LHC:

HUNT

FOR

DARK

MATTER

Teru

kiKam

on1),2)

1) Mitch

ell Institu

te for Fu

nd

amen

tal Physics an

d A

stronom

y, Texas A

&M

Un

iversity 2) W

CU

Collid

er Physics R

esearch, K

yun

gpook

Nation

al Un

iversity

1

Sean Connery

as Marko R

amius

Sum

mary

TerukiKam

on2

OOU

TL

INE

33

1)Dark M

atter and SUSY

2)LH

C & CMS D

etector3)

Re-discoveries ��SU

SY

PrologueThe

LHC

startedtaking

datafrom

proton-protoncollisions

ata

center-of-mass

energyof

7TeV

onM

arch30,

2010and

became

theenergy

frontierm

achineto

leadto

discoveriesof

newparticles.

TheStandard

Model

(SM)

iscurrently

welltested

upto

~100GeV,but

isexpected

tobreak

downin

theTeV

domain

wherenew

physicsshould

occur.Thisis

preciselythe

domain

thatwe

willstudyat

theLH

C.

New

Physics at CM

S

hhttp

://fac

ulty.p

hysic

s.tam

u.e

du

/kam

on

/rese

arch

/Co

smo

log

y_at_Co

llide

rs/h

ttp://fa

cu

lty.ph

ysics.ta

mu

.ed

u/ka

mo

n/re

sea

rch/L

HC

ph

en

o/

Phys. Lett. B 505 (2001) 161

Phys. Lett. B 538 (2002) 121

Phys. Lett. B 611 (2005) 223

Phys. Lett. B 618 (2005) 182

Eur. Phys. J. C46 (2006) 43

Phys. Lett. B 639 (2006) 46

Phys. Lett. B 649 (2007) 73

Phys. Rev. Lett. 100 (2008) 231802

Phys. Rev. D

79 (2009) 055002hep-ph/1008.3380, accepted for publication in Phys. R

ev. D (2010)

3

TA

MU

-KN

U P

hen

oP

rojects

Today,I

focuson

theoreticalmotivation

tosearch

forSU

SYdark

matter

andshow

aexperim

entalreadiness

ofthe

CMS

detectorfor

2011run.

We

havebeen

workingon

howto

determine

cosmologically-consistent

collidersignals.

Beloware

thelist

ofpapers.

4 3 2 11splitting norm

al matter and dark m

atter apart–

Another C

lear Evidence of Dark M

atter –(8/21/06)

Dark M

atter(G

ravitational Lensing)

Ordinary M

atter(N

ASA’s C

handra XO

bservatory)

time

Approxim

ately the sam

e size asthe M

ilky Way

Dark

Matter in

the U

niverse

TerukiKam

on4

yy

PPC at the LH

C

Th

e Un

iverseD

o w

e k

no

w th

e co

nte

nt o

f the

un

ive

rse?

TerukiKam

on5

PPC at the LH

C

Wilkinson M

icrowave A

nisotropy Probe (WM

AP):�

DM

= 23%W

hat is the dark matter?

An elem

entary particle?

CCa

n it b

e o

ne

of th

e kn

ow

n p

article

s?LL

et’s ch

eck o

ut!

It Doesn’t M

atter.R

ight, it doesn’t shake hand with anyone easily. Tw

o dark m

atter clusters (in blue) are just passing each other. It is a long-lived

(stable)object.

It’s a Cold M

atter.Yes, it is a “relativistically” slow

ly moving (“cold”) object.

4

It’s an Invisible Matter.

Right, it doesn’t respond to your flash light.

This means it is a neutralobject.

So, It’s a ���

����

��

�

��

��

�(C

DM

).

Pro

perties o

f Cold

Dark

Matter

TerukiKam

on6

PPC at the LH

C

Quarks,electron,m

uon,tauparticles,and

forcecarriers

cannot

bethe

darkm

atter,sincetheir

interactionsare

strongerthan

whatw

eexpect.

Neutrinos

can,buttheyhave

otherproblems.

XX

XX

XX

XX

XX

XX

XXXXTerukiKam

on7

PPC at the LH

C

CD

M in

Th

e Sta

ndard

Model?

We need an new idea beyond

the Standard Model.

Any guidance?

�e.g.,

Supersymmetry

(SUSY)

Texa

s-style SU

SY

Hu

ntin

g

TerukiKam

on8

PPC at the LH

C

© S. K

amon

SU

SY

is:

a)

Su

persym

metrized

Sta

ndard

Model

(“ Dem

ocra

tic”so

lutio

nbetw

eenFerm

ion

san

dB

oso

ns);

b)

An

elegan

tso

lutio

nto

solve

the

pro

blem

asso

ciated

with

the

Higgs

mass;

Su

persym

metry

(SU

SY

)

+

Unification!

c)B

eau

tifully

con

nectin

gth

eSta

ndard

Model

with

an

ultim

ate

un

ificatio

nof

the

fun

dam

enta

lin

teractio

ns;

d)

Cosm

olo

gically

con

sistent

with

aD

ark

Matter

can

did

ate

–sta

ble

neu

tralin

o.

01� ~

Neutral

Lightest

SUSY

Particle typeTerukiK

amon

9gg

PPC at the LH

C

ME

NU

~S

PE

CIA

LS

~

*Dark E

nerg

y Pow

er Drin

k .. $73-

Ch

ef’s choice

*Dark M

atter Sand

wich

……

$23-

Neu

tral, long-lived

*Atom

ic Soup

……

……

……

. $4-

All elem

ents in

one

No

, Sir. B

ut w

ith

ne

utra

lino

?

ME

NU

Ia

mh

un

gry.

Ca

nyo

um

ak

eth

eD

Msa

nd

wich

with

an

yS

tan

da

rdM

od

el

pa

rticle?

“Da

rk M

atte

r” Sa

nd

wich

10Teruki K

amon

Probing Supersymm

etric Connection w

ith DM

1111

LHC

annihilation

combination

Pro

bin

g E

arly U

niv

erse

I am

travelin

g a lo

t …

1

2

3

0

1212

Mitch

ell In

stitute

for

Fu

nd

am

en

tal P

hysic

s a

nd

Astro

no

my, Te

xas

A&

M U

nive

rsity

WWO

RL

D P

HY

SIC

S A

GE

NC

Y

High Energy Physics Special Agent

TERU

KI K

AM

ON

WPA C

ode: XXXX XXXX XXXX 0007(D

ark Matter H

unter)C

ode Nam

e: SUSY

Affiliations: TAMU

, KN

UO

ccupation: Professor

Current Status: AC

TIVE, TravelingC

ountry: Europe, Japan, Korea, U

SA

DO

B: unknow

nLocation: unknow

n

Ialw

ayshave

tocarry

onJapanese

passport,U

Sresidency

card,Texas

A&

Mfaculty

IDcard,

Texasstate

driverslicense

card,andK

oreanresidency

card.1313

© S. K

amon

My D

au

ghter’s Im

age o

f Dad …

27 km ring

14

Large H

adro

nC

ollid

er (LH

C)

�A

ccelerato

rto

provid

e7

-TeV

(*)pro

ton

bea

ms

from

aH

bottle;

�B

ig(2

7k

mcircu

mferen

ce);�

Cool

(1.9

Ku

sing

60

ton

sof

Liq

uid

Heliu

m);

�H

ot

(synch

rotro

nra

dia

tion

,in

med

ia);

�E

norm

ou

san

dvery

soph

isticated

magn

eticsystem

;�

Pow

erful

(14

TeV

(*)co

llision

s,Tota

lm

agn

eticen

ergysto

redis

that

of

Aero

bu

sA

380

flying

at

700

km

/h

).

Th

e LH

C is :

TerukiKam

on15

PPC at the LH

C

(*) 3.5 TeV/beam in 2010

Pow

erful to

Crea

te Massive O

bjects

TerukiKam

on16

PPC at the LH

C

14TeV

Proton-Proton Collisions

Proton Collisions 1 billion (10

9) Hz

Bunch C

rossing 40 million (10

6) Hz

7.5 m (25 ns)

On

e “disco

very” event in

10

,00

0,0

00

,00

0,0

00

14,0

00 x

mass o

f pro

ton

(14

TeV

) = C

ollisio

n E

nergy

Pro

ton

s fly at 9

9.9

99999%

of sp

eed o

f light

2808 =

Bu

nch

es/B

eam

100 b

illion

(10

11) =

Pro

ton

s/B

un

ch

Parton Collisions

New

Particles 1 Hz to 10 m

icro (10-5) H

z(H

iggs, SUSY, ....)

Discovery P

ath

at th

e LH

C

TerukiKam

on17

PPC at the LH

C

CosmologicallyConsistent Signals

10 trillion collisions

Disco

veries with

“Missin

g ET

”Standard M

odel’s CV

1973B

.S.��N

eutralcurrent@

CE

RN

SPS(400

GeV

p)1983

M.S.–

“W/Z

discovery”@

CE

RN

SppS(540

GeV

)1995

Ph.D.–

“Topdiscovery”

@Ferm

ilabTevatron

(1.8TeV

)20??

Evidence

ofSUSY-like

newphysics

inthe

jets+

ME

Tfinalstate

attheL

HC

pp

pp

W�

e�

t�W

b

Missin

g E

T(M

ET

) -in

ferrin

g n

eu

trino

s

TerukiKam

on18

PPC at the LH

C

ME

T -

infe

rring

newp

hysic

s (if th

e d

ark m

atte

r is like a

he

avy n

eu

trino

.)

Cosm

ology�

LH

C = [E

xciting Motivation]�

[Right Place&

Timing]

��

�e

b

b�

�

eb

b�

�

�slashdet �

�0

��

pected

visiblep

pp

pp

��

��

��

��

�

��

�

[Ref.] M

issing E

T

TerukiKam

on19

PPC at the LH

C

slashp

Experimentally,

wemeasure

amom

entumim

balancein

transverseplane

andcall

it“m

issingtransverse

energy”(

or).

TE

miss

TE

Th

eC

MS

(21

mx

15m

x15

m,

12,5

00

ton

ne

s)is

on

eo

ftw

osu

pe

r-fast

&su

pe

r-sen

sitive

de

tecto

rs,co

nsistin

go

f15

he

av

ye

lem

en

ts,co

llectin

gd

eb

risfro

mth

eco

llision

an

dco

nve

rting

avisu

al

ima

ge

for

us.

“Pa

rticle”

Te

lesco

pe

at

CE

RN

vs.H

ub

ble

Sp

ace

Te

lesco

pe

ino

ute

rsp

ace

Com

pact M

uon

Solen

oid

Hubble Space Telescope

TerukiKam

on20

220

08

.09

.10

: First L

HC

Be

am

21

CM

S

AL

ICE

AT

LA

S

LH

Cb

pp

AL

ICE

AAAAAAAAAAAAAAAAAAAAAALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL

IIIIIIIIIIIIIIIIIIIIIIIIIICCCCCCCCCCCCCCCCCCCCCCCCCCCCCCEEEEEEEEEEEEEEEEEEE

AT

LA

S

14:22 pm

CM

S

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCMMMMMMMMMMMMMMMMMMMMMMMMMM

SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS 19:20 pmC

MS

LH

Cb

17:59 pmLH

Cb

LH

C is B

ack

!(N

ov. 2

3, 2

00

9)

TerukiKam

on2222222222222222222

2.36 TeV…

12/06/20097

TeV…

3/30/20108

TeVin 2011-12?

20

09

.11

.23

: 90

0 GG

eV

Charged Particle M

ultiplicity

TerukiKam

on23

M=1.116 G

eV/c2

��=3.1 MeV/c

2M

=497.7 MeV/c

2

�=7.6 MeV/c

2

LHC is back!

&W

e are ready!!

���

� 0

��

p�

KK

��

��

��

�0s

K

JHEP 02 (2010) 041

Re

--Disc

ove

ries 2

00

9

7:467:46

7:157:50

9:1110:0812:46

12:3312:48

12:58

10:13

7:465

7:462

01

0.0

3.3

0: 7

TeV

24TerukiK

amon

Su

ng

hyu

n C

ha

ng

BBe

am

1(c.w

.)Be

am

2(c.c.w

.)

33

29

Ge

V3

50

0 G

eV

220

10

Ru

n (M

ar 3

0 ~

Oc

t 29

)

TerukiKam

on25

SSU

SY

Se

arc

he

s at C

MS

TerukiKam

on26

Itis

criticalto

understandthe

SMproduction

(e.g.,W

,Z,

top),since

theyare

oftendom

inantbackgrounds

fornew

particlesearches.

Iw

illgo

throughselected

topicson

theSM

analysesand

newparticle

searches:

1)D

ileptonresonances;W

andZ

bosons2)

Topquark

--------------------------------------------------------------------------------------3)

We

haveto

understandjets

–see

anexam

plein

“Searchfornew

quark-likeorgluon-like

particle:X� �

jj”4)

We

haveto

understandM

ET.5)

Rem

arkon

“particlephysics

andcosm

ology”

280 nb-1

1.1 pb-1

220

10

.08

.09

: First 1

pb

--11

(~80 x 109

pppcollisions)

1977��

�+�

–

1974J�

��

+�–

LH

C is p

ow

erfu

l en

ou

gh

to re

-disc

ove

r tho

se p

article

s in ~

4 m

on

ths.

TerukiKam

on27

1983Z�

�+�

–

WW a

nd

Z b

oso

ns

TerukiKam

on28

��

��

��

WW a

nd

Z in

�CC

ha

nn

el

�S

imu

ltan

eo

us

fitsto

ba

ckgro

un

ds

an

dsig

na

lc

on

tribu

tion

s.�

QC

Db

ackg

rou

nd

sha

pe

so

bta

ine

du

sing

data

.�

Ele

ctro

we

ak

ba

ckgro

un

dsh

ap

es

an

dsig

na

lfro

mM

C.

1.1

pb

-1

TerukiKam

on29

)4.2

(G

eV

20]

[

)1.2

(G

eV

9]

[

��

��

� �

T T

pZ

pW

WW a

nd

Z in

e C

ha

nn

el

�W

:75

%e

fficie

ncy

�Z

:9

0%

effic

ien

cy�

QC

Db

ackg

rou

nd

sha

pe

sfro

md

ata�

Ele

ctro

we

ak

ba

ckgro

un

da

nd

sign

alsh

ap

es

from

MC

TerukiKam

on30

1.1

pb

-1

)5.2

566.1

,442

.10(

GeV

20

]&

[

�� �

�

�

�

�T

pZ

W

22.9

pb

-1

TerukiKam

on31

AT

LA

Sa

rXiv:1

01

0.2

13

00

.32

pb

-12

25

0 W

’s, 17

9 Z

/�*’s ��

/�~

5%

CM

SS

oo

n2

.9 p

b-1

W a

nd

Z: R

esu

lts

TerukiKam

on32

WW a

nd

Z: to

wa

rd R

esu

lts with

35

pb

--11

TTo

p�

Pre

cise

SM

me

asu

rem

en

ts�

Gre

at

too

lto

ca

libra

ted

ete

cto

r(e

.g.,

jet

en

erg

ysc

ale

,b

-ta

gg

ing

effic

ien

cy)

�T

op

iso

ne

of

do

min

an

tB

Gs

inm

an

yn

ew

ph

ysics

sce

na

rios

(e.g

.,SU

SY

).�

Aw

ind

ow

ton

ew

ph

ysics

…

TerukiKam

on33

TTo

p DD

ilep

ton

:: Eve

nt D

ispla

y

VVe

rycle

an

ca

nd

idate

sitting

ina

reg

ion

wh

ere

we

expe

ct

very

littleb

ackg

rou

nd

!TerukiK

amon

34

μμ

+bb

+ M

ET

Ca

nd

idate

Eve

nt

z[cm

]

y [cm]

b1

b2

b2

b1

j

j

����

��

��

TE

•FF

ull se

lec

tion

ap

plie

d: Z

-bo

son

Ve

to, |M(��)-M

(Z)| >

15

Ge

V•

ME

T>

30

(20

) Ge

V in

ee, ��,

(e�) ; N

(jets)���

���T

> 3

0 G

eV

)

To

p DD

ilep

ton

: Re

sults

3.1

pb

-1

TerukiKam

on35

11

ttc

an

did

ates (5e�, 3ee

, 3��) ove

r a n

eg

ligib

le b

ackg

rou

nd

tttt _ arXiv:10

10

.59

94

, sub

mitte

d to

PL

B

w/o

N(je

ts)�����

•TTe

sting

with

KIN

em

atic (K

IN) m

eth

od

an

d M

atrix-ele

me

nt

We

igh

ting

Tech

niq

ue

(MW

T)

To

p DD

ilep

ton

: Re

sults

3.1

pb

-1

TerukiKam

on36

Co

nsiste

nt

with

top

pa

ir-pro

du

ctio

n(M

top

=1

72

.5G

eV

)�

Ma

ssm

ea

sure

me

nt

with

~4

0p

b-1

inle

pto

n+

jets+

ME

T.

TTo

p DD

ilep

ton

:: Re

sults

33.1

pb

-1

TerukiKam

on37

AT

LA

S?

??

CM

S1

01

0.5

99

4((P

LB

)3

.1p

b-1

��/�

~ 1

5%

TopLepton+Jets: Event D

isplay

Eve

nt p

asse

s all c

uts:

�1

hig

h-m

om

en

tum

ele

ctro

n�

sign

ifica

nt M

ET

����

�Ge

V�

4 h

igh

-pT

jets,

�tw

o o

f wh

ich w

ith g

oo

d/cle

ar b

-tag

s

mT (W

)��������

2

m(jj)�

102 GeV/c

2

m(jjj)�

208, 232 GeV/c

2

(for the two 3-jet com

binations) TerukiK

amon

38

e + jj

+ b

b +

ME

T C

an

did

ate E

ven

t

b1

b1

b2

b2

j1

j2

TE

j1

e

e

TTo

p L

ep

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57