quarkonia & exoticaproton.yonsei.ac.kr/pt_files/2020/pc_20201016 v2.pdfquarkonia & exotica...
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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
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
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
Spectraofcquark(J/psi)
https://www.hepdata.net/record/ins1512296
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
Spectraofcquark(J/psi)
https://www.hepdata.net/record/ins1644903
1712.08959
J/psi RPbPb, |y|<2.4 @ 5.02 TeV
7
Spectraofcquark(J/psi)
https://www.hepdata.net/record/ins1644903
Centrality dependence of RAA
J/psi RPbPb, |y|<2.4 @ 5.02 TeV
8
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
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
ψPrompt J/(2S)ψPrompt
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
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
1.41.6 < |y| < 2.4Cent. 0-100%
(5.02 TeV)-1, pp 28.0 pb-1bµPbPb 368
CMS
ψPrompt J/(2S)ψPrompt
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
https://www.hepdata.net/record/ins944755
1111.1557 [hep-ex]
J/psi, |y|<2.4 @ 7 TeV J/psi, 2.5<|y|<4 @ 5 TeV
https://www.hepdata.net/record/ins1472319
10
SpectraofcquarkviaDmeson
https://www.hepdata.net/record/ins1716440
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−