Measurement of Jet Modification at RHIC/STAR

Slides:



Advertisements
Similar presentations
Pulsar Workshop , NAOC1. Timing irregularities Timing noise: random fluctuation in pulse frequency with δν/ν < Glitch: pulse frequency.
Advertisements

Ch7 人口成長與一胎化家庭 國經所 袁國軒 潘鵬升.
2011年度汇报 科技部973项目 《日地空间天气预报的物理基础与模式研究》 第六课题组:空间天气预报方法和技术的应用与集成研究
Study of the AMS-02 results
A Force from Empty Space The Casimir Effect
二維品質模式與麻醉前訪視滿意度 中文摘要 麻醉前訪視,是麻醉醫護人員對病患提供麻醉相關資訊與服務,並建立良好醫病關係的第一次接觸。本研究目的是以Kano‘s 二維品質模式,設計病患滿意度問卷,探討麻醉前訪視內容與病患滿意度之關係,以期分析關鍵品質要素為何,作為提高病患對醫療滿意度之參考。 本研究於台灣北部某醫學中心,通過該院人體試驗委員會審查後進行。對象為婦科排程手術住院病患,其中實驗組共107位病患,在麻醉醫師訪視之前,安排先觀看麻醉流程衛教影片;另外對照組111位病患,則未提供衛教影片。問卷於麻醉醫師
Chapter 8 Liner Regression and Correlation 第八章 直线回归和相关
綠色創意伙伴Green Creative Partner
方德清 马余刚 蔡翔舟 田文栋 王宏伟 陈金根 郭威
Homework 4 an innovative design process model TEAM 7
Unit 4 I used to be afraid of the dark.
2015年年终总结 郭宗宽
Platypus — Indoor Localization and Identification through Sensing Electric Potential Changes in Human Bodies.
Thinking of Instrumentation Survivability Under Severe Accident
Population proportion and sample proportion
广义相对论课堂5 引力红移/时间膨胀检验和推论
Entanglement purification and faithful qubit transmission
Continuous Probability Distributions
Properties of Continuous probability distributions
§5.6 Hole-Burning and The Lamb Dip in Doppler- Broadened Gas Laser
Sampling Theory and Some Important Sampling Distributions
Fundamentals of Physics 8/e 27 - Circuit Theory
Prelimiary results for the structure of neutron stars
A New State of Matter: Quark-Gluon Plasma
量子色动力学的凝聚态物理 王 群 中国科技大学/近代物理系
生物芯片技术 刘超 李世燕 谢宏林
Studies on Higgs with the Final Sates of WW and bb
Direct detection of WIMP
邻近宇宙线源对高能电子的贡献 毕效军 粒子天体中心,中科院高能所 山东大学国际交流中心,威海 2017/9/21-23.
Interval Estimation區間估計
Understanding masses of charm-strange states in Regge phenomenology
塑膠材料的種類 塑膠在模具內的流動模式 流動性質的影響 溫度性質的影響
多相流搅拌器 练习 7.
Wang Meijuan Liu Lianshou Wu Yuanfang IOPP, Huazhong Normal University
辐射带 1958年:探险者一号、探险者三号和苏联的卫星三号等科学卫星被发射后科学家出乎意料地发现了地球周围强烈的、被地磁场束缚的范艾伦辐射带(内辐射带)。 这个辐射带由能量在10至100MeV的质子组成,这些质子是由于宇宙线与地球大气上层撞击导致的中子衰变产生的,其中心在赤道离地球中心约1.5地球半径。
Xin-Nian wang and M. Gyulassy Physics Review D vol
Neutron Stars and Black Holes 中子星和黑洞
Measurement of the continuum Ruds, Ruds(c)+Ψ(3770) and Rhad values in the range from to GeV 张达华 (for BES Collaboration) Institute of High Energy.
Quark Polarization in Relativistic Heavy Ion Collisions
推动全球能源变革,以创造清洁、安全、繁荣的低碳未来。
统 计 学 (第三版) 2008 作者 贾俊平 统计学.
普通物理 General Physics 21 - Coulomb's Law
高性能计算与天文技术联合实验室 智能与计算学部 天津大学
宇宙磁场的起源 郭宗宽 2016两岸粒子物理及宇宙学研讨会
相關統計觀念復習 Review II.
Outline QGP强子化过程中 夸克组合机制普适性的研究 答辩人 姚 涛 导 师 谢去病教授 山东大学 2009年5月27日.
Design and Analysis of Experiments Final Report of Project
Combination of Heavy Quarks with Partons from Quark-Gluon Matter: a Scaling Probe 山东大学物理系 李世渊 • INTRODUCTION : measurement/probe of QGP , via.
Testing quantum Landauer Principle using
如果夸克的世界只是又一層更細微的翻版,那就沒有太大的意思。
中微子理论进展报告 周顺 (高能所理论室) 2014年11月21日, 北京.
Inter-band calibration for atmosphere
王伟 上海交通大学 2015 怀柔 强子物理与核物理前沿研讨会
彭光雄 G.X. Peng 1. Matching-invariant running 连续的跑动耦合常数 Resummation 重求和
第八章 結論章節.
Nucleon EM form factors in a quark-gluon core model
Efficient Query Relaxation for Complex Relationship Search on Graph Data 李舒馨
微观经济学(第三版) 高鸿业 LECTURE11 市场失灵和微观经济政策.
Mechanics Exercise Class Ⅱ
Q1: How do we determine the crystal structure?
Thanks 柳国丽 回顾一下 SM 的 EWSB: scalar Higgs field potential.
怎樣把同一評估 給與在不同班級的學生 How to administer the Same assessment to students from Different classes and groups.
X-ray sources X-rays have the proper wavelength (in the Ångström range, ~10-10 m) to be scattered by the electron cloud of an atom of comparable size (we.
簡單迴歸分析與相關分析 莊文忠 副教授 世新大學行政管理學系 計量分析一(莊文忠副教授) 2019/8/3.
Electromagnetic properties of light nuclei
Principle and application of optical information technology
第七章 振动和波.
Gaussian Process Ruohua Shi Meeting
BESIII MDC 模拟与调试 袁野 年粒子物理实验计算软件与技术研讨会 威海.
Presentation transcript:

Measurement of Jet Modification at RHIC/STAR – OUTLINE – motivation analysis results summary Fuqiang Wang Purdue University 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Physics motivation Quantum Chromodynamics predicts phase transition between hadrons and Quark-Gluon Plasma (a state of thermalized partons) at high energy density. phase diagram of matter T r/r0 5-10 ~200 MeV Quark-Gluon Plasma early universe Few msec after the Big Bang the entire Universe may be in a QGP state. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Lattice QCD prediction: Physics motivation The goal of RHIC is to create QGP – a state of deconfined, thermalized quarks and gluons Lattice QCD prediction: F. Karsch, Nucl. Phys. A698, 199c (2002) TC ~ 170  8 MeV eC ~ 0.5 GeV/fm3 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 To create the QGP T r/r0 5-10 ~200 MeV Quark-Gluon Plasma 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Heavy ion collisions QCD Vacuum (1) energy density? (2) thermalization? 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Bjorken energy density estimate Boost invariant hydrodynamics: Bjorken Estimate of Initial Energy Density t ~1 fm/c 30xr0 nucl-ex/0311017 PRL 87 (01) 52301 Cold nuclear matter: r0 ~ 0.16 GeV/fm3 Low bound: t likely is smaller at RHIC. ET drops with time. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

To probe energy density self-generated, penetrating probe: large pT hadrons, jets Gluon bremsstrahlung Jet quenching: X.-N. Wang et al. they are generated early (by hard-scatterings); they need time to escape the collision zone; during this time, a QGP (or whatever medium) is formed; they interact with the medium, losing energy, thus giving us information about the medium. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Inclusive high pT yield – suppressed Large pT hadrons are mainly from jets produced by initial hard-scattering. Small cross-sections, scale with number of binary collisions. If no nuclear effect, AA = binary-scaled pp; AA binary-scaled pp  nuclear effect. 130 GeV 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Initial state effect? Control experiment d+Au! Phys. Rev. Lett. 91, No. 7, August 15, 2003 ? Maybe initial state suppression? e.g. PDF different in Au and deuteron 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 High pT suppression suppression of high pT hadron yield suppression of back side angular correlation no suppression in d+Au  Final state interaction in Au+Au, consistent with energy loss by high pT particles – jet quenching. strong absorption 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Energy density inferred from models X.-N. Wang, PLB 579 (04) 299 pQCD calculations: x30 gluon density x100 energy density in central Au+Au collisions ~ Bjorken estimate 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

“Pre-hadronic” and hadronic rescattering Gallmeister, Greiner, Xu, PRC67, 44905 (2003) Cassing,Gallmeister, and Greiner, hep-ph/0311358 p Suppression factor <L/l> 1 r 2 3 tf Calculations use: 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 To measure energy loss possible… by going to low pT. S. Pal, S. Pratt, PLB574 (2003) 21. X.-N. Wang, PLB 579 (2004) 299, nucl-th/0307036. C.A. Salgado, U.A. Wiedemann, hep-ph/0310079. M. Gyulassy, I. Vitev, X.-N. Wang, B.-W. Zhang, nucl-th/0302077. …… Pal, Pratt, PLB 574 (2003) 21 How is energy distributed? amount of energy loss? contribution from medium? 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Reconstructing low pT associated particles Df (1/Ntrig) dN/d(Df) STAR Preliminary background Signal p+p Jet-like structures Au+Au top 5% Select a leading particle 4<pT<6 GeV/c, |h|<0.75. Associate other particles (0.15<pT<4 GeV/c,|h|<1.1) with the leading particle. Form Df,Dh correlations. Background from mix- events. v2 modulation on background. Normalize in 0.9<|Df|<1.3. Efficiency corrections are applied to associated particles. Take difference and normalize per trigger. High pT particle p+p High pT particle Au+Au 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Azimuth angular correlations High pT: 1/Ntrigger dN/d(Df) D f (radians) Low pT: M.G. Albrow et al. NPB145, 305 (1978) p+p, 53 GeV near side: |Df|<1.1, |Dh|<1.4 away side: |Df-p|<2, |h|<1.1 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 “Jet” sizes STAR Preliminary near: |Df|<1.1, |Dh|<1.4 away: |Df-p|<2, |h|<1.1 Au+Au top 5% bkgd subt. RMS (1/Ntrig) dN/d(Df) s Df near (1/Ntrig) dN/d(Dh) With increasing centrality: Near side broadens in h but not f. Away side modest increase in size. Dh 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Longitudinal broadening N.Armesto, C.A.Salgado, U.A.Wiedemann, hep-ph/0405301 long. flow S.A. Voloshin, nucl-th/0312065 p + p radial flow 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

“Jet” charge multiplicity and “energy” STAR Preliminary p+p With the same final leading particle, we are selecting a larger energy jet in central AA than in pp. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Medium contribution? Total scalar pT: Initial parton energy + medium contribution? TPC acceptance of away side partner? 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Jet quenching model X.-N. Wang, PLB 579 (2004) 299, nucl-th/0307036 with energy loss without energy loss DE = 1.4 – 2.2 GeV } Caution: cannot be readily compared to data yet 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Thermal-shower recombination Hwa, Yang, nucl-th/0401001 In this model, the thermal- shower recombination is the largest contribution to high pT particles. One mechanism for energy contribution from medium. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Thermalization? Thermalization in the final state: Final state low pT hadron distributions look thermal. Event-by-event <pT> variation is small: every event looks thermal. Hadron compositions described by thermal models. TChemical ~ 160 MeV ~ TC. Necessary but not sufficient condition for early thermalization. NA49, PRC 68 (2003) 34903 Early state thermalization? First time at RHIC elliptic flow at low pT described by hydro: zero mean free path  max. possible v2. SPS v2 lower than hydro, however energy density may be not much lower. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

To probe thermalization Put two sources of particles together: one from jet fragmentation that are initially hard. the other from bulk medium that are soft. and see how they become at end of the day. Leading hadrons Medium jet medium 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Associated particles pT distributions STAR Preliminary: Quark Matter 2004 Away side: energy from the initial parton is redistributed to low pT energy loss in medium! Near side: Overall enhancement from pp to AA larger initial parton energy (and modest energy loss) Away syst. error Near softening in spectra: partial equilibration with medium 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Partial approach toward thermalization STAR Preliminary: QM 2004 Leading hadrons Medium In central Au+Au, the balancing hadrons are greater in number, softer in pT, and distributed broadly in angle, relative to pp or peripheral Au+Au.  away-side products seem to approach equilibration with bulk medium traversed, making thermalization of the bulk itself quite plausible. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Summary high enough energy density? High pt suppressed. Models require x30 normal nuclear gluon density. Statistical reconstruction of “complete” jets. Same pT leading particles from larger energy jets in AA than pp. Potential for experimental measure of energy loss. parton thermalization? Broader angular distribution, larger multiplicity, softer pT. Partial thermalization with bulk medium. High degree of thermalization in medium itself plausible. Have we created a new form of matter? Definitely! It’s dense, strongly interacting, opaque. Is it a QGP? Xin-nian said yes. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Are leading particles from jets? PHENIX, PRL 91, 172301 (2003) p / p ~ 0.9 in central p / p ~ 0.3 in peripheral p+p @ ISR QM’04 non-frag. p / p ~ 0.6 non-frag. p / Nch ~ 0.3 pT=3-4 GeV/c: ~30% are probably from other sources. B. Alper, NPB 87 (1975) 41 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Coalescence / recombination models Fries et al, PRC 68 (03) 44902 Greco et al, PRC 68 (03) 34904 Hwa et al, nucl-th/0401001 Coalescence / recombination models predict a range of non-fragmentation contributions. All predict a rapid drop of non-fragmentation contribution above 4 GeV/c. pT>4 GeV/c: may mainly come from jets, or related to jets. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Coalescence / recombination models Fries et al, PRC 68 (03) 44902 Greco et al, PRC 68 (03) 34904 Hwa et al, nucl-th/0401001 Coalescence / recombination models predict a range of non-fragmentation contributions. All predict a rapid drop of non-fragmentation contribution above 4 GeV/c. 4<pT<6 GeV/c: may mainly come from jets, or related to jets, but transition region according to models. pT>6 GeV/c: a lot cleaner. Study two pT regions: 4<pT<6 GeV/c and pT>6 GeV/c 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

What we know from previous measurements… Suppression phenomena in central Au+Au are due to final-state interactions. Parton-parton hard-scatterings are initially present. RCP 10% 60-92% pT > 4 GeV/c region is mainly from jet fragmentation. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Baryon/meson 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Coalescence / recombination models 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Broadened distribution and thermalization e.g. a thermal fluctuated large pT particle (or a mono-jet) would produce an away side excess due to momentum conservation. Borghini et al. PRC 62, 034902 (2000):  HIJING all h STAR |h| < 0.5 p+p 0.23 0.26 Au+Au 5% 0.31 0.50 assoc. particle pT (GeV/c) cos strength per particle STAR, PRL90, 082302 (2003) (1/Ntrig) dN/d(Df) STAR Preliminary: Y. Guo poster P25 Df (1/Ntrig) dN/d(Df) Df STAR Preliminary p+p Au+Au 5% Fit to near side: const. + gaussian + Borghini-cos(fixed) stat. mom. conserv. Borghini et al. free fit trigger particle pT (GeV/c) cos strength per particle STAR, PRL90, 082302 (2003) (1/Ntrig) dN/d(Df) STAR Preliminary: Ying Guo poster Df STAR Preliminary p+p Au+Au 5% Fit to near side: const. + gaussian + Borghini-cos(fixed) stat. mom. conserv. Borghini et al. free fit the final state away excess has a similar shape to a stat. distr. from momentum conservation. near side is mostly a jet, and initially no mono-jet at mid-rapidity. No punch-through for 6 < pTtrig < 10 GeV/c. the away side excess is approaching equilibration with the medium, consistent with the pT spectra results. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Broadened distribution and thermalization (1/Ntrig) dN/d(Df) Df STAR Preliminary p+p Au+Au 5% Fit to near side: const. + gaussian + Borghini-cos(fixed) stat. mom. conserv. Borghini et al. free fit the away excess has a similar shape to a stat. distr. from momentum conservation. Borghini et al. PRC 62, 034902 (2000):  HIJING all h STAR |h| < 0.5 p+p 0.23 0.26 Au+Au 5% 0.31 0.50 Cannot distinguish: (1) the full event participates in momentum balance. (2) Only a handful particles: e.g. jet-jet production. the away side excess approaching equilibrium with the medium! 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Cos-coefficient vs centrality p+p 80-60% 60-40% 40-30% 30-20% 20-10% 10-5% 5-0% cos coeff. Nch 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 d+Au results d+Au data set has larger statistics than the p+p data set, allowing a study of jet spectra as a function of trigger pT. near away Hardening of spectra with increasing trigger pT. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Raito of d+Au spectra 6<pT<10 GeV/c 4<pT<6 GeV/c Associated pT (GeV/c) d+Au spectra ratio Associated pT (GeV/c) Au+Au / p+p If initial parton energy was larger in AA than pp, then a hardening of spectra is expected. No hardening is observed in AA; may indicate contribution of soft hadrons from energy loss. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 d+Au yield and total pT p+p trigger pT near mult. away mult. p+p trigger pT near sum pT away sum pT Consistency between p+p and d+Au results. d+Au no much different from p+p. Increase of associated multiplicity and sum pT with increasing trigger pT. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 d+Au yield and total pT 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

d+Au vector pT away/near ratio 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

d+Au vector pT away/near ratio 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 “z” distributions Backup Slides 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 z distributions 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 ---New results--- 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Azimuth angular correlations High pT: Low pT: M.G. Albrow et al. NPB145, 305 (1978) p+p, 53 GeV near side: |Df|<1.0, |Dh|<1.4 away side: |Df-p|<2.15, |h|<1.0 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

“Jet” charge multiplicity and “energy” STAR Preliminary p+p With the same final leading particle, we are selecting a larger energy jet in central AA than in pp. 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Higher pT trigger 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Medium contribution? Total scalar pT: Initial parton energy + medium contribution? TPC acceptance of away side partner? 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Away side <pT> away side associated particle <pT> decreases with centrality, approaching medium hadron <pT> in central collisions equilibration between the two sources of particles 4<pT<6 GeV/c 6<pT<10 GeV/c 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Compare to pp, pA pT (GeV/c) dN/dpT2 [a.u.] PRELIMINARY p+p STAR Preliminary p+p pT (GeV/c) <ztrigger> G. Boca et al. ZPC49, 543 (1991) p+A 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Compare to pp, pA pT (GeV/c) dN/dpT2 [a.u.] PRELIMINARY p+p STAR Preliminary p+p pT (GeV/c) <ztrigger> G. Boca et al. ZPC49, 543 (1991) p+A 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Df distribution 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Dh distributions 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Near side distributions 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 AA/pp vs IAA Peripheral: AA/pp=1.01 IAA=0.84 - broadening in h - pp reference - v2 - model difference Central: AA/pp=1.66 IAA=1.25 Df Df 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 IAA < 1 in peripheral ? STAR Preliminary pp reference 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Hijing (no quenching) 4 < pTtrig < 6 GeV/c 2 < pT < 4 GeV/c 0.15 < pT < 4 GeV/c Df Df 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

Like-sign and unlike-sign STAR Preliminary 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

相对论重离子碰撞与低能强子物理讨论会, 威海 Unlike vs like (top 10%) Unlike-sign Like-sign Back-to-back paper |Dh|<0.5 |Dh|>0.5 1.2 |Dh|<0.5 + |Dh|>0.5 1.0 0.2-0.3 (Unlike-like)/unlike = 0.1 1-1.5 |Dh|<0.5 - |Dh|>0.5 Df 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019

pp (left) AuAu top 5% (right) Unlike-sign Like-sign Unlike-sign Like-sign 0.15 0.7 |Dh|<0.5 -0.03 0.5 0.15 0.7 |Dh|>0.5 -0.03 0.5 0.15 |Dh|<0.5 + |Dh|>0.5 1.3 -0.03 1.0 |Dh|<0.5 - |Dh|>0.5 0.15 0.1 -0.03 -0.05 Df Df 相对论重离子碰撞与低能强子物理讨论会, 威海 4/7/2019