CERN-07 SHLee

1

Heavy Exotic Particle Production from HIC at LHC

Su Houng Lee Yonsei Univ., Korea

with

Shigehiro Yasui, Wei Liu , Che-Ming Ko

CERN-07 SHLee

2

Scalar tetraquark (Jaffe 76) Recently observed heavy tetraquark?

Search for H dibaryon Search for + pentaquark

Not explicitly exotic

Never found nor confirmed ?

CERN-07 SHLee

3

All Constituent quark model + … suggestAll Constituent quark model + … suggest

1. Exotic (meson or bayon with anomalous quark number) will exist in QCD due to quark quark attraction

2. Exotics with heavy quarks will surely exist

CERN-07 SHLee

4

aq

aq

aq

bq

abc

Attractions in quark-antiquark vs. diquark

One gluon exchanger

1

3

4

r

1

3

4

2

1

Lattice calculationr r2

1

kiki

SSmm

C

3

1 kiki

SSmm

C Phenomenological fit of

color spin interaction

to hadron spectrum

CERN-07 SHLee

5

Works very well with 3x CB = CM = 635 mu2

u u d

kiki

B ssmm

C

MeV 4700 MeV, 1500 MeV, 500 MeV, 300 bcsdu mmmmm

Baryon Mass difference

Meson Mass difference

d u

kiki

M ssmm

C

CERN-07 SHLee

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Why there should be a heavy pentaquark

For a Pentaquark

su

d su

For a Nucleon and a Kaon

su

ds u

4

3

4

3 MeV 232

2su

B

u

B

mm

C

m

C

4

3

4

3 MeV 430

2su

M

u

B

mm

C

m

C

c

For a charmed Pentaquark

= -232 MeV

For a Nucleon and a D-meson

c

= -240 MeV xmc

CERN-07 SHLee

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Tetraquark : 1+

For a Tetraquark

su

d s

For the K and K* meson

su d

4

4

3 MeV 127

22s

B

u

B

m

C

m

C

4

4

3 MeV 193

su

M

su

M

mm

C

mm

C

s

c

For doubly charmed tetraquark

= -143 MeV

c

xmc2

cc

For the D and D* meson

= -64 MeV xmc xmc

CERN-07 SHLee

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Spin 1 Etetraquark- E2meson

ud ss 63 MeV

ud cc -79 MeV

ud bb -124 MeV

Spin 0 Etetraquark- E2meson

ud sc 218 MeV

ud sb 165 MeV

ud cb -21 MeV

Parity + EPentaquark- Emeson+baryon

ud ud s 141+EL=1 MeV

ud ud c -50 + EL=1 MeV

ud ud b -114+ EL=1 MeV

Parity - EPentaquark- Emeson+bayron

ud us c 198 MeV

ud us c 8 MeV

ud ud b -56 MeV

Tetraquarks

Pentaquarks

CERN-07 SHLee

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Search for cs =(ud)(us) c pentaquark

Previous search Fermilab (E791)

cs

K*

K

P

Fermilab bound

02.0

s

cs

DN

N

LHC (ALICE ) measure D0 well

cs

D0

K

Statistical model

01.0

s

cs

DN

N

CERN-07 SHLee

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Search for Tcc =(ud)(cc) tetraquark

No previous experiment was possible

But will be possible at LHC (ALICE ): 100 cc pairs produced

Tcc D*

K

CERN-07 SHLee

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Number produced at LHC from coalescenceNumber produced at LHC from coalescence

1. Tcc : RHIC=1x10-4 LHC=0.07

2. cs : RHIC=1.3x10-4 LHC=5x10-3

3. LHC can be a very useful heavy exotic factory

If found, it will be the first exotic ever,

will tell us about QCD, q-q interaction and dense matter

great step forward in QCD

CERN-07 SHLee

12

Why there should be a heavy pentaquark

For a Pentaquark

su

d du

For a Nucleon and a Kaon

su

dd u

MeV 290 4

3

4

322

u

B

u

B

m

C

m

C

MeV 430 4

3

4

32

su

M

u

B

mm

C

m

CMeV 240

4

3

4

32

cu

M

u

B

mm

C

m

C

For a Nucleon and a D-meson

cu

dd u

c

For a charmed Pentaquark

u

d du

MeV 290 4

3

4

322

u

B

u

B

m

C

m

C