H +

+/--

- (m=1

00G

eV):

1.8

tt-b

ar:

0.06

Dre

ll-Y

an:

0.10

WZ

: 0.

09

ZZ

: 0

.02

3 le

pto

n c

han

nel

Apr

il 15

th, 2

008

Apr

il 15

th, 2

008

Tau

Lep

tons

at C

DF

, A.C

anep

aT

au L

epto

ns a

t CD

F, A

.Can

epa

4848