[PPT] - S e a r c h f o r d a r k f o r c e s w i t h PowerPoint Presentation

SLIDE 1

S e a r c h f

r

d a r k f

r

c e s w i t h K L OE

A l e k s a n d e r Ga j

s

J a g i e l l

n

i a n U n i v e r s i t y , K r a k ó w , P

l

a n d

n

b e h a l f

f

t h e K L OE a n d K L OE

2

C

l

l a b

r

a t i

n

s

ME S ON 2 1 6 J u n e 2

n d

2 1 6

SLIDE 2

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 2

Mo t i v a t i

n

f

r

d a r k f

r

c e s ' s e a r c h e s

A s t r

n
my

:

 p

s

i t r

n

e x c e s s i n t h e c

s

mi c r a y fm u x

 n

s

i mi l a r e fg e c t f

r

a n t i p r

t
n

s

 5

1 1 k e V g a mma r a y s i g n a l f r

m

t h e g a l a c t i c c e n t e r s e e n b y t h e I N T E GR A L s a t e l l i t e

 t

h e a n n u a l mo d u l a t i

n

me a s u r e d b y D A MA / L I B R A P a r t i c l e p h y s i c s :

 mu

n

ma g n e t i c mo me n t a n

ma

l y P r

p
s

e d e x p l a n a t i

n

:

 We

a k l y I n t e r a c t i n g Ma s s i v e P a r t i c l e s c h a r g e d u n d e r n e w t y p e

f

i n t e a c t i

n

 n

e w g a u g e i n t e r a c t i

n

me d i a t e d b y a n e w b

s
n

: t h e U b

s
n

( a l s

k

n

w

n a s d a r k p h

t
n

)

E u r . P h y s . J . C ( 2 1 ) 6 7 , 3 9

4

9 A s t r

n

. A s t r

p

h y s . 4 7 ( 2 3 ) L 5 5 P h y s . R e v . L e t t 1 1 ( 2 1 3 ) 1 4 1 1 2

SLIDE 3

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 3

T h e U b

s
n

( d a r k p h

t
n

) a n d i t s s e a r c h e s

 g

a u g e b

s
n
f

t h e d a r k f

r

c e s

 l

i g h t v e c t

r

b

s
n

 c

u

l d b e p r

d

u c e d i n WI MP a n n i h i l a t i

n

s

 c

u

p l e s t

a

n

r

d i n a r y p h

t
n

t h r

u

g h s ma l l k i n e t i c mi x i n g ε

2

= α' / αE

M

– k i n e t i c mi x i n g p a r a me t e r ε

2

~ 1

8

– 1

3

= > e fg e c t s

b

s e r v a b l e i n O( Ge V ) e n e r g y s c a l e c

l

l i d e r s !

 D

a l i t z d e c a y s

f

Φ :



e

+

e

–

→ Φ → η U , U → e

+

e

–

 η

→ π

+

π

–

π

 η

→ π π π

 C

n

t i n u u m p r

c

e s s e s :

 e

+

e

–

→ U γ

s e a r c h e s a t K L O E :

A n a l

g
u

s l y t

t

h e S M: S p

n

t a n e

u

s b r e a k i n g

f

t h e U ( 1 )

D

s y mme t r y = > i n t r

d

u c t i

n
f

d a r k H i g g s ( h ' )

SLIDE 4

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 4

T h e D A Φ N E Φ

f

a c t

r

y

 e

+

e

c
l

l i d e r

 fj

x e d e n e r g y

 o

fg

p

e a k

p

e r a t i

n

p

s

s i b l e

 s

e p a r a t e s t

r

a g e r i n g s f

r

e

+

a n d e

t
r

e d u c e b e a m- b e a m i n t e r a c t i

n

 2

i n t e r a c t i

n

r e g i

n

s D A Φ N E

p

e r a t i

n

s ( K L OE r u n ) :

 p

e a k l u mi n

s

i t y

f

1 . 4 · 1

3 2

c m-

2

s

1

 b

e s t d a i l y p e r f

ma

n c e : 8 . 5 p b

1

/ d a y D a t a c

l

l e c t e d b y K L OE :

 a

t Φ p e a k :

 2

1

2

~ . 5 f b

1

 2

4

5

: ~ 1 . 9 f b

1

 2

6 p b

1
fg
p

e a k D

u

b l e A n n u l a r Φ

f

a c t

r

y f

r

N i c e E x p e r i me n t s :

F

r

mo r e d e t a i l s , s e e M. S i l a r s k i ’ s t a l k

n

Mo n d a y , h i g h n

n

SLIDE 5

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 5

K L O E

2

u p g r a d e

 n

e w d e t e c t

r

s i n t h e i n t e r a c t i

n

r e g i

n

 w

i l l c

l

l e c t ~ 5 f b

1

i n t h e n e x t 2 y e a r s

T h e K L OE D e t e c t

r

L a r g e D r i f t C h a mb e r

 g

a s : 9 % H e + 1 % C

4

H

1

 R

i n n e r

= 2 5 c m, R

u

t e r

= 2 m

 σ

x y

≈ 1 5 μ m, σ

z

≈ 2 mm

 σ

( p

T

) / p

T

= . 4 % E l e c t r

ma

n g n e t i c C a l

r

i me t e r

 l

e a d a n d s c i n t i l l a t i n g fj b e r s

 h

e r me t i c c

v

e r a g e ( 9 8 % 4 π )

S u p e r c

n

d u c t i n g c

i

l

 B

= . 5 2 T

 b

a r r e l w i t h C

s

h a p e d e n d c a p s

R = 2 m

F

r

mo r e d e t a i l s , s e e M. S i l a r s k i ’ s t a l k

n

Mo n d a y , h i g h n

n

SLIDE 6

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 6

Φ → η U , U → e

+

e

–

, η → π

+

π

–

π / π π π

Φ → η U , U → π

+

π

–

π e

+

e

–

 4

t r a c k s , 2 p h

t
n

c a n d i d a t e s

 4

9 5 < Mπ

π γ γ

< 6 Me V

 7

< Mγ

γ

< 2 Me V

 5

3 5 < Mr

e c

i

l ( e e )

< 5 6 Me V

 T

F

c u t s

 b

a c k g r

u

n d c

n

t a mi n a t i

n

2 %

P h y s . L e t t . B 7 6 ( 2 1 2 ) 2 5 1 P h y s . L e t t . B 7 2 ( 2 1 3 ) 1 1 1

Φ → η U , U → π π π e

+

e

–

 2

c h a r g e d t r a c k s

 6

p r

mp

t p h

t
n

s c a n d i d a t e s , E > 7 Me V n

t

a s s

c

i a t e d t

t

r a c k

 |

T

γ

− R

γ

/ c | < mi n ( 3 σ ( t ) , 2 n s )

 a

c c e p t a n c e : | c

s

( θ

γ

) | < . 9 2

 4

< M6

γ

< 7 Me V

 b

a c k g r

u

n d c

n

t a mi n a t i

n

3 %

Φ

→ η e

+

e

–

b c g e x t r a c t e d b y a fj t p a r a me t r i s e d b y t h e V MD mo d e l

s

i g n a l e x p e c t e d a s a p e a k a b

v

e c

n

t i n u u m b a c k g r

u

n d i n Me

e

n
s

i g n a l

b

s e r v e d

C

L s t e c h n i q u e u s e d t

e

s t i ma t e t h e u p p e r l i mi t

SLIDE 7

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 7

Φ → η U , U → e

+

e

–

, η → π

+

π

–

π / π π π

ε2 < 1 . 7 × 1

5

@ 9 % C . L . f

r

3 < MU < 4 Me V ε2 < 8 × 1

6

@ 9 % C . L . f

r

5 < MU < 2 1 Me V

9 % C . L . u p p e r l i mi t

n

ε2

b

t a i n e d a s s u mi n g t h e r e l a t i

n

:

[ R e e c e ‐ Wa n g , J H E P 9 7 : 5 1 ( 2 9 ) ]

P h y s . L e t t . B 7 6 ( 2 1 2 ) 2 5 1 P h y s . L e t t . B 7 2 ( 2 1 3 ) 1 1 1

SLIDE 8

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 8

e

+

e

–

→ U γ w i t h U → μ

+

μ

–

d

a t a s a mp l e l u mi n

s

i t y 2 4 p b

1
I

S R e v e n t s f

r

a c

n

t i n u u m

f

d i mu

n

ma s s

2

t r a c k s ( 5

<

θ

μ

< 1 3

)
U

n d e t e c t e d γ ( θ

γ

< 1 5

r

θ

γ

> 1 6 5

)
H

i g h s t a t i s t i c s I S R s i g n a l

S

t r

n

g s u p p r e s s i

n
f

F S R a n d Φ →π

+

π

π
Go
d

π / μ s e p a r a t i

n

w i t h Mt

r k

a n d σ

Mt r k

c u t s

Mt

r k

“

t r a c k ma s s ” a s s u mi n g 2 e q u a l ma s s p a r t i c l e s a n d 1 p h

t
n

P h y s . L e t t . B 7 3 6 ( 2 1 4 ) 4 5 9

SLIDE 9

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 9

e

+

e

–

→ U γ w i t h U → μ

+

μ

–

 9

% C . L . u p p e r l i mi t

n

n u mb e r

f

U c a n d i d a t e s

b

t a i n e d u s i n g t h e C L s t e c h n i q u e



I – e fg . c r

s

s s e c t i

n

L – i n t e g r a t e d l u mi n

s

i t y H – r a d i a t

r

f u n c t i

n

e x t r a c t e d f r

m

P h y s . L e t t . B 7 3 6 ( 2 1 4 ) 4 5 9

ε2 < 1 . 6 × 1

5

− 8 . 7 × 1

7

@ 9 % C . L . f

r

5 2 < MU < 9 8 Me V

K L OE e + e

→μ

+ μ

γ

K L OE D a l i t z Φ →η e + e

SLIDE 10

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1

e

+

e

–

→ U γ w i t h U → e

+

e

–

d

a t a s a mp l e l u mi n

s

i t y 1 . 5 f b

1
2

t r a c k s ( 5 5

<

θ

e

< 1 2 5

)
f
p

p

s

i t e c h a r g e

d

e t e c t e d p h

t
n

( 5

<

θ

γ

< 1 3

)
h

i g h s t a t i s t i c s r a d i a t i v e B h a b h a e v e n t s i n K L OE d a t a

b

a c k g r

u

n d c

n

t a mi n a t i

n

a t p e r mi l l e v e l

r

b e t t e r

P h y s . L e t t . B 7 5 ( 2 1 5 ) 6 3 3

6

3 7

Mo t i v a t i

n

: A c c e s s t

U

b

s
n

ma s s e s a s l

w

a s 2 me

SLIDE 11

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 1

e

+

e

–

→ U γ w i t h U → e

+

e

– P h y s . L e t t . B 7 5 ( 2 1 5 ) 6 3 3

6

3 7

ε2 < 1

6

− 1

4

@ 9 % C . L . f

r

5 < MU < 5 2 Me V

K L OE ( 1 ) – D a l i t z Φ→η e + e

K

L OE ( 2 ) – e + e

→μ

+ μ

γ

K L OE ( 3 ) – e + e

→e

+ e

γ

SLIDE 12

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 2

e

+

e

–

→ U γ w i t h U → π

+

π

–

2

t r a c k s ( 5

<

θ

μ

< 1 3

)
u

n d e t e c t e d I S R γ ( θ

γ

< 1 5

r

θ

γ

> 1 6 5

)
s

t r

n

g s u p p r e s s i

n
f

F S R a n d Φ →π

+

π

π
k

i n e ma t i c c u t s

n

Mt

r k

a n d Mπ

π

Mo t i v a t i

n

: I n t h e ρ

ω

r e g i

n

d

mi

n a n t b r a n c h i n g f r a c t i

n

i n t

h

a d r

n

s l i mi t s s e n s i t i v i t y

f

l e p t

n

i c c h a n n e l s

d

e d i c a t e d s i mu l a t i

n

w i t h P H OK H A R A + GS p i

n

f

r

m f a c t

r

p a r a me t r i s a t i

n

t

d

e s c r i b e t h e ρ

ω

r e g i

n

P h y s . L e t t . B 7 5 7 ( 2 1 6 ) 3 5 6

SLIDE 13

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 3

e

+

e

–

→ U γ w i t h U → π

+

π

– P h y s . L e t t . B 7 5 7 ( 2 1 6 ) 3 5 6 K L OE ( 1 ) – D a l i t z Φ→η e + e

K

L OE ( 2 ) – e + e

→μ

+ μ

γ

K L OE ( 3 ) – e + e

→e

+ e

γ

K L OE ( 4 ) – e + e

→π+π-γ

9 % C . L . u p p e r l i mi t

n

ε2

SLIDE 14

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 4

S e a r c h f

r

d a r k H i g g s s t r a h l u n g

2 p

s

s i b l e s c e n a r i

s

:

 mh

’

> 2 mU = > h ’ →U U →4 l , π + 4 l , π

 mh

’

< mU = > h ’ e s c a p e s d e t e c t i

n

( “ i n v i s i b l e d a r k H i g g s ” )

 d

a t a u s e d :

 1

. 6 5 f b

1

a t Φ p e a k

 2

6 p b

1
fg
p

e a k ( 1 Me V )

 s

e l e c t i n g 2 mu

n

t r a c k s a n d mi s s i n g ma s s

 s

e a r c h i n g f

r

a p e a k i n t h e Mmi

s s

v s . Mμ

μ

d i s t r i b u t i

n

P h y s . L e t t . B 7 4 7 ( 2 1 5 ) 3 6 5

SLIDE 15

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 5

S e a r c h f

r

d a r k H i g g s s t r a h l u n g

 b

a y e s i a n l i mi t w a s s e t

n

t h e n u mb e r

f

s i g n a l e v e n t s a t 9 % C . L . ( N

C L = 9 %)

 L – i n t e g r a t e d l u mi n

s

i t y σ( αε2 = 1 ) – d a r k H i g g s s t r a h l u n g c r

s

s s e c t i

n

f

r

αε2 = 1

9 % C . L . u p p e r l i mi t s c

mb

i n e d f

r
n

a n d

fg
p

e a k s a mp l e s

T h e l i mi t s 1

9
1
8
n

αDε2 t r a n s l a t e t

ε <

1

4
1
3

i f αD = αe

m

P h y s . L e t t . B 7 4 7 ( 2 1 5 ) 3 6 5

SLIDE 16

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 6

S u mma r y

 T

h e K L OE e x p e r i me n t h a s c

n

t r i b u t e d t

t

h e U b

s
n

s e a r c h e s w i t h fj v e me a s u r e me n t s , e x p l

i

t i n g t h r e e p r

c

e s s e s :

 Φ

→ η U w i t h U → e

+

e

–

a n d η → π

+

π

–

π / π π π

 e

+

e

–

–

 e

+

e

–

→ U h ’ w i t h h ’ i n v i s i b l e

 N

U

b

s
n

s i g n a l w a s

b

s e r v e d

 U

p p e r l i mi t s

n

ε

2

w e r e s e t i n U b

s
n

ma s s r a n g e 5 – 9 8 Me V

 P

r e s e n t r e s u l t s l i mi t e d b y s t a t i s t i c s

 K

L OE

2

s t a r t e d t a k i n g d a t a w i t h a v i e w t

c
l

l e c t i n g 5 p b

1
f

d a t a

 We

e x p e c t t

i

mp r

v

e t h e s e n s i t i v i t y t w i c e w i t h K L O E

2

P h y s . L e t t . B 7 2 ( 2 1 3 ) 1 1 1 P h y s . L e t t . B 7 3 6 ( 2 1 4 ) 4 5 9 P h y s . L e t t . B 7 5 ( 2 1 5 ) 6 3 3 P h y s . L e t t . B 7 5 7 ( 2 1 6 ) 3 5 6 P h y s . L e t t . B 7 4 7 ( 2 1 5 ) 3 6 5

SLIDE 17

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 7

T h a n k y

u

f

r

y

u

r a t t e n t i

n

!

SLIDE 18

B a c k u p S l i d e s

SLIDE 19

2 . 6 . 2 1 6 S e a r c h f

r

d a r k f

r

c e s a t K L OE

ME

S ON 2 1 6 1 9

D e t e c t

r

u p g r a d e s :

 QC

A L T – s a mp l i n g c a l

r

i me t e r t

i

n s t r u me n t t h e fj n a l f

c

u s i n g r e g i

n

 C

C A L T – L Y S O c a l

r

i me t e r t

i

n c r e a s e a c c e p t a n c e f

r

γ

s

f r

m

I P

 n

e w I n n e r T r a c k e r

 fj

r s t c y l i n d r i c a l GE M d e t e c t

r

e v e r b u i l t

 4

l a y e r s

f

t r i p l e GE M

 i

n c r e a s e d a c c e p t a n c e f

r

l

w
p

T

t r a c k s

 I

mp r

v

e d v e r t e x i n g r e s

l

u t i

n

n e a r t h e I P

K L OE u p g r a d e t

K

L OE

2

N I MA 6 2 8 ( 2 1 1 ) , 1 9 4 N I MA 6 1 7 ( 2 1 ) , 1 5 N P B 1 9 7 ( 2 9 ) , 2 1 5

I P K L OE

2

i s s t a r t i n g

p

e r a t i

n

w i t h t h e g

a

l t

c
l

l e c t ~ 5 f b

1

i n 2

3

y e a r s

D A Φ N E u p g r a d e :

 c

r a b b e d w a i s t c

l

l i s i

n

s c h e me

 2

3

x h i g h e r l u mi n

s