Current research activities on heavy-ion physics in Korea: hot and - - PowerPoint PPT Presentation

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Current research activities on heavy-ion physics in Korea: hot and - - PowerPoint PPT Presentation

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Current research activities on heavy-ion physics in Korea: hot and rare Byungsik Hong (Korea University) THE 31 st ASRC International Workshop International Workshop on Hadron Physics JAEA, Tokai, Japan, January 18-20, 2016 Byungsik Hong

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SLIDE 1

Current research activities

  • n heavy-ion physics in

Korea: hot and rare

Byungsik Hong (Korea University)

THE 31st ASRC International Workshop “International Workshop on Hadron Physics” JAEA, Tokai, Japan, January 18-20, 2016

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

1

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SLIDE 2

Introduction to Korean HI Community

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

2

Subject Accelerator Experiment Participating institutes (# of faculties) Hot QGP LHC ALICE Inha (2), Pusan (1), Sejong (2), Yonsei (2) CMS Chonnam (1), Korea (1) RHIC PHENIX Chonbuk (1), Ewha (1), Hanyang (1), Korea (1), Myongji (1), Seoul (1), Yonsei (2) STAR Pusan (1) Dense Matter FAIR CBM Pusan (1) RIB (EoS, Esym) RIBF SAMURAI TPC IBS (1), Korea (1) RAON LAMPS Chonbuk (1), Chonnam (1), IBS (1), Inha (1), Korea (2)

  • Small community: ≲16 experimental faculties
  • Similar number of theoretical faculties
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SLIDE 3

Major Experimental Contributions∗

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

3

Experiment Contributions Leading institutes ALICE

  • ITS upgrade
  • Heavy-flavor production

Inha, Pusan, Yonsei Inha CMS

  • Forward RPC production
  • Quarkonium & HF productions in pA & AA

Korea Korea PHENIX

  • Forward RPC production
  • MPC-Ex Si sensor production
  • Quarkonium production in pp, pA & AA
  • Single muon production in pp, pA & AA
  • Spin structure of protons

Korea Yonsei Korea Yonsei Seoul, Korea SAMURAI TPC • Tracking software development Korea LAMPS

  • TPC development
  • Neutron wall development

IBS, Korea Korea

  • Hardware: Si sensors, Gas detectors (RPC & TPC), Neutron detectors
  • Analysis: Muons, Quarkonia, Heavy flavors

* Disclaimer: The list is not complete and may be a biased view.

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SLIDE 4

Nuclear Phase Diagram

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

4

𝑎/𝑂

1

Supernova IIa Neutron stars Quark-hadron Mixed phase

with RIB

Liquid-gas coexistence

Two examples: Quarkonium @ CMS and LAMPS @ RAON

Hot Rare

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SLIDE 5

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

5

  • I. Quarkonium Analysis

in CMS

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SLIDE 6

Quarkonium Production

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

6

  • 1. pp
  • Reference to understand pA and AA data
  • Production mechanism not well understood

– Color Octet vs. Color Singlet

  • Polarization for interaction of quarkonia

with surroundings, not affected by initial- state effect

  • 2. pA
  • Nuclear modification of gluon PDF (nPDF):

shadowing, saturation, CGC, etc.

  • Medium-induced coherent gluon radiation
  • Co-mover absorption
  • 3. AA
  • Color-charge screening effect: 𝜇𝐸 vs. 𝑠

– Sequential suppression: Different states dissociate at different temperatures

  • Regeneration of 𝑟 and ത

𝑟

– Expected to be larger for 𝐾/𝜔 than for Υ

  • A. Mocsy et al.,

PRD 77, 014501 (2008)

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SLIDE 7

CMS Detector

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

7

CALORIMETERS ECAL

76k scintillating PbWO4 crystals

HCAL

Plastic scintillator/ Brass sandwich

Steel YOKE

Pixels (66M Ch.) Silicon Microstrips (9.6M Ch.) 220 m2 of silicon sensors

TRACKER

Cathode Strip Chambers Resistive Plate Chambers

MUON ENDCAPS

Weight: 12,500 tons Diameter: 15 m Length: 22 m

HF

MB trigger Centrality in HI

BSC

MB trigger

MUON BARREL

Drift Tube Chambers Resistive Plate Chambers

HF(EM +HAD) HF(EM +HAD)

Superconducting Coil (3.8 T)

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SLIDE 8

Muons in CMS

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

8

  • Excellent ID and triggering capabilities in the muon system
  • Excellent momentum resolution in tracker (overall ~1-2%)
  • Global muons = Standalone muons x Tracker information
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SLIDE 9

𝜈−𝜈+ Invariant Mass in 2011

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

9

)

2

(GeV/c

m m

m

1 10

2

10

)

2

Events/(GeV/c

1 10

2

10

3

10

4

10

CMS Preliminary

  • 1

b m (PbPb) = 147

int

L

= 2.76 TeV

NN

s PbPb

w , r f y J/ (2S) y (1,2,3S) ¡ Z

> 4 GeV/c

m T

p

pT

mm > 6.5 GeV/c for |h| < 1.6

pT

mm > 3 GeV/c for 1.6 < |h| < 2.4

𝜍, 𝜕, 𝜚

𝐾/𝜔 𝜔(2𝑇)

Υ(1,2,3𝑇) 𝑎 𝑛𝜈𝜈 GeV/c2

𝑀𝑗𝑜𝑢 PbPb = 147 𝜈b−1

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SLIDE 10

𝐾/𝜔 Analysis Method

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

10

  • Simultaneous fit

– 𝜈−𝜈+ invariant mass – Pseudo-proper decay length

Inclusive 𝑲/𝝎 Prompt 𝑲/𝝎 Non-prompt 𝑲/𝝎 from 𝑪 decays Direct 𝑲/𝝎 Feed-down from y′ and cc JHEP 05, 063 (2012)

𝝉𝒏= 34 MeV comparable to pp

𝑚𝐾/𝜔 = 𝑀𝑦𝑧 𝑛𝐾/𝜔 𝑞𝑈

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SLIDE 11

𝐾/𝜔 in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

11 CMS-PAS-HIN-12-014

Prompt Nonprompt 𝑂𝑞𝑏𝑠𝑢 𝑞𝑈 𝑧

from B decays

𝑆𝐵𝐵 𝑞𝑈 = 𝑒2𝑂

𝐵𝐵/𝑒𝑞𝑈𝑒𝜃

< 𝑈

𝐵𝐵> 𝑒2𝜏𝑂𝑂/𝑒𝑞𝑈𝑒𝜃

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SLIDE 12

𝐾/𝜔 in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

12

  • Yield is larger at lower 𝑞𝑈 and

midrapidity in central PbPb

  • Consistent with regeneration

scenario

  • Compare to ALICE D mesons

𝑆𝐵𝐵 𝐶 > 𝑆𝐵𝐵(𝐸) > 𝑆𝐵𝐵(ℎ±)

  • Consistent with mass ordering

− Dead cone effect?

𝐶 → 𝐾/𝜔 𝐸0 Charged hadrons

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SLIDE 13

𝑤2 of Prompt 𝐾/𝜔 in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

13

  • Finite 𝑤2 for prompt 𝐾/𝜔 in the measured 𝑞𝑈 range
  • Low 𝑞𝑈 (< 8 GeV/c): 𝑤2 for prompt 𝐾/𝜔 < 𝑤2 for ℎ± or prompt 𝐸
  • High 𝑞𝑈 (> 8 GeV/c): 𝑤2 for prompt 𝐾/𝜔 ≈ 𝑤2 for ℎ±

CMS-PAS-HIN-12-001

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SLIDE 14

𝜔(2𝑇) in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

14

  • Indication of y(2S) being less suppressed

than J/y (<2s effect) at low 𝑞𝑈 in the most central events: Need more 𝐾/𝜔 statistics from Run II.

For 3 < 𝑞𝑈 <30 GeV/c in 1.6 < 𝑧 < 2.4 𝑆𝜔(2𝑇) in central (20%) PbPb is ∼ 5 times larger than that in pp with larger systematic error. For 6.5<𝑞𝑈<30 GeV/c in 𝑧 < 1.6 𝑆𝜔(2𝑇) in central (20%) PbPb is ∼2 times smaller than that in pp.

ALICE, arXiv:1506.08804 CMS, PRL 113, 262301 (2014)

𝜔 2𝑇 𝐾/𝜔

𝑄𝑐𝑄𝑐

/ 𝜔 2𝑇 𝐾/𝜔

𝑞𝑞

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SLIDE 15

𝛷(𝑜𝑇) in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

15

↑ Centrality integrated (0-100%) results: 𝛷 states suppressed sequentially 𝑆𝐵𝐵 Υ(1S) = 0.425 ± 0.029 ± 0.070 𝑆𝐵𝐵 Υ(2S) = 0.116 ± 0.028 ± 0.022 𝑆𝐵𝐵 Υ(3S) < 0.14 at 95% CL ↗ Anisotropic hydrodynamic model for thermal suppression of bottomonia – 2 temperatures along 𝑧, 3 shear viscosities, no CNM, no regeneration, … ↗ Transport model taking into account CNM and regeneration CMS-PAS-HIN-15-001

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SLIDE 16

𝛷(𝑜𝑇) in PbPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

16

← 𝛷 suppression does not strongly depend on kinematics. ↑ Anisotropic hydro model cannot reproduce the forward data: CNM may help? CMS-PAS-HIN-15-001

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SLIDE 17

𝐶 production in pPb

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

17

CMS-PAS-HIN-14-004, arXiv:1508.06678, Submitted to PRL

  • 𝐶 analysis in pPb

– No modification for 𝐶±, 𝐶0, 𝐶𝑇

0 within uncertainties

– Baseline for PbPb

  • CMS capability to reconstruct 𝐶 in PbPb

– First fully reconstructed 𝐶 in PbPb environment – Expect interesting physics results from RUN II PbPb with higher statistics CMS detector performance plot (2011 PbPb data at 2.76 TeV)

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SLIDE 18

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

18

  • III. Detector Development

for LAMPS @ RAON

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SLIDE 19

RAON: New RIB Accelerator in Korea

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

19

  • Radioactive-ion beams by ISOL & IF

‒ ISOL: Direct fission of 238U by protons @ 70 MeV ‒ IF: Fragmentation by 8.3 pmA 238U @ 200 MeV/c

  • High-intensity neutron-rich RI beams

‒ E.g., 132Sn beams up to 250 AMeV with 108 pps

  • More exotic RI beams by combining ISOL & IF
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SLIDE 20

LAMPS

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

20

Large-Acceptance Multi-Purpose Spectrometer =

Solenoid Spectrometer ⊕ Dipole Spectrometer ⊕ Neutron Array

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SLIDE 21

EoS and Symmetry Energy

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

21

𝐹 𝜍, 𝜀 /𝐵 = 𝐹 𝜍, 𝜀 = 0 + 𝐹𝑡𝑧𝑛 𝜍 𝜀2 + 𝒫 𝜀4 + ⋯ with 𝜍 = 𝜍𝑜 + 𝜍𝑞 and 𝜀 = Τ (𝜍𝑜 − 𝜍𝑞) (𝜍𝑜 + 𝜍𝑞)

  • Useful expansion of 𝐹𝑡𝑧𝑛 𝜍 around 𝜍0

𝐹𝑡𝑧𝑛 𝜍 = 𝐾 +

𝑀 3 𝜍−𝜍0 𝜍0

+

𝐿𝑡𝑧𝑛 18 𝜍−𝜍0 𝜍0 2

𝑀 =

3 𝜍0 𝑄 𝑡𝑧𝑛 = 3𝜍0

ቚ

𝜖𝐹𝑡𝑧𝑛 𝜍 𝜖𝜍 𝜍=𝜍0

(slope) 𝐿𝑡𝑧𝑛 = 9𝜍02 ฬ

𝜖2 𝐹𝑡𝑧𝑛 𝜍 𝜖𝜍2 𝜍=𝜍0

(curvature)

  • Primary physics goal of LAMPS is

‒ To explore the nuclear symmetry energy (𝐾, 𝑀, 𝐿𝑡𝑧𝑛) from sub-saturation to supra-saturation densities.

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SLIDE 22

Time Projection Chamber

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

22

  • Simulation of triple GEM by GARFIELD++

− Gas mixture: Ar 90% + CH4 10% − Voltage for each foil ∼400 V − <Gain> ∼ 1.4Χ106 − <Drift velocity> ∼ 50 mm/ms − <Dispersion> ≲ 3 mm

Central Au+Au at 250 AMeV

IQMD

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SLIDE 23

TPC Simulation

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

23

Central Au+Au at 250 AMeV Track Recon=Riemann Tracking+GENFIT

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SLIDE 24

Design of Prototype TPC

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

24

2013-12-17 진도관리 중간평가 (LAMPS) 24

Inner field cage Outer field cage Cathode plane Triple GEM Pad 150 mm 490 mm

Half-size prototype TPC

Bottom Al frame for Pad & GEM

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SLIDE 25

Assembly of Prototype TPC

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

25

Inner Field Cage installed Outer Field Cage installed Prototype TPC assembled Prototype TPC: back

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SLIDE 26

Test of Triple GEM Readout

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

26

Signal from Fe-55 source

AsAd

  • A. Buzulutskov et al.,

NIMA443, 164 (2000) 5.89 keV X-ray

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SLIDE 27

Neutron Detector Array

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

27 60Co 252Cf

  • Construction of real-size prototype

detectors (0.1Χ0.1X2.0 m3)

  • Performance was tested using 60Co

and 252Cf sources

  • Plan to have a beam test this year

veto

𝑦 𝑧 𝑨 𝑧

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SLIDE 28

LAMPS Neutron Array

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

28 252Cf

g n

  • Watt spectrum:

Τ

𝑒𝑂 𝑒𝐹 ∝ 𝑓−𝑏𝐹 sinh

𝑐𝐹 – 𝑏=0.88 MeV-1 and 𝑐=2.0 MeV-1 – B. Watt, Physical Review 87, 1037 (1952)

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SLIDE 29

Summary

  • 1. Korean nuclear physics community is
  • Small, but active.
  • Participating in various experiments at LHC, RHIC, FAIR,

RIBF, and RAON.

  • 2. Examples
  • Heavy-ion physics at CMS

– Major responsibility to the construction of forward RPC system – Quarkonium production in pA and AA collisions

  • RIB physics at LAMPS/RAON

– Development of TPC: simulations, tracking software, construction and test of prototype – Development of neutron array: simulation, analysis software, construction and test of prototype

  • 3. Final message
  • The Korean HI community is still in the developing stage.

We expect a lot more to come.

Byungsik Hong

  • Int. Workshop on Hadron Physics @ JAEA

29