[PPT] - R a r e F C N C b d e c a y s Ma r c - O l i v PowerPoint Presentation

SLIDE 1

Ma r c

O

l i v i e r B e t t l e r C a v e n d i s h L a b . C a mb r i d g e

n

b e h a l f

f

t h e L H C b c

l

l a b

r

a t i

n

, i n c l u d i n g r e s u l t s f r

m

A T L A S , C MS , B a B a r , B e l l e a n d C D F .

R a r e F C N C b d e c a y s

SLIDE 2

s l i d e 2

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

H e a v y F l a v

u

r : T w

ma

i n w a y s t

N

e w P h y s i c s

S M

N e w P h y s i c s C P v i

l

a t i

n

e x t r a s

u

r c e mu s t e x i s t

R a r e d e c a y s

p

t

e n t i a l s mo k i n g g u n F C N C d e c a y s :

f
r

b i d d e n a t t r e e l e v e l

p

r

c

e e d v i a l

p

, b

x

d i a g r a ms V i r t u a l N P p a r t i c l e s c a n c

n

t r i b u t e i n l

p

s I n d i r e c t p r

b

e c a n a c c e s s h i g h e r e n e r g y s c a l e t h a n d i r e c t s e a r c h e s

SLIDE 3

s l i d e 3

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

L a s t L H C b r e s u l t , f i r s t e v i d e n c e f

r

t h e B

s

mo d e A n g u l a r a n a l y s i s , i s

s

p i n a s y mme t r y , C P a s y mme t r y i n A n g u l a r a n a l y s i s

f

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

n
f

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

n
f

SLIDE 4

s l i d e 4

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

SLIDE 5

s l i d e 5

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

s t a t u s

A T L A S 2 . 4 f b

1

[ P L B 7 1 3 ( 2 1 2 ) 3 8 7 ] C MS 5 f b

1

[ J H E P 4 ( 2 1 2 ) 3 3 ]

[ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ] [ P R D 8 7 ( 2 1 3 ) 7 2 3 ] [ P R D 8 7 ( 2 1 3 ) 7 2 6 ]

1

9

SLIDE 6

s l i d e 6

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

a t L H C b

A n a l y s i s c

mb

i n i n g t w

d

a t a s e t s : 1 . f b

1
f

d a t a t a k e n i n 2 1 1 a t √ s = 7 T e V ( r e

a

n a l y s e d w i t h i mp r

v

e me n t s ) 1 . 1 f b

1
f

d a t a t a k e n i n 2 1 2 a t √ s = 8 T e V ( 5 %

f

a v a i l a b l e s t a t i s t i c s ) L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

SLIDE 7

s l i d e 7

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

A n a l y s i s s t r a t e g y

C l a s s i f i c a t i

n
f

a n d c a n d i d a t e s i n a 2 D s p a c e ma s s

f

t h e µµ p a i r c

mb

i n a t i

n

mu l t i v a r i a t e d i s c r i mi n a n t , B D T U s e

f

c

n

t r

l

c h a n n e l s t

c

a l i b r a t e t h e e x p e c t a t i

n

s U s e

f

n

r

ma l i s a t i

n

c h a n n e l s C

mp

a r e e x p e c t a t i

n

s w i t h

b

s e r v e d d i s t r i b u t i

n
f

e v e n t s t

s

e t a l i mi t

n

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

n

t

g

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

n

me a s u r e me n t v i a a f i t L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

B : I P , i s

l

a t i

n

, p

T , . .

mu

n

s : i s

l

a t i

n

, I P χ

2

w r t P V s , mi n ( p

T

) , . . .

SLIDE 8

s l i d e 8

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

D i s c r i mi n a n t c a l i b r a t i

n

T h e s i g n a l ma s s d i s t r i b u t i

n

i s mo d e l e d a s a G a u s s i a n ( w i t h a r a d i a t i v e t a i l ) . T h e p a r a me t e r s

f

t h i s mo d e l a r e d e t e r mi n e d f r

m

d a t a u s i n g c

n

t r

l

c h a n n e l s . T h e B D T i s t r a i n e d u s i n g s i mu l a t i

n

. B u t i t i s c a l i b r a t e d f r

m

d a t a .

P D F s i g n a l P D F i s

b

t a i n e d f r

m

c h a n n e l s w i t h s a m e t

p
l
g

y , b a c k g r

u

n d P D F i s

b

t a i n e d f r

m

f i t t

t

h e m a s s s i d e b a n d s .

L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

SLIDE 9

s l i d e 9

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

O t h e r b a c k g r

u

n d s

Ma i n b a c k g r

u

n d s

u

r c e i s c

mb

i n a t

r

i a l f r

m

b b

>

µ + µ

X
c
n

t r i b u t i

n

i n t h e s i g n a l w i n d

w

: B

( s )

>

h

+

h '

w

i t h b

t

h h a d r

n

s mi s i d e n t i f i e d . Mi s

i

d f r

m

d a t a , f

l

d e d w i t h s i mu l a t i

n

s p e c t r a .

c
n

t r i b u t i

n

t

t

h e l

w

e r ma s s s i d e b a n d : ma s s s h a p e d i f f e r e n t f r

m

e x p

n

e n t i a l , c

u

l d b i a s t h e i n t e r p

l

a t i

n
f

n

t

c

n

s i d e r e d . T h r e e c

mp
n

e n t s a d d e d t

t

h e f i t : B

>

π

µ

+

ν , B

+ ( )

>

π

+ ( )

µ

+

µ

a

n d B

( s )

>

h

+

h '

L

H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

SLIDE 10

s l i d e 1

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

N

r

ma l i s a t i

n

n

r

ma l i s a t i

n

t

P

D G f r

m

d a t a

b f r a g me n t a t i

n

me a s u r e d a t L H C b s t a b i l i t y c h e c k e d

n

8 T e V d a t a .

4 2 4 2 ± 1 5 f r

m

MC c h e c k

n

d a t a [ J H E P 4 ( 2 1 3 ) 1 ]

f

r

t h e 8 T e V d a t a s e t . L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

SLIDE 11

s l i d e 1 1

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

R e s u l t f

r

t h e B F

f

2 1 1 , 1 . f b

1

, √ s = 7 T e V 2 1 2 , 1 . 1 f b

1

, √ s = 8 T e V S i mu l t a n e

u

s u n b i n n e d l i k e l i h

d

f i t t

1

5 B D T b i n s .

C

mb

i n a t

r

i a l b k g , B

s

a n d B y i e l d f r e e . A l l

t

h e r p a r a me t e r s G a u s s i a n c

n

s t r a i n e d .

f u l l P D F

L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

SLIDE 12

s l i d e 1 2

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

R e s u l t f

r

t h e B F

f

E x c e s s

f

c a n d i d a t e s w i t h a s i g n i f i c a n c e

f

3 . 5 s t a n d a r d d e v i a t i

n

s . ( p

v

a l u e b k g

n

l y h y p . : 5 · 1

4

) F i r s t e v i d e n c e

f

t h i s d e c a y ! F

r

t h e B mo d e , n

t

s i g n i f i c a n t e x c e s s i s f

u

n d , a n u p p e r l i mi t

n

t h e B F i s s e t : c

mp

a t i b l e w i t h t h e S M p r e d i c t i

n

, a f t e r c

r

r e c t i

n

f

r

:

L H C b [ P R L 1 1 ( 2 1 3 ) 2 1 8 1 ]

[ P R L 1 9 ( 2 1 2 ) 4 1 8 1 ] [ E P J C 7 2 ( 2 1 2 ) 2 1 7 2 ]

SLIDE 13

s l i d e 1 3

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

[ L H C b

P

A P E R

2

1 2

4

9 ] A c c . P R L

I n t h e S M: n

n
r

e s

n

a n t r e s

n

n a n t u s e a s c

n

t r

l

c h a n n e l , r e mo v e d f r

m

s e a r c h I n MS S M, c

u

l d s t e m t h r

u

g h n e w s c a l a r S a n d p s e u d

s

c a l a r P s g

l

d s t i n

s

p a r t i c l e s . ( H y p e r C P mo t i v a t e d : P = 2 1 4 . 3 Me V ) N

e

x c e s s

v

e r b a c k g r

u

n d e x p e c t a t i

n

. F i r s t e x p e r i me n t a l s e a r c h L i mi t a r e s e t a t 9 5 % C L :

[ P R D 7 ( 2 4 ) 1 1 4 2 8 ]

[ P R D 8 5 ( 2 1 2 ) 7 7 7 1 ] [ P R L 9 4 ( 2 4 ) 2 1 8 1 ]

SLIDE 14

s l i d e 1 4

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

SLIDE 15

s l i d e 1 5

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

d e c a y s

F N C N p r

c

e s s e s r e p r e s e n t a v e r y r i c h e n v i r

n

me n t :

F
u

r

p

a r t i c l e s f i n a l s t a t e s a l l

w

f

r

a w e a l t h

f

a n g u l a r

b

s e r v a b l e s

E

x p e r i me n t a l l y c l e a n s i g n a t u r e s

R

a t e , a n g u l a r d i s t r i b u t i

n

s a n d a s y mme t r i e s s e n s i t i v e t

N

P

t

h e

r

e t i c a l l y w e l l p r e d i c t e d

SLIDE 16

s l i d e 1 6

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

a mp l i t u d e s

F

u

r

p

a r t i c l e f i n a l s t a t e f u l l y d e s c r i b e d b y t h r e e a n g l e s ( θl , θK , φ) a n d t h e d i mu

n

i n v a r i a n t ma s s s q u a r e d q

2

.

a p p l y f

l

d i n g ,

SLIDE 17

s l i d e 1 7

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

D i f f e r e n t i a l b r a n c h i n g f r a c t i

n

i n b i n s

f

d i mu

n

i n v a r i a n t ma s s q

2

d e t e r mi n e d w i t h n

r

ma l i s a t i

n

t

L

H C b [ P A P E R

2

1 3

1

9 ] S u b m. J H E P C MS [ B P H

1

1

9

] C D F [ P R L 1 8 ( 2 1 2 ) 8 1 8 7 ] B e l l e [ P R L 1 3 ( 2 9 ) 1 7 1 8 1 ] B a B a r [ P R D 8 6 ( 2 1 2 ) 3 2 1 2 ] T h e

r

y ( S M) [ J H E P 1 1 7 ( 2 1 2 ) 6 7 ]

SLIDE 18

s l i d e 1 8

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

L H C b [ P A P E R

2

1 3

1

9 ] S u b m. J H E P C MS [ B P H

1

1

9

] A T L A S [ C O N F

2

1 3

3

8 ] C D F [ P R L 1 8 ( 2 1 2 ) 8 1 8 7 ] B e l l e [ P R L 1 3 ( 2 9 ) 1 7 1 8 1 ] B a B a r [ P R D 8 6 ( 2 1 2 ) 3 2 1 2 ] T h e

r

y ( S M) [ J H E P 1 1 7 ( 2 1 2 ) 6 7 ]

I n t h e S M, A F B h a s a z e r

c

r

s

s i n g p

i

n t . S M p r e d i c t s q

2

v a l u e r a n g i n g 4 .

4

. 3 G e V

2

/ c

4

[ E u r . P h y s . J . C 4 1 ( 2 5 ) 1 7 3 ] [ J H E P 1 2 1 ( 2 1 2 ) 1 7 ] [ E u r . P h y s . J . C 4 7 ( 2 6 ) 6 2 5 ]

F i r s t me a s u r e me n t a t

SLIDE 19

s l i d e 1 9

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

L H C b [ P A P E R

2

1 3

1

9 ] S u b m. J H E P C D F [ P R L 1 8 ( 2 1 2 ) 8 1 8 7 ]

A n

t

h e r e x p r e s s i

n
f

t h e d e c a y b r i n g u p a l t e r n a t i v e

b

s e r v a b l e s A

T

2

a n d A

T

R e

, t h e

r

e t i c a l l y v e r y c l e a n . S e c

n

d a n g u l a r f i t t

d

e t e r mi n e t h e s e t r a n s v e r s e a mp l i t u d e s .

SLIDE 20

s l i d e 2

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

L H C b [ P R L 1 1 ( 2 1 3 ) 3 1 8 1 ] R a t i

f

2 ma g n e t p

l

a r i t i e s t

c

a n c e l d e t e c t

r

a s y mme t r i e s a n d a s c

n

t r

l

c h a n n e l t

a

c c

u

n t f

r

p r

d

u c t i

n

a s y mme t r i e s .

[ J H E P 1 ( 2 9 ) 1 9 ] [ J H E P 1 1 ( 2 1 1 ) 1 2 2 ]

C l e a n S M p r e d i c t i

n

O ( 1

3

) , u p t

.

1 5 b e y

n

d S M C

mp

a t i b l e w i t h l e s s p r e c i s e me a s u r e me n t s b y B e l l e a n d B a B a r .

[ P R L 1 3 ( 2 9 ) 1 7 1 8 1 ] [ P R D 8 6 ( 2 1 2 ) 3 2 1 2 ]

SLIDE 21

s l i d e 2 1

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

i s

s

p i n a s y mme t r y

L H C b [ J H E P 7 ( 2 1 2 ) 1 3 3 ] D e v i a t i

n

f r

m

z e r

v

e r a l l q

2

a t 4 . 4 σ . S M p r e d i c t i

n

i s c l

s

e t

z

e r

.

1 . 5 σ 1 . 9 σ 3 σ 1 . 9 σ C

n

s i s t e n t w i t h z e r

a

n d w i t h S M.

SLIDE 22

s l i d e 2 2

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

i s

s

p i n a s y mme t r y

L H C b [ J H E P 7 ( 2 1 2 ) 1 3 3 ] D e v i a t i

n

f r

m

z e r

v

e r a l l q

2

a t 4 . 4 σ . S M p r e d i c t i

n

i s c l

s

e t

z

e r

.

1 . 5 σ 1 . 9 σ 3 σ 1 . 9 σ C

n

s i s t e n t w i t h z e r

a

n d w i t h S M. C

mp

a t i b l e w i t h p r e v i

u

s me a s u r e me n t b y B a B a r , B e l l e a n d C D F .

B a B a r [ P R L 1 2 ( 2 9 ) 9 1 8 3 ] B e l l e [ P R L 1 3 ( 2 9 ) 1 7 1 8 1 ] C D F [ a r X i v : 1 3 1 . 2 2 4 4 ]

SLIDE 23

s l i d e 2 3

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

n

r

ma l i s i n g t

I

n a g r e e me n t t

S

M p r e d i c t i

n

. F i r s t s t e p t

w

a r d s a n g u l a r a n a l y s i s , t h a t s h

u

l d b e p

s

s i b l e w i t h c u r r e n t L H C b d a t a s e t .

[ L H C b

P

A P E R

2

1 3

5

] A c c . J H E P

C

mp

l e me n t a r y t

t

h e d i mu

n

mo d e : p r

b

i n g v e r y l

w

q

2

.

SLIDE 24

s l i d e 2 4

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

[ P R D 8 7 ( 2 1 3 ) 7 2 4 ]

[

P R L 1 7 ( 2 1 1 ) 2 1 8 2 ] [ C D F p u b l i c 1 8 9 4 ( 2 1 2 ) ]

S M w i t h B F = 1 6 x 1

7

S M s c a l e d t

me

a s u r e d B F

n

r

ma l i s e d t

c
mp

a t i b l e w i t h p r e v i

u

s C D F me a s u r e me n t s . T h e

r

y p r e d i c t i

n

r a n g e [ 1 4 . 5 , 1 9 . 2 ] x 1

7

w i t h u n c e r t a i n t i e s 2

3

%

[ L H C b

P

A P E R

2

1 3

1

7 ] S u b m. J H E P

SLIDE 25

s l i d e 2 5

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

[ P R D 7 1 ( 2 5 ) 1 4 2 9 ] [ J H E P 1 ( 2 9 ) 1 9 ]

O b s e r v a t i

n

s c

mp

a t i b l e w i t h S M. S M p r e d i c t i

n

s c

mp

u t e d f r

m

S M ~

[ L H C b

P

A P E R

2

1 3

1

7 ] S u b m. J H E P

SLIDE 26

s l i d e 2 6

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

( u , d , b ) i s a b a r y

n

:

n
n
z

e r

i

n i t i a l s p i n : p r

b

e h e l i c i t y s t r u c t u r e

t

h e

r

y s i d e i n n e e d f

r

c

n

s t r a i n t

L H C b

P

A P E R

2

1 3

2

5 N

r

ma l i s e d t

D

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

n

i n b i n s

f

q

2

. S i g n i f i c a n t e v i d e n c e

n

l y f

r

B a s e d

n

7 8 ± 1 2 s i g n a l d e c a y s . C

mp

a t i b l e w i t h S M a n d p r e v i

u

s me a s u r e me n t b y C D F [ P R L 1 7 ( 2 1 1 ) 2 1 8 2 ]

P r e l i mi n a r y

SLIDE 27

s l i d e 2 7

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

L H C b

P

A P E R

2

1 3

2

5 D i f f e r e n t i a l b r a n c h i n g f r a c t i

n

i n b i n s

f

q

2

. S i g n i f i c a n t e v i d e n c e

n

l y f

r

: l i mi t s a r e c

mp

u t e d f

r

t h e l

w

e r b i n s .

B i n n e d S M a t 9 % C L .

[ P R D 8 7 ( 2 1 2 ) 7 4 5 2 ]

C

mp

a t i b l e w i t h p r e v i

u

s me a s u r e me n t b y C D F [ P R L 1 7 ( 2 1 1 ) 2 1 8 2 ]

P r e l i mi n a r y

SLIDE 28

s l i d e 2 8

November 11 2011

B F C N C d e c a y s Ma r c

O

l i v i e r B e t t l e r

C

n

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