Quarkonia & Exoticaproton.yonsei.ac.kr/pt_files/2020/Pc_20201016 v2.pdfQuarkonia & Exotica WHAN-KI...

Yongsun KimOct 16 2020Yonsei Univ.

Quarkonia & Exotica

WHAN-KI KIM (05-IV-71, UNIVERSE)

2

Into the future: new probes and detector upgrades

Prompt X (3872) ! J/ ⇡+⇡�

10 20 30 40 50 60 70T

p

2−10

1−10

1

10

210

R

Inclusive

PromptNonprompt

pp (7 TeV, CMS)|y| < 1.2

pp (8 TeV, ATLAS)|y| < 0.75Prompt

PbPb (5.02 TeV, CMS)|y| < 1.6, Cent. 0-90%

Preliminary CMS (2018 PbPb 5.02 TeV)-11.7 nb

Comparison to pp: use (2S) as reference

R = N(Corr)X (3872)/N

(Corr) (2S)

R(PbPb) = 1.10± 0.51(stat.)± 0.53(syst.)

Less suppression for X (3872) than (2S)?

E. Chapon (CERN) CMS highlights QM 2019 19 / 24

[517] Y-J Lee Wed 17:40CMS-PAS-HIN-19-005


Prompt X (3872) ! J/ ⇡+⇡�

10 20 30 40 50 60 70T

p

2−10

1−10

1

10

210

R

Inclusive

PromptNonprompt

pp (7 TeV, CMS)|y| < 1.2





R = N(Corr)X (3872)/N

(Corr) (2S)

R(PbPb) = 1.10± 0.51(stat.)± 0.53(syst.)




pp

• Big benefits from measuring the ratio • Non-prompt X(3872) from Bc decay• X(3872) produced from recombination in

QGP?• If then, how much?

X(3872)-Result

3

Possiblechannelsforquarkonia,pentaquarkandwhatever

• Hard scattering • pp and PbPb• Jet fragmentation• High pT ( > 10 GeV) • Energy loss • Subject for screening

• Recombination • c in med. + c-bar in med.

• Semi-combination • c in hard scattering + c-bar in med.

4

Spectraofcquark(J/psi)

https://www.hepdata.net/record/ins1512296

1702.01462

J/psi, |y|<2.4 @ 5.02 TeV

5



1702.01462

J/psi RpPb, |y|<2.4 @ 5.02 TeV

For pT > 6 GeV/c, RpPb is consistent with unity within 20% -> Majority is from hard scattering

6



1712.08959

J/psi RPbPb, |y|<2.4 @ 5.02 TeV

7



Centrality dependence of RAA

J/psi RPbPb, |y|<2.4 @ 5.02 TeV

8


Prompt X (3872) ! J/ ⇡+⇡�

10 20 30 40 50 60 70T

p

2−10

1−10

1

10

210

R

Inclusive

PromptNonprompt

pp (7 TeV, CMS)|y| < 1.2





R = N(Corr)X (3872)/N

(Corr) (2S)

R(PbPb) = 1.10± 0.51(stat.)± 0.53(syst.)




8. Conclusions 13

partN0 50 100 150 200 250 300 350 400

AAR

0

0.2

0.4

0.6

0.8

1

1.2

1.4 < 30 GeV/c

T6.5 < p|y| < 1.6

(5.02 TeV)-1, pp 28.0 pb-1bµPbPb 368 (<30%) / 464 (>30%)

CMS

ψPrompt J/(2S)ψPrompt

(GeV/c)T

p0 5 10 15 20 25 30

AAR

0

0.2

0.4

0.6

0.8

1

1.2

1.4|y| < 1.6Cent. 0-100%

(5.02 TeV)-1, pp 28.0 pb-1bµPbPb 368

CMS


partN0 50 100 150 200 250 300 350 400

AAR

0

0.2

0.4

0.6

0.8

1

1.2

1.4 < 30 GeV/c

T3 < p1.6 < |y| < 2.4

(5.02 TeV)-1, pp 28.0 pb-1bµPbPb 368 (<30%) / 464 (>30%)

CMS


(GeV/c)T

p0 5 10 15 20 25 30

AAR

0

0.2

0.4

0.6

0.8

1

1.2

1.41.6 < |y| < 2.4Cent. 0-100%

(5.02 TeV)-1, pp 28.0 pb-1bµPbPb 368

CMS


Figure 7: Nuclear modification factor of prompt J/y and y(2S) mesons as a function of Npart(left) and dimuon pT (right), at central (upper, starting at pT = 6.5 GeV/c) and forward (lower,starting at pT = 3.0 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals inthe bins where the double ratio measurement is consistent with 0 (see text). For the results asa function of Npart the most central bin corresponds to 0–10% (0–20%), and the most peripheralone to 50–100% (40–100%), for |y| < 1.6 (1.6 < |y| < 2.4). The bars (boxes) represent statistical(systematic) point-by-point uncertainties. The boxes plotted at RAA = 1 indicate the size of theglobal relative uncertainties.

Combined with previous results for the double ratio (Ny(2S)/NJ/y)PbPb/(Ny(2S)/NJ/y)pp, the392

current RAA values for J/y mesons are used to derive the prompt y(2S) meson RAA in PbPb393

collisions atp

sNN = 5.02 TeV, as a function of pT and collision centrality, in two different rapid-394

ity ranges. The results show that the y(2S) is more suppressed than the J/y meson for all the395

kinematical ranges studied. No pT dependence is observed within the current uncertainties.396

Hints of an increase in suppression with increasing collision centrality are also observed.397

Acknowledgments398

We congratulate our colleagues in the CERN accelerator departments for the excellent perfor-399

mance of the LHC and thank the technical and administrative staffs at CERN and at other400

’RAAis~0.15ψ

RAAofX(3872)= XPbPb

Xpp=

XPbPb

ψ′ PbPb

Xpp

ψ′ pp

×ψ′ PbPb

ψ′ pp∼ 1.5 ± 0.5

ComingbacktoX(3872)

9

Spectraofcquark(J/psi)at7TeVandforwardregion


1111.1557 [hep-ex]

J/psi, |y|<2.4 @ 7 TeV J/psi, 2.5<|y|<4 @ 5 TeV


10

SpectraofcquarkviaDmeson


1901.07979 [nucl-ex]

D meson @ 5 TeV

11

PcinpPb?

In CMS, J/psi background is under control for pT> 6 GeV, and X background for pT > 10 GeV -> Should consider the recombination by hard scattering

In LHCb, Pc was measured from

channel in pp

collision, which has nothing to do with recombination

Λ0 → J/ψpK−

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