Jet tomography of hot and cold nuclear matter Xin-Nian Wang - PowerPoint PPT Presentation

Theoretical Physics Colloquium (online) 2020.7.22 Jet tomography of hot and cold nuclear matter Xin-Nian Wang Central China Normal University 1 Lawrence Berkeley National Laboratory

QCD: Theory for strong interaction n l 1 f å å µ µ µ n = yg ¶ - - y - a L ( i gA m ) F F µ µ n QCD a a a , 2 4 = f 1 a • SU(3) gauge symmetry (non-Abelian) • Asymptotic freedom at short distance α s ( Q 2 ) = 4 π / (11 − 2 n f / 3) • Confinement at long distance ln( Q 2 / Λ 2 QCD ) • Chiral symmetry and its spontaneous breaking h ¯ ψψ i 6 = 0 • Goldstone boson and chiral condensate • Scale and U A (1) anomaly h F µ ν F µ ν i 6 = 0 • ….

Phase structure of QCD Matter 3

EOS from lattice QCD 7 ⇡ 2 120 + 16 ⇡ 2  � T 4 ✏ SB = 6 n f 30 16 (HotQCD-Bielefeld-BNL-CCNU) non-int. limit PRD90(2014)094503 12 HRG T c 8 3p/T 4 � /T 4 3s/4T 3 4 T [MeV] 0 130 170 210 250 290 330 370 At T ~ 5T c , e still 80% of the Stefan-Boltzmann value: quasi-particle modes at high T 4

QGP in heavy-ion collisions High T, µ confinement De-confinement nucleus quark-gluon plasma (QGP) RHIC LHC 5

Properties of QGP in A+A Collisions Dynamic System : § EM emission: Medium response to EM interaction g production, J/ Y suppression § Hard probes: Medium response to strong interaction Jet quenching § Soft probes: Bulk properties of medium collective flow

Jets in high-energy collisions Uncorrelated jet model for hadron production: De Groot and Ruijgrok (1971) • Asymptotic freedom of QCD: Gross & Wilczek, Politzer (1973) • Partons in QCD: Ellis, Gaillard & Ross (1976), Georgi & Machacek (1977) • Jets in QCD: Sterman & Weinberg (1977) • --tools for studying QCD and new discoveries S Bethke J. Phys. G26 (2000) R27 7

Jets in heavy-ion collisions Multiple scattering Transverse momentum broadening Jet 1 q q Parton energy loss Jet suppression Jet 2 8

Hard and soft probes Pb-Pb pp reference soft probes hard probes 9

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