[PPT] - R e c e n t r e s u l t s a n d p r o s p e c PowerPoint Presentation

SLIDE 1

R e c e n t r e s u l t s a n d p r

s

p e c t s f r

m

t h e N A 6 2 e x p e r i m e n t a t C E R N

K a r i m Ma s s r i – C E R N

( e m a i l : k a r i m . m a s s r i @ c e r n . c h ) P a r t i c l e p h y s i c s s e m i n a r – B i r m i n g h a m – 1 2 / 2 / 2 2

SLIDE 2

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 2 The K+→p+nn decay

K

+

→p+ nn: Mo t i v a t i

n

s & T h e

r

y

S M p r e d i c t i

n

: B R ( K

+

→p+ nn) = ( . 8 4 ± . 1 ) × 1

– 1

B u r a s e t a l . , J H E P 1 5 1 1 ( 2 1 5 ) 3 3 .

D
m

i n a t e d b y s h

r

t

d

i s t a n c e c

n

t r i b u t i

n

( t

p

q u a r k )

t

q u a r k c

n

t r i b u t i

n

@ N L O Q C D a n d 2

l
p

E W c

r

r e c t i

n

s , c q u a r k @ N N L O Q C D a n d 1

l
p

E W c

r

r e c t i

n

s

H

a d r

n

i c m a t r i x e l e m e n t f r

m

B R ( K

±

→e

±

π ν ) h i g h

p

r e c i s i

n

t h e

r

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

n
F

C N C f

r

b i d d e n a t t r e e l e v e l : 1

l
p

c

n

t r i b u t i

n

s a s l e a d i n g

r

d e r

H

i g h l y C K M s u p p r e s s e d : B R ( K

+

→π

+

ν ν ) ~ | V

t s *

V

t d

|

2

~ λ10 h i g h s e n s i t i v i t y t

n

e w p h y s i c s

Me

a s u r e m e n t

f

| V

t d

| c

m

p l e m e n t a r y t

t

h

s

e f r

m

B − B m i x i n g

r

B →ργ

C
n

s t r a i n t s

n

C K M u n i t a r y t r i a n g l e

SLIDE 3

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 3 The K+→p+nn decay

K

+

→p+ nn: N e w P h y s i c s s c e n a r i

s
C

u s t

d

i a l R a n d a l l

S

u n d r u m [ B l a n k e e t a l . , J H E P 9 3 ( 2 9 ) 1 8 ]

MS

S M a n a l y e s [ B l a z e k a n d Ma t a k , I n t . J . Mo d . P h y s . A 2 9 ( 2 1 4 ) 1 4 5 1 6 2 ] [ I s i d

r

i e t a l . , J H E P 6 8 ( 2 6 ) 6 4 ]

S

i m p l i fj e d Z , Z ' m

d

e l s [ B u r a s , B u t t a z z

,

K n e g j e n s , J H E P 1 5 1 1 ( 2 1 5 ) 1 6 6 ]

L

i t t l e s t H i g g s w i t h T

P

a r i t y [ B l a n k e e t a l . , E P J C 7 6 ( 2 1 6 ) 1 8 2 ]

L

F U v i

l

a t i

n

m

d

e l s [ I s i d

r

i e t a l . , E P J C 7 7 ( 2 1 7 ) 6 1 8 ]

C
n

s t r a i n t s f r

m

e x i s t i n g m e a s u r e m e n t s ( c

r

r e l a t i

n

s m

d

e l d e p e n d e n t )

K a

n

m i x i n g , C K M e l e m e n t s , K , B r a r e m e s

n

d e c a y s , N P l i m i t s f r

m

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

R a n d a l l

S

u n d r u m Z ' ( 5 T e V ) i n C

n

s t r a i n e d M F V L F U v i

l

a t i

n

SLIDE 4

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 4 The K+→p+nn decay

K

+

→p+ nn: E x p e r i m e n t a l R e s u l t s

D e c a y

a

t

r

e s t t e c h n i q u e D e c a y

i

n

fm

i g h t t e c h n i q u e

N A 6 2 ( 2 1 6 d a t a ) B R ( K

+

→p+ nn) = ( 1 . 7 3

+ 1 . 1 5

) × 1

– 1

E 7 8 7 / E 9 4 9 , P R L 1 1 ( 2 8 ) 1 9 1 8 2

– 1 . 5

B R ( K

+

→p+ nn) < 1 4 × 1

– 1

@ 9 5 % C L N A 6 2 , P h y s . L e t t . B 7 9 1 ( 2 1 9 ) 1 5 6

SLIDE 5

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 5

History of NA48/NA62 experiments

1997 ¯ 2001 NA48 (KS/KL) Re ε′/ε Discovery of direct CPV 2002 NA48/1 (KS/hyperons) Rare KS and hyperon decays 2003 ¯ 2004 NA48/2 (K+/K–) Direct CPV, Rare K+/K- decays 2007 ¯ 2008 NA62-RK (K+/K–) RK = K±

e2/K± m2,

Rare K+/K– decays 2016 ¯

NA62 (K+)

K+→p+nn, Rare K+ and p0 decays

T h e N A 6 2 e x p e r i m e n t @ C E R N

N A 6 2 : c u r r e n t l y ~ 2 p a r t i c i p a n t s , 2 9 i n s t i t u t i

n

s f r

m

1 2 c

u

n t r i e s N A 6 2 i s t h e l a s t f r

m

a l

n

g t r a d i t i

n
f

fj x e d

t

a r g e t K a

n

e x p e r i m e n t s i n t h e C E R N N

r

t h A r e a

The NA62 experiment

SLIDE 6

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 6 The NA62 experiment

K

+

→p+nn s i g n a t u r e :

K a

n

t r a c k + P i

n

t r a c k + N O T H I N G E L S E

N A 6 2 K e y s t

n

e s :

– P r e c i s e t r a c k i n g – P a r t i c l e I D ( i n p a r t i c u l a r p/ m) – P h

t
n

r e j e c t i

n

– P r e c i s e t i m i n g ~ O ( 1 p s )

B a c k g r

u

n d r e j e c t i

n

a t ~ 1

1 1

l e v e l

K

+

→p+ nn i n N A 6 2 : s t r a t e g y

SLIDE 7

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 7

4 G e V / c p r i m a r y S P S p r

t
n

s ( ~ 2 ´ 1

1 2

/ s p i l l )

T h e N A 6 2 b e a m a n d d e t e c t

r

The NA62 experiment

S e c

n

d a r y h a d r

n

b e a m :

C
m

p

s

i t i

n

: K

+

( 6 % ) / p+ ( 7 % ) / p ( 2 4 % )

p

= 7 5 G e V / c , Dp / p ~ 1 %

1

mr a d d i v e r g e n c e ( R MS )

6

´ 3 m m

2

t r a n s v e r s e s i z e

I

n t e n s i t y : 7 5 MH z ( 4 5 MH z K

+

)

D e c a y r e g i

n

:

6

m l

n

g fj d u c i a l v

l

u m e

V

a c u u m ~ O ( 1

– 6

m b a r )

~

5 MH z K

+

d e c a y r a t e

SLIDE 8

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 8

T h e N A 6 2 b e a m a n d d e t e c t

r

The NA62 experiment

. . . a n d t h i s i s h

w

i t r e a l l y l

k

s !

SLIDE 9

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 9

T h e 2 1 6 – 2 1 8 D a t a S a m p l e

1 % n

m

i n a l i n t e n s i t y [ = 7 5 MH z h a d r

n

b e a m ]

Search for the K+→p+nn decay

T r i g g e r m a s k D

w

n s c a l e pnn 1 2m 2 e , m u l t i

t

r a c k 8 m, m u l t i

t

r a c k 1 Mu l t i

t

r a c k 5

1

N

n
m

2 Mi n i m u m b i a s 4 . . . ~ 5 5 % n

m

i n a l i n t e n s i t y ~ 6 5 % n

m

i n a l i n t e n s i t y ~ 4 %

F u l l 2 1 6

2

1 8 s a m p l e : ~ 5

´

1

1 2

k a

n

d e c a y s , ~ 3 P B

f

r a w d a t a

n

d i s k O ( 1 ) t r i g g e r s t r e a m s , b r

a

d p h y s i c s r e a c h

SLIDE 10

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 10

m

2

p0

4 m

2

p+

K+→p+p+p– K+→p+p0 K+→m+n

R e g i

n

I R e g i

n

I I

S i g n a l s e l e c t i

n

K+→p+nn selection

K

+

d e c a y s i n t h e fj d u c i a l v

l

u m e , M i n i m u m b i a s t r i g g e r

S e l e c t i

n

c r i t e r i a :

S

i n g l e t r a c k t

p
l
g

y

p+

i d e n t i fj c a t i

n
P

h

t
n

r e j e c t i

n
Mu

l t i

t

r a c k r e j e c t i

n

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

S i g n a l a n d C

n

t r

l

R e g i

n

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

u

g h

u

t t h e a n a l y s i s

SLIDE 11

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 11

N A 6 2 K e y s t

n

e 1 : P r e c i s e t r a c k i n g

D e s i g n v a l u e !

Search for the K+→p+nn decay

m

2 m i s s

r e s

l

u t i

n

:

s( m

2 m i s s

) = 1

– 3

G e V

2

/ c

4

SLIDE 12

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 12

N A 6 2 K e y s t

n

e 2 : P a r t i c l e I D

Search for the K+→p+nn decay

T

t

a l P I D p e r f

r

m a n c e : e( m+ ) = 1

– 8

, e( p+ ) = 6 4 % C a l

r

i m e t r i c P I D R I C H P I D

Ma

c h i n e l e a r n i n g a p p r

a

c h ( B D T )

– E n e r g y d e p

s

i t i

n

– E n e r g y s h a r i n g – S h

w

e r s h a p e p r

fj

l e s

T

r a c k

d

r i v e n l i k e l i h

d

d i s c r i m i n a n t f

r

p / m / e s e p a r a t i

n
P

a r t i c l e m a s s u s i n g t r a c k m

m

e n t u m e( m+ ) = 6 . 3 ´1

– 6

, e( p+ ) = 7 8 % e( m+ ) = 2 . 3 ´1

– 3

, e( p+ ) = 8 2 %

SLIDE 13

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 13

N A 6 2 K e y s t

n

e 3 : P h

t
n

r e j e c t i

n

Search for the K+→p+nn decay

T

t

a l p0 r e j e c t i

n

:

e( p0 ) = ( 1 . 4 ± . 1 ) ´ 1

– 8

SLIDE 14

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 14

N A 6 2 K e y s t

n

e 4 : P r e c i s e t i m i n g

Search for the K+→p+nn decay

S p r e a d ~ 5 p s C e n t r a l v a l u e R e s

l

u t i

n

S p r e a d ~ 1 p s

E

x c e l l e n t a u t

m

a t i c t i m e c a l i b r a t i

n

a t t h e p r

c

e s s i n g l e v e l

S

t a b l e c e n t r a l v a l u e a n d t i m e r e s

l

u t i

n

( w i t h i n f e w p s )

S

i n g l e

d

e t e c t

r

t i m e r e s

l

u t i

n

~ 9 p s T i m e c a l i b r a t i

n

s t a b i l i t y

SLIDE 15

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 15

S i n g l e E v e n t S e n s i t i v i t y ( S E S )

K+→p+nn selection

< eR

V

>

2 1 7

= . 6 3 8 ± . 1 4

SLIDE 16

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 16

K

+

→p+ p0 ( g) b a c k g r

u

n d

Background studies

N

pp(g*g)

= . 2 9 ± . 3

s t a t

± . 3

s y s t

b k g

D a t a d r i v e n b a c k g r

u

n d e s t i m a t i

n

SLIDE 17

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 17 Background studies

D a t a d r i v e n b a c k g r

u

n d e s t i m a t i

n

K

+

→m+ n( g) b a c k g r

u

n d

N

mn(g*g)

= . 1 5 ± . 2

s t a t

± . 4

s y s t

b k g

SLIDE 18

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 18

K

+

→p+ p– e

+

n ( K

e 4

) b a c k g r

u

n d

B

a c k g r

u

n d e s t i m a t e d w i t h 2

´109

MC g e n e r a t e d K

+

→p+ p– e

+

n d e c a y s

G
d

a g r e e m e n t a c r

s

s t h e 4 v a l i d a t i

n

s a m p l e s

Background studies

MC s i m u l a t i

n

N

K e 4

= . 1 2 ± . 5

s t a t

± . 3

s y s t

b k g

SLIDE 19

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 19

U p s t r e a m b a c k g r

u

n d

Background studies

N

u p s t r e a m

= . 9 ± . 2

s t a t

± . 2

s y s t

b k g

D

a t a d r i v e n b a c k g r

u

n d e s t i m a t i

n
G
d

a g r e e m e n t a c r

s

s t h e 7 v a l i d a t i

n

s a m p l e s

D

e c a y s a l

n

g t h e b e a m l i n e ; b e a m p a r t i c l e i n t e r a c t i

n

s i n G T K

R

a n d

m

t r a c k m a t c h e d i n G T K a n d /

r

p

s

s i b l e a d d i t i

n

a l e n e r g y n

t

d e t e c t e d

SLIDE 20

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 20

T

t

a l e x p e c t e d b a c k g r

u

n d

Background studies

SLIDE 21

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 21

R e s u l t s

Results

O p e n i n g t h e b

x

. .

SLIDE 22

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 22

R e s u l t s

Results

O p e n i n g t h e b

x

. .

SLIDE 23

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 23

R e s u l t s

Results G I M m e c h a n i s m B – B

s

c i l l a t i

n

s t q u a r k K

l 3

– K

π ν ν

F F r e l a t i

n

2 1 6 + 2 1 7 N A 6 2 r e s u l t ( 3 c a n d i d a t e s ) : B R ( K

+

→p+ nn) < 1 . 8 5 × 1

– 1

@ 9 % C L B R ( K

+

→p+ nn) = . 4 7 × 1

– 1 + . 7 2

.

4 7

SLIDE 24

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 24

R e s u l t s

Results

2 1 6 + 2 1 7 N A 6 2 r e s u l t ( 3 c a n d i d a t e s ) : B R ( K

+

→p+ nn) < 1 . 8 5 × 1

– 1

@ 9 % C L B R ( K

+

→p+ nn) = . 4 7 × 1

– 1 + . 7 2

.

4 7

C

m

p e t i t i v e a l s

n

B R ( K

L

→ π ν ν ) ( v i a G r

s

s m a n

N

i r b

u

n d ) B R ( K

L

→ π ν ν ) < 8 . 1 4 × 1

– 1

@ 9 % C L

SLIDE 25

Karim Massri – NA62 Collaboration Meeting – GMU 31/08/2017 25

H

e l i c i t y s u p p r e s s e d : h i g h s e n s i t i v i t y t

n

e w p h y s i c s H i g h

p

r e c i s i

n

t h e

r

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

n

:

H

a d r

n

i c u n c e r t a i n t i e s c a n c e l i n t h e R

K

r a t i

R

a d i a t i v e c

r

r e c t i

n

s @ O ( e

2

p

4

) C h P T S M p r e d i c t i

n

: R

K S M

= ( 2 . 4 7 7 ± . 1 ) × 1

– 5

C i r i g l i a n

a

n d R

s

e l l , P R L 9 9 ( 2 7 ) 2 3 1 8 1

Wider programme – Lepton universality test

L e p t

n

u n i v e r s a l i t y t e s t

H e l i c i t y s u p p r e s s i

n

: ~ 1

– 5

R a d i a t i v e c

r

r e c t i

n

( w e l l k n

w

n , f e w % )

L e p t

n

u n i v e r s a l i t y t e s t

R

K

= G( K

e 2

) / G( K

m2

) = ( 2 . 4 8 8 ± . 7

s t a t

± . 7

s y s t

) × 1

– 5

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

B e s t m e a s u r e m e n t f r

m

N A 6 2 2 7 d a t a ( N A 4 8 / 2 d e t e c t

r

) :

SLIDE 26

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 26

L e p t

n

u n i v e r s a l i t y t e s t

Wider programme – Lepton universality test

2007 data, NA48 detector 2017 data, NA62 detector

N

v

e l a p p r

a

c h : c

l

l e c t K

e 2

a n d K

μ 2

i n s a m e t r i g g e r s t r e a m ( t r i c k : l

k

a t K

μ 2

w i t h s u b s e q u e n t μ

+

→e

+

ν ν d e c a y ! )

SLIDE 27

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 27

S e a r c h f

r

H e a v y N e u t r a l L e p t

n

s

Wider programme – Search for Heavy Neutral Leptons K+ m+n, m+ e+nn

K+ e+n,

1.1M candidates

HNL search region K+ m+n,

2M candidates

HNL search region

|Uℓ4|2 limits vs mHNL from production searches

H N L s i g n a l : a s p i k e a b

v

e c

n

t i n u

u

s m i s s i n g m a s s s p e c t r u m

N e w p r e l i m i n a r y N A 6 2 r e s u l t s b a s e d

n

~ 1 / 3

f

t h e d a t a s e t ( 2 1 6

2

1 7 )

SLIDE 28

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 28

I n v i s i b l e V e c t

r

B

s
n

f r

m

p0 d e c a y

Wider programme – Dark photon

P r

s

p e c t s w i t h f u l l d a t a s e t : e x p e c t e d y i e l d i n c r e a s e d b y O ( 1 )

K

+

→p+ p0 , p0 →A ' g, A ' →i n v i s i b l e

Mi n i m a l A ’ s c e n a r i

:

D a t a f r

m

2 1 6 , ~ 4 1 2 M π s t a g g e d f r

m

K 2 π d e c a y s ( 1 %

f

f u l l d a t a s e t ) P e a k s e a r c h a r

u

n d m

2 A ’

i n t h e M

2 m i s s

= ( p

K

– p

π

– p

γ

)

2

Journal of High Energy Physics, Volume 2019, Issue 05, page 182

J H E P 1 9 5 ( 2 1 9 ) 1 8 2

SLIDE 29

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 29

L e p t

n

N u m b e r / L e p t

n

F l a v

u

r v i

l

a t i

n

Wider programme – LNV/LFV

Acceptance: A = 4.98% SES = (0.94 ± 0.03) * 10

10

Expected background: 0.16 ± 0.03 Nobs=

Acceptance: A =

9.81% SES = (1.28 ± 0.04) * 10

11

Expected background: 0.91 ± 0.41 Nobs = 1

S e a r c h f

r

L N V K

+

→π

–

e

+

e

+

a n d K

+

→π

–

μ

+

μ

+

d e c a y s w i t h 2 1 7 d a t a x 2

3

i m p r

v

e m e n t s w r t p r e v i

u

s r e s u l t s P r

s

p e c t s : F u r t h e r x 3 i m p r

v

e m e n t e x p e c t e d w i t h f u l l 2 1 6

2

1 8 s a m p l e O b t a i n e d u p p e r l i m i t s B R ( K

+

→π

–

e

+

e

+

) < 2 . 2 x 1

1

@ 9 % C L B R ( K

+

→π

–

μ

+

μ

+

) < 4 . 2 x 1

1

1

@ 9 % C L

e e , S M μ μ , S M μ μ , L N V e e , L N V

P L B 7 9 7 ( 2 1 9 ) 1 3 4 7 9 4

SLIDE 30

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 30

P r

s

p e c t s – 2 1 6

2

1 8 d a t a s e t

Prospects – Short Term

K

+

→p+ nn

2

1 8 d a t a a n a l y s i s i n p r

g

r e s s ( ~ 2 x 2 1 7 d a t a )

Wi

d e r fj n a l c

l

l i m a t

r

i n s t a l l e d d u r i n g 2 1 8 , l

w

e r u p s t r e a m b a c k g r

u

n d

O

n

g
i

n g s t u d i e s t

i

n c r e a s e s i g n a l e ffj c i e n c y

O

p t i m i z a t i

n
f

p a r t i c l e i d e n t i fj c a t i

n

a n d k i n e m a t i c s e l e c t i

n
I

m p r

v

e m e n t i n k a

n
p

i

n

a s s

c

i a t i

n

a l g

r

i t h m

Wi t h i m p r

v

e m e n t f a c t

r

, e x p e c t ~ 1 S M e v e n t s i n 2 1 6

2

1 8 d a t a

B

r

a

d e r p h y s i c s p r

g

r a m m e

R

a r e & f

r

b i d d e n d e c a y a n a l y s e s w i t h f u l l 2 1 6

2

1 8 s a m p l e i n p r

g

r e s s

S

u b s t a n t i a l i m p r

v

e m e n t s e x p e c t e d i n H N L , L N V / L F V a n d e x

t

i c s e a r c h e s

SLIDE 31

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 31

P r

s

p e c t s – N e x t r u n ( 2 2 1

2

2 4 )

Prospects – Medium Term

t

c
n

t i n u e N A 6 2 d a t a t a k i n g d u r i n g t h e p e r i

d

a f t e r C E R N A c c e l e r a t

r

s L

n

g S h u t d

w

n 2 ( L S 2 ) a n d b e f

r

e L

n

g S h u t d

w

n 3 ( L S 3 )

O

( 5 ) K

+

→p+ nn e v e n t s e x p e c t e d

B

R ( K

+

→p+ nn) w i t h ~ 2 % a c c u r a c y

O

( 1 ) S E S i n c r e a s e

n

s e v e r a l r a r e a n d f

r

b i d d e n k a

n

d e c a y s

A d d e n d u m I t

P

3 2 6 s u b m i t t e d i n O c t

b

e r 2 1 9 t

S

P S C

S P S C r e c

m

m e n d e d a p p r

v

a l

f

N A 6 2

p

e r a t i

n

a f t e r L S 2 ( D a t a t a k i n g i n 2 2 1 h a s b e e n a p p r

v

e d )

SLIDE 32

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 32 Prospects – Medium Term

P l a n n e d a c t i

n

s :

T

a k e d a t a a t h i g h e r i n t e n s i t y , a i m i n g f

r

1 % n

m

i n a l

R

e d u c e b a c k g r

u

n d c

n

t a m i n a t i

n

:

a

d d G T K 4 : b e t t e r t r a c k fj t t i n g w i t h h i g h e r e ffj c i e n c y , i d e n t i f y p i l e u p t r a c k s

m
d

i f y b e a m l i n e a n d a d d a n t i

c
u

n t e r t

r

e d u c e u p s t r e a m b a c k g r

u

n d

n

e w H A S C m

d

u l e t

i

m p r

v

e b a c k g r

u

n d r e j e c t i

n
R

e d u c e r a n d

m

v e t

,

i m p r

v

i n g t r e a t m e n t

f

a c c i d e n t a l a c t i v i t y a n d e x p l

i

t i n g d e t e c t

r

c

r

r e l a t i

n

s

I

n c r e a s e s i g n a l a c c e p t a n c e f u r t h e r ( e . g . d i fg e r e n t s e l e c t i

n

s f

r

2 S R s )

P r

s

p e c t s – N e x t r u n ( 2 2 1

2

2 4 )

SLIDE 33

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 33 Prospects – Medium Term

Wi d e p r

g

r a m m e

f

r a r e a n d f

r

b i d d e n p r

c

e s s e s

T r i g g e r a n d D A Q i m p r

v

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

w

r e d u c t i

n
f

p r e

s

c a l i n g f a c t

r

s a n d c

l

l e c t i

n
f

e v e n l a r g e r d a t a s a m p l e s E n t e r a n e w h i g h p r e c i s i

n

e r a , d

w

n t

1
1

2

+ C

n

t r

l
f

s y s t e m a t i c s w i t h d a t a

d

r i v e n m e t h

d

s : C

l

l e c t s p e c i a l s a m p l e s t

a

d d r e s s s p e c i fj c e fg e c t s a n d b a c k g r

u

n d s

u

r c e s

P r

s

p e c t s – N e x t r u n ( 2 2 1

2

2 4 )

SLIDE 34

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 34 Prospects – Medium Term

P r

s

p e c t s – N e x t r u n ( 2 2 1

2

2 4 )

N A 6 2 i n d u m p m

d

e

L

n

g d e c a y v

l

u m e a n d d e t e c t

r

c h a r a c t e r i s t i c s / p e r f

r

m a n c e s : s u i t a b l e t

s

e a r c h f

r

f e e b l y

i

n t e r a c t i n g l

n

g

l

i v e d p a r t i c l e s E x t e n d D a r k P a r t i c l e m a s s r a n g e b e y

n

d m

K

( D , B a s s

c

i a t e d p r

d

u c t i

n

) C

l

l e c t 1

1 8

P r

t
n

s O n T a r g e t b e f

r

e L S 3 N e w A N T I u n d e r c

n

s t r u c t i

n

t

v

e t

m

u

n

s p r

d

u c e d i n T A X P

s

s i b i l i t y t

i

n c r e a s e b e a m i n t e n s i t y b e y

n

d n

m

i n a l b e i n g i n v e s t i g a t e d

SLIDE 35

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 35 Prospects – Medium Term

P r

s

p e c t s – N e x t r u n ( 2 2 1

2

2 4 )

N A 6 2 i n d u m p m

d

e

S e n s i t i v i t y s t u d i e s i n c l u d e d i n P h y s i c s B e y

n

d C

l

l i d e r i n i t i a t i v e B r i d g e t

w

a r d s f u t u r e d u m p f a c i l i t i e s

SLIDE 36

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 36 Prospects – Long Term

P r

s

p e c t s – A f t e r 2 2 6

J

r

g e n D ' H

n

d t ( C h a i r

f

t h e E u r

p

e a n C

m

m i t t e e f

r

F u t u r e A c c e l e r a t

r

s ) , f r

m

t h e t a l k “ E U S t r a t e g y s c e n a r i

”

( h t t p s : / / i n d i c

.

c e r n . c h / e v e n t / 8 4 5 5 4 / )

SLIDE 37

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 37 Prospects – Long Term

L

n

g

T

e r m F u t u r e a n d t h e b i g p i c t u r e : h i g h i n t e n s i t y k a

n

b e a m s b e y

n

d 2 2 6 B R ( K

+

→p+ nn) w i t h p r e c i s i

n

< 1 % c a n t e s t N e w P h y s i c s u p t

O

( 1 T e V ) i n a m

d

e l

i

n d e p e n d e n t w a y Me a s u r i n g b

t

h c h a r g e d a n d n e u t r a l m

d

e s c a n g i v e i n s i g h t a b

u

t t h e n e w p h y s i c s fm a v

u

r s t r u c t u r e T h e m

s

t i n t e n s e k a

n

f a c i l i t y : 4 x K

+

, 6 x K

L

i n t e n s i t y L i m i t e d b y r a d i

p

r

t

e c t i

n

i s s u e s L a r g e c

m

m

n

a l i t y

f

u p g r a d e s r e q u i r e d , t w

a

s p e c t s / p h a s e s

f

t h e s a m e k a

n

f a c i l i t y T h e d e c a y

i

n

fm

i g h t t e c h n i q u e s w

r

k s f

r

K

+

→p+ nn B u t s e t u p n e e d s t

b

e m a d e r e s i l i e n t t

i

n t e n s i t y e fg e c t s C h a l l e n g e s : T i m e r e s

l

u t i

n

O ( < 4 p s ) , h i g h fm u x

f

p a r t i c l e s → R & D s y n e r g y w i t h L H C H i L u m i

P r

s

p e c t s – A f t e r 2 2 6

SLIDE 38

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 38 Prospects – Long Term

P r

s

p e c t s – A f t e r 2 2 6

B r

a

d e r p h y s i c s p r

g

r a m m e Wh i t e p a p e r i n p r e p a r a t i

n

SLIDE 39

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 39

C

n

c l u s i

n

s

K a

n

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

b

e f

r

N e w P h y s i c s

N

A 6 2 m e a s u r e m e n t

f

K

+

→p+ nn

– 2 1 6 + 2 1 7 r e s u l t r e l e a s e d : B R ( K

+

→p+ nn) < 1 . 8 5 × 1

– 1

@ 9 % C L – C

n

s t r a i n t s

n

t h e l a r g e s t e n h a n c e m e n t s a l l

w

e d b y N P m

d

e l s – 2 1 8 d a t a a n a l y s i s

n
g
i

n g – E x c e l l e n t p r

s

p e c t s f

r

a f t e r L S 2

B

r

a

d e r N A 6 2 p h y s i c s p r

g

r a m m e :

– L e p t

n

u n i v e r s a l i t y ( R

K

) – L N V / L F V k a

n

d e c a y s – S e a r c h f

r

e x

t

i c p a r t i c l e s ( H N L , D a r k p h

t
n

, A L P s )

P

r

s

p e c t s : –

R e q u e s t f

r

e x t e n d e d d a t a t a k i n g ( 2 2 1 → 2 2 4 ) w e l l r e c e i v e d – D a t a t a k i n g i n 2 2 1 h a s a l r e a d y b e e n a p p r

v

e d – N e x t g e n e r a t i

n

K a

n

b e a m s : a p

w

e r f u l t

l

t

b

r e a k t h e S t a n d a r d Mo d e l – P r

g

r a m m e

f

K

+

a n d K

L

e x p e r i m e n t s a t C E R N

Conclusions

SLIDE 40

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 40

S p a r e s

SLIDE 41

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 41

T h e K 1 2 h i g h

i

n t e n s i t y K

+

b e a m l i n e

The NA62 experiment

P r i m a r y S P S p r

t
n

b e a m :

p = 4 G e V p r

t
n

s 3 ´ 1

1 2

p r

t
n

s / p u l s e ( 3 ´ N A 4 8 / 2 ) D u t y f a c t

r

~ . 3 E x p e c t e d s i m i l a r t

4

. 8 s / 1 6 . 8 s d u t y c y c l e f

r

N A 4 8 / 2 S i m u l t a n e

u

s

p

e r a t i

n
f

L H C a n d fj x e d t a r g e t e x p e r i m e n t s

H i g h I n t e n s i t y , u n s e p a r a t e d s e c

n

d a r y b e a m :

Mo m e n t u m s e l e c t i

n

c h

s

e n t

p

t i m i s e K d e c a y s P = 7 5 G e V ( 1 . 4 ´ m

r

e K

+

t h a n N A 4 8 / 2 a t s a m e p r

t
n

b e a m i n t e n s i t y ) Dp / p ~ 1 % ( 3 ´ s m a l l e r t h a n N A 4 8 / 2 ) T

t

a l R a t e 7 5 MH z 5 2 5 MH z p 1 7 MH z p 4 5 MH z K

SLIDE 42

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 42

C E D A R / K T A G c h a r a c t e r i s t i c s :

D

i fg e r e n t i a l C h e r e n k

v

, 1 . 1 m

3

f

H y d r

g

e n @ 3 . 7 b a r a s r a d i a t

r
8

l i g h t b

x

e s w i t h 4 8 P MT s e a c h

K

a

n

T i m e r e s

l

u t i

n

< 1 p s

K

a

n

T a g g i n g e ffj c i e n c y > 9 5 %

P

i

n

Mi s

I

D p r

b

a b i l i t y < . 1 C E D A R / K T A G w

r

k i n g c

n

d i t i

n

s :

K

a

n

R a t e ( a v e r a g e ) ~ 4 5 MH z

R

a t e

n

s i n g l e P MT ~ 4 MH z

The NA62 experiment

B e a m T i m i n g a n d K a

n

I d e n t i fj c a t i

n

Gigatracker (750 MHz) Downstream detectors (~10 MHz) Must precisely match events

G i g a T r a c k e r : st < 2 p s / s t a t i

n

K T A G : st < 1 p s R I C H : st < 1 p s Mi s m a t c h p r

b

a b i l i t y < 1 % Wr

n

g m a t c h i n g → 3 ´ i n c r e a s e i n s( m

m i s s

)

SLIDE 43

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 43

T h e T r a c k i n g d e t e c t

r

s

G I G A T R A C K E R S : B e a m s p e c t r

m

e t e r f

r

K a

n

m

m

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

n

3 S i l i c

n

s e n s

r

s w i t h 3 ´3 mm

2

p i x e l s ( sp / p ~ . 2 % , sq = 1 6 mr a d )

The NA62 experiment

S T R A W C H A MB E R S : S p e c t r

m

e t e r f

r

p

s

i t i

n

a n d m

m

e n t u m m e a s u r e m e n t s

f

c h a r g e d d e c a y p r

d

u c t s , b a s e d

n

4 s t r a w c h a m b e r s , 2 . 1 m i n d i a m e t e r [ 1 6 l a y e r s ( 4 v i e w s )

f

s t r a w s p e r c h a m b e r ] MN P 3 3 d i p

l

e : . 3 6 T ( p

^

= 2 7 Me V ) s £ 1 3 mm ( 1 v i e w ) . 4 5 X p e r c h a m b e r sp / p = . 3 2 % Å . 8 % p sq( K p) = 2

5

mr a d

SLIDE 44

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 44

L A V : 1 2 c

u

n t e r s s u r r

u

n d i n g t h e v a c u u m t a n k p r

v

i d i n g f u l l c

v

e r a g e f

r

p h

t
n

s a t l a r g e a n g l e s L K r : E l e c t r

m

a g n e t i c c a l

r

i m e t e r b u i l t f

r

t h e N A 4 8 e x p e r i m e n t f

r

t h e p h

t
n

v e t

i

n t h e f

r

w a r d r e g i

n

I R C / S A C : P h

t
n

v e t

a

t s m a l l a n g l e s

T h e P h

t
n

V e t

S

y s t e m

The NA62 experiment

8.5 mrad £ q < 50 mrad 1 mrad £ q < 8.5 mrad

K+→p+p0 Photons:

81.2%: 2 in LKr/SAC 18.6%: 1 in LKr/SAC + 1 in LAV 0.2%: 1 in LAV + 1 lost (q>50mrad) Hermetic Photon Vetoes up to 50 mrad 0 mrad £ q < 1 mrad

SLIDE 45

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 45

T h e L K r c a l

r

i m e t e r

The NA62 experiment

Q u a s i

h
m
g

e n e

u

s i

n

i s a t i

n

c a l

r

i m e t e r R e a d

u

t t

w

e r s 2 ´2 c m

2

= 1 3 2 4 8 c h a n n e l s D e p t h 1 2 7 c m = 2 7 X P h

t
n

I n e ffj c i e n c y ( E

g >

1 G e V ) < 8 ´1

6

s E E = 3.2 %

√E(GeV )⊕

9% E(GeV )⊕0.42% s x , y= 4.2mm

√E(GeV )⊕0.6mm [

= 1 . 5 m m @ 1 G e V ]

SLIDE 46

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 46

T h e P i

n

I D d e t e c t

r

s

The NA62 experiment

MU V 1

2

: F e / s c i n t i l l a t

r

h a d r

n

c a l

r

i m e t e r U s e d

ffm

i n e t

r

e j e c t m u p t

1
5

l e v e l MU V 3 : F a s t m i d e n t i fj c a t i

n

f

r

t r i g g e r V e t

e

s m

n

l i n e @ 1 MH z w i t h st < 1 n s P r i m a r y p/nm s e p a r a t i

n

f r

m

d

w

n s t r e a m m u

n

v e t

e

s ( MU V ) R I C H : R i n g I m a g e C h e r e n k

v

d e t e c t

r

f

r

p/nm s e p a r a t i

n

a n d p i

n

c r

s

s i n g t i m e m e a s u r e m e n t A d d i t i

n

a l 1

2

m r e j e c t i

n

p r

v

i d e d b y R I C H

SLIDE 47

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 47 The NA62 experiment

F a s t c h a r g e d p a r t i c l e s s i g n a l f

r

t r i g g e r st ~ 3 p s ( a f t e r i m p a c t p

i

n t c

r

r e c t i

n

s u s i n g t r a c k e x t r a p

l

a t i

n

)

V e t

f
r

i n t e r a c t i

n

s i n G T K 3 6 s c i n t i l l a t

r

s t a t i

n

s h e r m e t i c b e t w e e n 1 . 3 1 a n d 4 9 m r a d

CHOD CHANTI

T h e H

d
s

c

p

e s ( C H O D s ) a n d t h e C H A N T I

New CHOD 2 p l a n e s ( h

r

i z

n

t a l + v e r t i c a l )

f

6 4 p l a s t i c s c i n t i l l a t

r

s t r i p s e a c h 1 p l a n e

f

1 5 2 s c i n t i l l a t

r

t i l e s

SLIDE 48

Karim Massri – Particle physics seminar – Birmingham 12/02/2020 48

T r i g g e r a n d D a t a A q u i s i t i

n

( T D A Q ) s y s t e m

L : H a r d w a r e s y n c h r

n
u

s l e v e l . 1 MH z t

1

MH z . Ma x l a t e n c y 1 m s . L 1 : S

f

t w a r e l e v e l . “ S i n g l e d e t e c t

r

” . 1 MH z t

1

k H z . Ma x l a t e n c y O ( 1 s ) . L 2 : S

f

t w a r e l e v e l . “ C

m

p l e t e i n f

r

m a t i

n

” . 1 k H z t

1

k H z . Ma x l a t e n c y O ( 3 s ) .

The NA62 experiment

1 6 s u b

d

e t e c t

r