ソフトプローブ(理論)村瀬功一 (京大基研)

ポストQM2023、名古屋大学KMI、2023/11/4
2023/11/4

1

今回: 動的模型

PartX (1/1)

全体まとめは QM Plenary Talk by 金久保さん 参照“Collective Dynamics - Theoretical Overview”＝ シミュレーションの枠組み＝ 測定量(ハドロン終状態)とダイナミクスの接続＝ 衝突反応の物理的理解の「形」
初期状態の模型
TRENTo, IP-Glasma, Glauber, CGC, AMPT, etc.

Pre-equilibrium dynamics
Free streaming, KøMPøST, EKT, KTIso, 2PI formalism, etc.

相対論的流体粘性流体、(カイラル・抵抗)磁気流体、異方粘性流体、ゆらぐ流体、etc.

ハドロン微視的輸送模型
SMASH, UrQMD, JAM
2023/11/4

2

PartX (1/1)

Lipei Du (Collective I)“Probing initial baryon stopping and EOS
with v1(y) of identified particles”
バリオン密度の初期条件
proton dN/dy & v1 を合わせる為にはPlateau 成分が必要

2023/11/4

有限密度EOSPID v1 を使って制限?

Solid: NEOS-B, Dashed: NEOS-BQS(EOS by Monnai et al)3PartX (1/1)

Grégoire Pihan (Collective II)“What carries the baryon number?
Simulations of baryon and electric charge stopping in isobar
collisions at RHIC”
Framework: iEBE-MUSIC
Baryon/Charge 初期条件

Isobar → baryon stopping λB vs charge stopping λQ

2023/11/4

4

PartX (1/1)

Grégoire Pihan (Collective II)“What carries the baryon number?
Simulations of baryon and electric charge stopping in isobar
collisions at RHIC”

2023/11/4

5

PartX (1/1)

Chun Shen (Finite T&μ I)“Bayesian Inference of QGP Properties
and 3D Dynamics of Heavy-Ion Collisions
in the RHIC Beam Energy Scan Program”
Rapidity 依存性も含めてベイズ解析を行う。
バリオン密度の初期条件は?

2023/11/4

6

PartX (1/1)

Chun Shen (Finite T&μ I)“Bayesian Inference of QGP Properties
and 3D Dynamics of Heavy-Ion Collisions
in the RHIC Beam Energy Scan Program”
iEBE-MUSIC / 3D 初期条件 (string deceleration)

Initial stopping

2023/11/4

Shear viscosity

Bulk viscosity

7

PartX (1/1)

Andi Mankolli (Collective I)“Rapidity-dependent Dynamics of the Initial
State via 3D Multi-system Bayesian Calibration”
Mid-rapidity だけの Bayes 解析(Bulk viscosity)

2023/11/4

Rapidity 依存性も考慮に入れた制限

8

PartX (1/1)

Jiangyong Jia (Initial State I)“Intersection between nuclear structureand heavy-ion collisions”

2023/11/4

9

PartX (1/1)

Jiangyong Jia (Initial State I)“Intersection between nuclear structureand heavy-ion collisions”
Ratio O(Ru+Ru)/O(Zr+Zr)

2023/11/4

arXiv:2206.10449

10

PartX (1/1)

Matthew Luzum (Initial State I)“Methods for systematic study of nuclear structure in highenergy collisions or: changing nuclei by shifting nucleons”
効率的な核子分布のサンプル方法を提案
Idea1: Step function 分布でサンプルした r1 と Gauss 分布でサンプルした r2 を足して核子の位置とする。

Idea2: ∇(球面調和関数) に沿って核子の位置を移流方程式で移動させることによって原子核変形を行う。
Idea3: 核子を反発させて位置を修正することによって short-range correlationを導入する。
2023/11/4

11PartX (1/1)

Matthew Luzum (Initial State I)“Methods for systematic study of nuclear structure in highenergy collisions or: changing nuclei by shifting nucleons”
Short-range correlation 排除半径に基づくもの vs 現実的なもの(Alvioli)

εn{2} で比較同時に合わせることはできない。

2023/11/4

12

PartX (1/1)

Wenbin Zhao (Initial State II)“Multi-scale Imaging of Nuclear Geometries”
Ultra-peripheral collisions (UPC)

2023/11/4

13

PartX (1/1)

Wenbin Zhao (Initial State II)“Multi-scale Imaging of Nuclear Geometries”

2023/11/4

14

PartX (1/1)

Wenbin Zhao (Initial State II)“Multi-scale Imaging of Nuclear Geometries”

2023/11/4

15

PartX (1/1)

Rupam Samanta (Collective II)“Thermalization of QGP through transverse momentum
fluctuation in ultra-central Pb+Pb collision”
arXiv:2306.09294[pt]-Nch scatter for fixed impact param b=0
Hydro

HIJING

弱い相関
強い相関→ Ultra-central の [pt] vs Nch を見れば描像の違いを見ることができる?
2023/11/4

Ultra-central ではb ゆらぎが抑制。
実験の knee はHydro の証拠?

16

PartX (1/1)

Mayank Singh (Collective I)“Quenching minijets in a concurrent
jet+hydro framework”
Minijet → Flow に影響: 粘性係数決定に影響(Bayes 解析に必要)
band: jet なし、点: jet あり

2023/11/4

17

PartX (1/1)

Chiho Nonaka (New Theory III)“Charge-dependent Anisotropic Flow in Relativistic
Resistive Magneto-hydrodynamic Expansion”
流体+電磁場のダイナミクス (オーム抵抗)2023/11/4

18

PartX (1/1)

Chiho Nonaka (New Theory III)“Charge-dependent Anisotropic Flow in Relativistic
Resistive Magneto-hydrodynamic Expansion”
Directed flow

2023/11/4

19

PartX (1/1)

Willian M. Serenone (Chirality I)“QGP vortex rings as a new probe for jet-induced
medium response and longitudinal dynamics”
arXiv:2305.02428

2023/11/4

PΛ: Λ polarization vector, p: momentum

20

PartX (1/1)

Willian M. Serenone (Chirality I)“QGP vortex rings as a new probe for jet-induced
medium response and longitudinal dynamics”
様々な位置・角度でジェットを置き流体計算 → RΛ を計算

内向きの方が大きく出る
2023/11/4

21

PartX (1/1)

Willian M. Serenone (Chirality I)“QGP vortex rings as a new probe for jet-induced
medium response and longitudinal dynamics”
イベント平均 & 方位角 φ 平均

内向きの方が大きく出る
2023/11/4

22

PartX (1/1)

Zhong Yang (Jets IV)“Jet-flow coupling in heavy-ion collisions andthe jet-induced diffusion wake”

2023/11/4

23

PartX (1/1)

Zhong Yang (Jets IV)“Jet-flow coupling in heavy-ion collisions andthe jet-induced diffusion wake”

2023/11/4

24

PartX (1/1)

Zhong Yang (Jets IV)“Jet-flow coupling in heavy-ion collisions andthe jet-induced diffusion wake”
これまでは diffusion wake の Δφ 依存性を見ていたが Δη 依存性も見る

2023/11/4

25

まとめ: 今後の動的模型の発展の方向

PartX (1/1)• 原子核変形・核子分布 (分野横断的方向性)
 方位角異方性、UPC、UCC、…
• Baryon-charge-strangeness currents(EOS、初期条件、輸送係数)• Mini-jets、jet-induced medium response、…
• ベイズ解析: 個別物理のパラメータ決定にも(初期条件、mini-jets、VAH、…)• 軽原子核・ハイパー核の生成過程(CP signal, hadron spectroscopy & femtoscopy)• 臨界・一次相転移のダイナミクス
2023/11/426

OTHERS

2023/11/427

PartX (1/1)

Nick Abboud (Chirality I)“A new causal and stable theory ofviscous chiral hydrodynamics”

arXiv:2308.02928

因果律・安定性・etc で問題のある項はフレームの取り直しで消去できる
2023/11/4

28

PartX (1/1)

Piotr Bozek (Sep 5 Collective I)“Can we observe effects of the early
nonequilirium dynamics in the collective flow”
Method: 2+1D Kinetic theory (cylindrical sym)
Equlibration rate

Directed flow

Directed flow probes equlibration rate
2023/11/429

PartX (1/1)

Maneesha Pradeep (Sep 5 CP I)“Critical expectations : NonGaussian cumulants of Particle
multiplicity near the critical point”
手法: Hydro+
4pt correlation

3pt correlation

2023/11/430

PartX (1/1)

Wei-jie Fu (Sep 5 CP I)“Baryon number fluctuations
at high baryon density”
手法: First-principles QCD within fRG

2023/11/431